public virtual SqlExpression Translate(
SqlExpression instance,
MemberInfo member,
System.Type returnType)
{
var declaringType = member.DeclaringType;
if (declaringType == typeof(DateTime))
{
var memberName = member.Name;
if (s_datePartMapping.TryGetValue(memberName, out var datePart))
{
var extract = _sqlExpressionFactory.Function(
"EXTRACT",
new[] { new SpannerTimestampExtractExpression(_sqlExpressionFactory, instance, datePart) },
returnType);
if (datePart == "DAYOFWEEK")
{
// Cloud Spanner is 1-based, .NET is 0-based.
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Subtract(extract, _sqlExpressionFactory.Constant(1))));
}
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(extract));
}
}
return(null);
}
private SqlExpression TranslateIndexOf(
SqlExpression instance,
MethodInfo method,
SqlExpression searchExpression,
SqlExpression?startIndex)
{
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, searchExpression) !;
searchExpression = _sqlExpressionFactory.ApplyTypeMapping(searchExpression, stringTypeMapping);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
var charIndexArguments = new List <SqlExpression> {
searchExpression, instance
};
if (startIndex is not null)
{
charIndexArguments.Add(_sqlExpressionFactory.Add(startIndex, _sqlExpressionFactory.Constant(1)));
}
var argumentsPropagateNullability = Enumerable.Repeat(true, charIndexArguments.Count);
SqlExpression charIndexExpression;
var storeType = stringTypeMapping.StoreType;
if (string.Equals(storeType, "nvarchar(max)", StringComparison.OrdinalIgnoreCase) ||
string.Equals(storeType, "varchar(max)", StringComparison.OrdinalIgnoreCase))
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
charIndexArguments,
nullable: true,
argumentsPropagateNullability,
typeof(long));
charIndexExpression = _sqlExpressionFactory.Convert(charIndexExpression, typeof(int));
}
else
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
charIndexArguments,
nullable: true,
argumentsPropagateNullability,
method.ReturnType);
}
charIndexExpression = _sqlExpressionFactory.Subtract(charIndexExpression, _sqlExpressionFactory.Constant(1));
return(_sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
_sqlExpressionFactory.Equal(
searchExpression,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.Constant(0))
},
charIndexExpression));
}
public virtual SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType)
{
Check.NotNull(member, nameof(member));
Check.NotNull(returnType, nameof(returnType));
if (typeof(Polygon).IsAssignableFrom(member.DeclaringType))
{
Debug.Assert(instance.TypeMapping != null, "Instance must have typeMapping assigned.");
var storeType = instance.TypeMapping.StoreType;
var isGeography = string.Equals(storeType, "geography", StringComparison.OrdinalIgnoreCase);
if (isGeography)
{
if (Equals(_exteriorRing, member))
{
return(_sqlExpressionFactory.Function(
instance,
"RingN",
new[] { _sqlExpressionFactory.Constant(1) },
returnType,
_typeMappingSource.FindMapping(returnType, storeType)));
}
if (Equals(_numInteriorRings, member))
{
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
instance,
"NumRings",
Array.Empty <SqlExpression>(),
returnType),
_sqlExpressionFactory.Constant(1)));
}
}
if (_geometryMemberToFunctionName.TryGetValue(member, out var functionName))
{
var resultTypeMapping = typeof(Geometry).IsAssignableFrom(returnType)
? _typeMappingSource.FindMapping(returnType, storeType)
: _typeMappingSource.FindMapping(returnType);
return(_sqlExpressionFactory.Function(
instance,
functionName,
Array.Empty <SqlExpression>(),
returnType,
resultTypeMapping));
}
}
return(null);
}
public virtual SqlExpression?Translate(
SqlExpression?instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
Check.NotNull(logger, nameof(logger));
if (instance != null)
{
if (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"instr",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true },
method.ReturnType),
_sqlExpressionFactory.Constant(1)));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
return(_sqlExpressionFactory.Function(
"replace",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "lower" : "upper",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"substr",
new[] { instance, _sqlExpressionFactory.Add(arguments[0], _sqlExpressionFactory.Constant(1)), arguments[1] },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
instance.TypeMapping));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
_trimStartMethodInfoWithCharArg?.Equals(method) == true ||
_trimStartMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "ltrim"));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
_trimEndMethodInfoWithCharArg?.Equals(method) == true ||
_trimEndMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "rtrim"));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
_trimMethodInfoWithCharArg?.Equals(method) == true ||
_trimMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "trim"));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"instr",
new[] { instance, pattern },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"trim",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty))));
}
if (_firstOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[] { argument, _sqlExpressionFactory.Constant(1), _sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_lastOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[]
{
argument,
_sqlExpressionFactory.Function(
"length",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(int)),
_sqlExpressionFactory.Constant(1)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
return(null);
}
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
argument = _sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping);
var charIndexExpression = _sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
method.ReturnType),
_sqlExpressionFactory.Constant(1));
return(_sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
_sqlExpressionFactory.Equal(
argument,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.Constant(0))
},
charIndexExpression));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
firstArgument = _sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping);
secondArgument = _sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping);
return(_sqlExpressionFactory.Function(
"REPLACE",
new[] { instance, firstArgument, secondArgument },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "LOWER" : "UPPER",
new[] { instance },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[]
{
instance,
_sqlExpressionFactory.Add(
arguments[0],
_sqlExpressionFactory.Constant(1)),
arguments[1]
},
method.ReturnType,
instance.TypeMapping));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { argument },
argument.Type,
argument.TypeMapping)
},
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimStartMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[] { instance },
instance.Type,
instance.TypeMapping));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimEndMethodInfoWithCharArrayArg.Equals(method)
// SqlServer RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
instance.Type,
instance.TypeMapping));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM/RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
instance.Type,
instance.TypeMapping)
},
instance.Type,
instance.TypeMapping));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
if (pattern is SqlConstantExpression constantPattern)
{
if ((string)constantPattern.Value == string.Empty)
{
return(_sqlExpressionFactory.Constant(true));
}
return(_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
typeof(int)),
_sqlExpressionFactory.Constant(0)));
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
public virtual SqlExpression?Translate(
SqlExpression?instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
Check.NotNull(logger, nameof(logger));
if (instance != null)
{
if (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument) !;
argument = _sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping);
SqlExpression charIndexExpression;
var storeType = stringTypeMapping.StoreType;
if (string.Equals(storeType, "nvarchar(max)", StringComparison.OrdinalIgnoreCase) ||
string.Equals(storeType, "varchar(max)", StringComparison.OrdinalIgnoreCase))
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(long));
charIndexExpression = _sqlExpressionFactory.Convert(charIndexExpression, typeof(int));
}
else
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
method.ReturnType);
}
charIndexExpression = _sqlExpressionFactory.Subtract(charIndexExpression, _sqlExpressionFactory.Constant(1));
return(_sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
_sqlExpressionFactory.Equal(
argument,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.Constant(0))
},
charIndexExpression));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
firstArgument = _sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping);
secondArgument = _sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping);
return(_sqlExpressionFactory.Function(
"REPLACE",
new[] { instance, firstArgument, secondArgument },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "LOWER" : "UPPER",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[]
{
instance,
_sqlExpressionFactory.Add(
arguments[0],
_sqlExpressionFactory.Constant(1)),
arguments[1]
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
instance.TypeMapping));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimStartMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimEndMethodInfoWithCharArrayArg.Equals(method)
// SqlServer RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM/RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
if (pattern is SqlConstantExpression constantPattern)
{
if (!(constantPattern.Value is string patternValue))
{
return(_sqlExpressionFactory.Like(
instance,
_sqlExpressionFactory.Constant(null, stringTypeMapping)));
}
if (patternValue.Length == 0)
{
return(_sqlExpressionFactory.Constant(true));
}
return(patternValue.Any(IsLikeWildChar)
? _sqlExpressionFactory.Like(
instance,
_sqlExpressionFactory.Constant($"%{EscapeLikePattern(patternValue)}%"),
_sqlExpressionFactory.Constant(LikeEscapeString))
: _sqlExpressionFactory.Like(instance, _sqlExpressionFactory.Constant($"%{patternValue}%")));
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Like(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
}
if (_isNullOrEmptyMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Like(
argument,
_sqlExpressionFactory.Constant(string.Empty))));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
argument,
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
if (_firstOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[] { argument, _sqlExpressionFactory.Constant(1), _sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_lastOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[]
{
argument,
_sqlExpressionFactory.Function(
"LEN",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(int)),
_sqlExpressionFactory.Constant(1)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
return(null);
}
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (s_containsMethodInfo.Equals(method))
{
var pos = TranslateOneArgFunction("STRPOS", instance, arguments[0], typeof(long));
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.GreaterThan(pos, _sqlExpressionFactory.Constant(0L))));
}
if (s_startsWithMethodInfo.Equals(method))
{
return(TranslateOneArgFunction("STARTS_WITH", instance, arguments[0], typeof(bool)));
}
if (s_endsWithMethodInfo.Equals(method))
{
return(TranslateOneArgFunction("ENDS_WITH", instance, arguments[0], typeof(bool)));
}
if (s_indexOfMethodInfo.Equals(method))
{
var pos = TranslateOneArgFunction("STRPOS", instance, arguments[0], typeof(long));
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Subtract(pos, _sqlExpressionFactory.Constant(1L))));
}
if (s_replaceMethodInfo.Equals(method))
{
return(TranslateTwoArgFunction("REPLACE", instance, arguments[0], arguments[1], typeof(string)));
}
if (s_toLowerMethodInfo.Equals(method))
{
return(TranslateNoArgFunction("LOWER", instance, typeof(string)));
}
if (s_toUpperMethodInfo.Equals(method))
{
return(TranslateNoArgFunction("UPPER", instance, typeof(string)));
}
if (s_substringMethodInfo.Equals(method))
{
return(TranslateOneArgFunction("SUBSTR", instance, _sqlExpressionFactory.Add(arguments[0], _sqlExpressionFactory.Constant(1L)), typeof(string)));
}
if (s_substringWithLengthMethodInfo.Equals(method))
{
return(TranslateTwoArgFunction("SUBSTR", instance, _sqlExpressionFactory.Add(arguments[0], _sqlExpressionFactory.Constant(1L)), arguments[1], typeof(string)));
}
if (s_trimStartMethodInfoWithoutArgs.Equals(method))
{
return(TranslateNoArgFunction("LTRIM", instance, typeof(string)));
}
if (s_trimStartMethodInfoWithCharArg.Equals(method))
{
return(TranslateOneArgFunction("LTRIM", instance, arguments[0], typeof(string)));
}
if (s_trimEndMethodInfoWithoutArgs.Equals(method))
{
return(TranslateNoArgFunction("RTRIM", instance, typeof(string)));
}
if (s_trimEndMethodInfoWithCharArg.Equals(method))
{
return(TranslateOneArgFunction("RTRIM", instance, arguments[0], typeof(string)));
}
if (s_trimMethodInfoWithoutArgs.Equals(method))
{
return(TranslateNoArgFunction("TRIM", instance, typeof(string)));
}
if (s_trimMethodInfoWithCharArg.Equals(method))
{
return(TranslateOneArgFunction("TRIM", instance, arguments[0], typeof(string)));
}
if (s_padLeftMethodInfo.Equals(method))
{
return(TranslateOneArgFunction("LPAD", instance, arguments[0], typeof(string)));
}
if (s_padLeftWithStringMethodInfo.Equals(method))
{
return(TranslateTwoArgFunction("LPAD", instance, arguments[0], arguments[1], typeof(string)));
}
if (s_padRightMethodInfo.Equals(method))
{
return(TranslateOneArgFunction("RPAD", instance, arguments[0], typeof(string)));
}
if (s_padRightWithStringMethodInfo.Equals(method))
{
return(TranslateTwoArgFunction("RPAD", instance, arguments[0], arguments[1], typeof(string)));
}
if (s_formatOneArgMethodInfo.Equals(method) || s_formatTwoArgMethodInfo.Equals(method) || s_formatThreeArgMethodInfo.Equals(method) || s_formatVarArgMethodInfo.Equals(method))
{
return(TranslateStaticFunction("FORMAT", arguments, typeof(string)));
}
if (s_joinMethodInfo.Equals(method))
{
return(TranslateTwoArgFunction("ARRAY_TO_STRING", arguments[1], arguments[0], _sqlExpressionFactory.Constant(""), typeof(string)));
}
return(null);
}
public virtual SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType)
{
Check.NotNull(member, nameof(member));
Check.NotNull(returnType, nameof(returnType));
if (member.DeclaringType == typeof(DateTime))
{
var memberName = member.Name;
if (_datePartMapping.TryGetValue(memberName, out var datePart))
{
return(_sqlExpressionFactory.Convert(
SqliteExpression.Strftime(
_sqlExpressionFactory,
typeof(string),
datePart,
instance),
returnType));
}
if (string.Equals(memberName, nameof(DateTime.Ticks)))
{
return(_sqlExpressionFactory.Convert(
_sqlExpressionFactory.Multiply(
_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"julianday",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(double)),
_sqlExpressionFactory.Constant(1721425.5)), // NB: Result of julianday('0001-01-01 00:00:00')
_sqlExpressionFactory.Constant(TimeSpan.TicksPerDay)),
typeof(long)));
}
if (string.Equals(memberName, nameof(DateTime.Millisecond)))
{
return(_sqlExpressionFactory.Modulo(
_sqlExpressionFactory.Multiply(
_sqlExpressionFactory.Convert(
SqliteExpression.Strftime(
_sqlExpressionFactory,
typeof(string),
"%f",
instance),
typeof(double)),
_sqlExpressionFactory.Constant(1000)),
_sqlExpressionFactory.Constant(1000)));
}
var format = "%Y-%m-%d %H:%M:%f";
SqlExpression timestring;
var modifiers = new List <SqlExpression>();
switch (memberName)
{
case nameof(DateTime.Now):
timestring = _sqlExpressionFactory.Constant("now");
modifiers.Add(_sqlExpressionFactory.Constant("localtime"));
break;
case nameof(DateTime.UtcNow):
timestring = _sqlExpressionFactory.Constant("now");
break;
case nameof(DateTime.Date):
timestring = instance;
modifiers.Add(_sqlExpressionFactory.Constant("start of day"));
break;
case nameof(DateTime.Today):
timestring = _sqlExpressionFactory.Constant("now");
modifiers.Add(_sqlExpressionFactory.Constant("localtime"));
modifiers.Add(_sqlExpressionFactory.Constant("start of day"));
break;
case nameof(DateTime.TimeOfDay):
format = "%H:%M:%f";
timestring = instance;
break;
default:
return(null);
}
Check.DebugAssert(timestring != null, "timestring is null");
return(_sqlExpressionFactory.Function(
"rtrim",
new SqlExpression[]
{
_sqlExpressionFactory.Function(
"rtrim",
new SqlExpression[]
{
SqliteExpression.Strftime(
_sqlExpressionFactory,
returnType,
format,
timestring,
modifiers),
_sqlExpressionFactory.Constant("0")
},
nullable: true,
argumentsPropagateNullability: new[] { true, false },
returnType),
_sqlExpressionFactory.Constant(".")
},
nullable: true,
argumentsPropagateNullability: new[] { true, false },
returnType));
}
return(null);
}
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
if (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
argument = _sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping);
SqlExpression charIndexExpression;
var storeType = stringTypeMapping.StoreType;
if (string.Equals(storeType, "nvarchar(max)", StringComparison.OrdinalIgnoreCase) ||
string.Equals(storeType, "varchar(max)", StringComparison.OrdinalIgnoreCase))
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new [] { true, true },
typeof(long));
charIndexExpression = _sqlExpressionFactory.Convert(charIndexExpression, typeof(int));
}
else
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
method.ReturnType);
}
charIndexExpression = _sqlExpressionFactory.Subtract(charIndexExpression, _sqlExpressionFactory.Constant(1));
return(_sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
_sqlExpressionFactory.Equal(
argument,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.Constant(0))
},
charIndexExpression));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
firstArgument = _sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping);
secondArgument = _sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping);
return(_sqlExpressionFactory.Function(
"REPLACE",
new[] { instance, firstArgument, secondArgument },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "LOWER" : "UPPER",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[]
{
instance,
_sqlExpressionFactory.Add(
arguments[0],
_sqlExpressionFactory.Constant(1)),
arguments[1]
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
instance.TypeMapping));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimStartMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimEndMethodInfoWithCharArrayArg.Equals(method)
// SqlServer RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM/RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
if (pattern is SqlConstantExpression constantPattern)
{
// Intentionally string.Empty since we don't want to match nulls here.
#pragma warning disable CA1820 // Test for empty strings using string length
if ((string)constantPattern.Value == string.Empty)
#pragma warning restore CA1820 // Test for empty strings using string length
{
return(_sqlExpressionFactory.Constant(true));
}
return(_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0)));
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
public virtual SqlExpression Translate(
SqlExpression instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (method == IndexOfString || method == IndexOfChar)
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"strpos",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: TrueArrays[2],
method.ReturnType),
_sqlExpressionFactory.Constant(1)));
}
if (method == Replace)
{
var oldValue = arguments[0];
var newValue = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, oldValue, newValue);
return(_sqlExpressionFactory.Function(
"replace",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(oldValue, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(newValue, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: TrueArrays[3],
method.ReturnType,
stringTypeMapping));
}
if (method == ToLower || method == ToUpper)
{
return(_sqlExpressionFactory.Function(
method == ToLower ? "lower" : "upper",
new[] { instance },
nullable: true,
argumentsPropagateNullability: TrueArrays[1],
method.ReturnType,
instance.TypeMapping));
}
if (method == Substring || method == SubstringWithLength)
{
var args =
method == Substring
? new[] { instance, GenerateOneBasedIndexExpression(arguments[0]) }
: new[] { instance, GenerateOneBasedIndexExpression(arguments[0]), arguments[1] };
return(_sqlExpressionFactory.Function(
"substring",
args,
nullable: true,
argumentsPropagateNullability: TrueArrays[args.Length],
method.ReturnType,
instance.TypeMapping));
}
if (method == IsNullOrWhiteSpace)
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"btrim",
new[]
{
argument,
_whitespace
},
nullable: true,
argumentsPropagateNullability: TrueArrays[2],
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
var isTrimStart = method == TrimStartWithNoParam || method == TrimStartWithChars || method == TrimStartWithSingleChar;
var isTrimEnd = method == TrimEndWithNoParam || method == TrimEndWithChars || method == TrimEndWithSingleChar;
var isTrimBoth = method == TrimBothWithNoParam || method == TrimBothWithChars || method == TrimBothWithSingleChar;
if (isTrimStart || isTrimEnd || isTrimBoth)
{
char[] trimChars = null;
if (method == TrimStartWithChars || method == TrimStartWithSingleChar ||
method == TrimEndWithChars || method == TrimEndWithSingleChar ||
method == TrimBothWithChars || method == TrimBothWithSingleChar)
{
var constantTrimChars = arguments[0] as SqlConstantExpression;
if (constantTrimChars == null)
{
return(null); // Don't translate if trim chars isn't a constant
}
trimChars = constantTrimChars.Value is char c
? new[] { c }
: (char[])constantTrimChars.Value;
}
return(_sqlExpressionFactory.Function(
isTrimStart ? "ltrim" : isTrimEnd ? "rtrim" : "btrim",
new[]
{
instance,
trimChars == null || trimChars.Length == 0
? _whitespace
: _sqlExpressionFactory.Constant(new string(trimChars))
},
nullable: true,
argumentsPropagateNullability: TrueArrays[2],
instance.Type,
instance.TypeMapping));
}
if (method == Contains)
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
var strposCheck = _sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"strpos",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: TrueArrays[2],
typeof(int)),
_sqlExpressionFactory.Constant(0));
if (pattern is SqlConstantExpression constantPattern)
{
return((string)constantPattern.Value == string.Empty
? (SqlExpression)_sqlExpressionFactory.Constant(true)
: strposCheck);
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
strposCheck));
}
if (method == PadLeft || method == PadLeftWithChar || method == PadRight || method == PadRightWithChar)
{
var args =
method == PadLeft || method == PadRight
? new[] { instance, arguments[0] }
: new[] { instance, arguments[0], arguments[1] };
return(_sqlExpressionFactory.Function(
method == PadLeft || method == PadLeftWithChar ? "lpad" : "rpad",
args,
nullable: true,
argumentsPropagateNullability: TrueArrays[args.Length],
instance.Type,
instance.TypeMapping));
}
if (method == FirstOrDefaultMethodInfoWithoutArgs)
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[] { argument, _sqlExpressionFactory.Constant(1), _sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: TrueArrays[3],
method.ReturnType));
}
if (method == LastOrDefaultMethodInfoWithoutArgs)
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[]
{
argument,
_sqlExpressionFactory.Function(
"length",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(int)),
_sqlExpressionFactory.Constant(1)
},
nullable: true,
argumentsPropagateNullability: TrueArrays[3],
method.ReturnType));
}
if (method == DbFunctionsReverse)
{
return(_sqlExpressionFactory.Function(
"reverse",
new[] { arguments[1] },
nullable: true,
argumentsPropagateNullability: TrueArrays[1],
typeof(string),
arguments[1].TypeMapping));
}
if (method == StartsWith)
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (method == EndsWith)
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual SqlExpression?Translate(
SqlExpression?instance,
MemberInfo member,
Type returnType,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (typeof(Polygon).IsAssignableFrom(member.DeclaringType))
{
Check.DebugAssert(instance !.TypeMapping != null, "Instance must have typeMapping assigned.");
var storeType = instance.TypeMapping.StoreType;
var isGeography = string.Equals(storeType, "geography", StringComparison.OrdinalIgnoreCase);
if (isGeography)
{
if (Equals(ExteriorRing, member))
{
return(_sqlExpressionFactory.Function(
instance,
"RingN",
new[] { _sqlExpressionFactory.Constant(1) },
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability: new[] { false },
returnType,
_typeMappingSource.FindMapping(returnType, storeType)));
}
if (Equals(NumInteriorRings, member))
{
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
instance,
"NumRings",
Array.Empty <SqlExpression>(),
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability: Array.Empty <bool>(),
returnType),
_sqlExpressionFactory.Constant(1)));
}
}
if (GeometryMemberToFunctionName.TryGetValue(member, out var functionName))
{
var resultTypeMapping = typeof(Geometry).IsAssignableFrom(returnType)
? _typeMappingSource.FindMapping(returnType, storeType)
: _typeMappingSource.FindMapping(returnType);
return(_sqlExpressionFactory.Function(
instance,
functionName,
Array.Empty <SqlExpression>(),
nullable: true,
instancePropagatesNullability: true,
argumentsPropagateNullability: Array.Empty <bool>(),
returnType,
resultTypeMapping));
}
}
return(null);
}
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"instr",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping)
}, true, null,
method.ReturnType),
_sqlExpressionFactory.Constant(1)));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
return(_sqlExpressionFactory.Function(
"replace",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping)
}, true, null,
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "lower" : "upper",
new[] { instance }, true, null,
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"substr",
new[] { instance, _sqlExpressionFactory.Add(arguments[0], _sqlExpressionFactory.Constant(1)), arguments[1] }, true, null,
method.ReturnType,
instance.TypeMapping));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"trim", new[] { argument }, true, null, argument.Type, argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty))));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
_trimStartMethodInfoWithCharArg?.Equals(method) == true ||
_trimStartMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "ltrim"));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
_trimEndMethodInfoWithCharArg?.Equals(method) == true ||
_trimEndMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "rtrim"));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
_trimMethodInfoWithCharArg?.Equals(method) == true ||
_trimMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "trim"));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"instr",
new[] { instance, pattern }, true, null,
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (method == IndexOfString || method == IndexOfChar)
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"STRPOS",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping)
},
method.ReturnType),
_sqlExpressionFactory.Constant(1)));
}
if (method == Replace)
{
var oldValue = arguments[0];
var newValue = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, oldValue, newValue);
return(_sqlExpressionFactory.Function(
"REPLACE",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(oldValue, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(newValue, stringTypeMapping)
},
method.ReturnType,
stringTypeMapping));
}
if (method == ToLower || method == ToUpper)
{
return(_sqlExpressionFactory.Function(
method == ToLower ? "LOWER" : "UPPER",
new[] { instance },
method.ReturnType,
instance.TypeMapping));
}
if (method == Substring || method == SubstringWithLength)
{
var args =
method == Substring
? new[] { instance, GenerateOneBasedIndexExpression(arguments[0]) }
: new[] { instance, GenerateOneBasedIndexExpression(arguments[0]), arguments[1] };
return(_sqlExpressionFactory.Function(
"SUBSTRING",
args,
method.ReturnType,
instance.TypeMapping));
}
if (method == IsNullOrWhiteSpace)
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"BTRIM",
new[]
{
argument,
_whitespace
},
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
var isTrimStart = method == TrimStartWithNoParam || method == TrimStartWithChars || method == TrimStartWithSingleChar;
var isTrimEnd = method == TrimEndWithNoParam || method == TrimEndWithChars || method == TrimEndWithSingleChar;
var isTrimBoth = method == TrimBothWithNoParam || method == TrimBothWithChars || method == TrimBothWithSingleChar;
if (isTrimStart || isTrimEnd || isTrimBoth)
{
char[] trimChars = null;
if (method == TrimStartWithChars || method == TrimStartWithSingleChar ||
method == TrimEndWithChars || method == TrimEndWithSingleChar ||
method == TrimBothWithChars || method == TrimBothWithSingleChar)
{
var constantTrimChars = arguments[0] as SqlConstantExpression;
if (constantTrimChars == null)
{
return(null); // Don't translate if trim chars isn't a constant
}
trimChars = constantTrimChars.Value is char c
? new[] { c }
: (char[])constantTrimChars.Value;
}
return(_sqlExpressionFactory.Function(
isTrimStart ? "LTRIM" : isTrimEnd ? "RTRIM" : "BTRIM",
new[]
{
instance,
trimChars == null || trimChars.Length == 0
? _whitespace
: _sqlExpressionFactory.Constant(new string(trimChars))
},
instance.Type,
instance.TypeMapping));
}
if (method == Contains)
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
var strposCheck = _sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"STRPOS",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping)
},
typeof(int)),
_sqlExpressionFactory.Constant(0));
if (pattern is SqlConstantExpression constantPattern)
{
return((string)constantPattern.Value == string.Empty
? (SqlExpression)_sqlExpressionFactory.Constant(true)
: strposCheck);
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
strposCheck));
}
if (method == PadLeft || method == PadLeftWithChar || method == PadRight || method == PadRightWithChar)
{
var args =
method == PadLeft || method == PadRight
? new[] { instance, arguments[0] }
: new[] { instance, arguments[0], arguments[1] };
return(_sqlExpressionFactory.Function(
method == PadLeft || method == PadLeftWithChar ? "lpad" : "rpad",
args,
instance.Type,
instance.TypeMapping));
}
if (method == StartsWith)
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (method == EndsWith)
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
private static SqlExpression GetAndoyerDistance(
SqlExpression left,
SqlExpression right,
Type resultType,
ISqlExpressionFactory sqlExpressionFactory)
{
SqlExpression toDegrees(SqlExpression coord)
=> sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
coord,
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0));
SqlExpression xCoord(SqlExpression point)
=> sqlExpressionFactory.Function(
"ST_X",
new[] { point },
resultType);
SqlExpression yCoord(SqlExpression point)
=> sqlExpressionFactory.Function(
"ST_Y",
new[] { point },
resultType);
var c0 = sqlExpressionFactory.Constant(0.0);
var c1 = sqlExpressionFactory.Constant(1.0);
var c2 = sqlExpressionFactory.Constant(2.0);
var c3 = sqlExpressionFactory.Constant(3.0);
var c2Int = sqlExpressionFactory.Constant(2);
var lon1 = toDegrees(xCoord(left));
var lat1 = toDegrees(yCoord(left));
var lon2 = toDegrees(xCoord(right));
var lat2 = toDegrees(yCoord(right));
var g = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(
lat1,
lat2),
c2);
var lambda = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(
lon1,
lon2),
c2);
var f = sqlExpressionFactory.Divide(
sqlExpressionFactory.Add(
lat1,
lat2),
c2);
var sinG2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { g },
resultType),
c2Int
},
resultType);
var cosG2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { g },
resultType),
c2Int
},
resultType);
var sinF2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { f },
resultType),
c2Int
},
resultType);
var cosF2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { f },
resultType),
c2Int
},
resultType);
var sinL2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { lambda },
resultType),
c2Int
},
resultType);
var cosL2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { lambda },
resultType),
c2Int
},
resultType);
var s = sqlExpressionFactory.Add(
sqlExpressionFactory.Multiply(sinG2, cosL2),
sqlExpressionFactory.Multiply(cosF2, sinL2));
var c = sqlExpressionFactory.Add(
sqlExpressionFactory.Multiply(cosG2, cosL2),
sqlExpressionFactory.Multiply(sinF2, sinL2));
var radiusA = sqlExpressionFactory.Constant(6378137.0);
var radiusB = sqlExpressionFactory.Constant(6356752.3142451793);
var flattening = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(radiusA, radiusB),
radiusA);
var omega = sqlExpressionFactory.Function(
"ATAN",
new[]
{
sqlExpressionFactory.Function(
"SQRT",
new[] { sqlExpressionFactory.Divide(s, c) },
resultType)
},
resultType);
var r3 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
c3,
sqlExpressionFactory.Function(
"SQRT",
new[] { sqlExpressionFactory.Multiply(s, c) },
resultType)),
omega);
var d = sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(c2, omega),
radiusA);
var h1 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(r3, c1),
sqlExpressionFactory.Multiply(c2, c));
var h2 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Add(r3, c1),
sqlExpressionFactory.Multiply(c2, s));
var andoyer = sqlExpressionFactory.Multiply(
d,
sqlExpressionFactory.Add(
c1,
sqlExpressionFactory.Multiply(
flattening,
sqlExpressionFactory.Subtract(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(
h1,
sinF2),
cosG2),
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(
h2,
cosF2),
sinG2)))));
return(sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
sqlExpressionFactory.OrElse(
sqlExpressionFactory.OrElse(
sqlExpressionFactory.AndAlso(
sqlExpressionFactory.Equal(lambda, c0),
sqlExpressionFactory.Equal(g, c0)),
sqlExpressionFactory.Equal(s, c0)),
sqlExpressionFactory.Equal(c, c0)),
c0),
},
andoyer));
}
private static SqlExpression GetHaversineDistance(
SqlExpression left,
SqlExpression right,
Type resultType,
ISqlExpressionFactory sqlExpressionFactory)
{
// HAVERSINE = 6371000 * 2 * ASIN(
// SQRT(
// POWER(SIN((ST_Y(pt2) - ST_Y(pt1)) * pi()/180 / 2), 2) +
// COS(ST_Y(pt1) * pi()/180) *
// COS(ST_Y(pt2) * pi()/180) *
// POWER(SIN((ST_X(pt2) - ST_X(pt1)) * pi()/180 / 2), 2)
// )
// )
return(sqlExpressionFactory.Multiply(
sqlExpressionFactory.Constant(6370986.0), // see https://postgis.net/docs/manual-1.4/ST_Distance_Sphere.html
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Constant(2.0),
sqlExpressionFactory.Function(
"ASIN",
new[]
{
sqlExpressionFactory.Function(
"SQRT",
new[]
{
sqlExpressionFactory.Add(
sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[]
{
sqlExpressionFactory.Divide(
sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Subtract(
sqlExpressionFactory.Function(
"ST_Y",
new[] { right },
resultType),
sqlExpressionFactory.Function(
"ST_Y",
new[] { left },
resultType)),
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0)),
sqlExpressionFactory.Constant(2.0))
},
resultType),
sqlExpressionFactory.Constant(2),
},
resultType),
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Function(
"COS",
new[]
{
sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Function(
"ST_Y",
new[] { left },
resultType),
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0)),
},
resultType),
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Function(
"COS",
new[]
{
sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Function(
"ST_Y",
new[] { right },
resultType),
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0)),
},
resultType),
sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[]
{
sqlExpressionFactory.Divide(
sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Subtract(
sqlExpressionFactory.Function(
"ST_X",
new[] { right },
resultType),
sqlExpressionFactory.Function(
"ST_X",
new[] { left },
resultType)),
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0)),
sqlExpressionFactory.Constant(2.0))
},
resultType),
sqlExpressionFactory.Constant(2),
},
resultType))))
},
resultType)
},
resultType))));
}