public SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType, IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (member.DeclaringType == typeof(DateTime) && member.Name == nameof(DateTime.Date))
{
return(_fbSqlExpressionFactory.SpacedFunction(
"CAST",
new[] { instance, _fbSqlExpressionFactory.Fragment("AS"), _fbSqlExpressionFactory.Fragment("DATE") },
true,
new[] { true, false, false },
typeof(DateTime)));
}
return(null);
}
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments, IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (!TryGetTrimDefinition(instance, method, arguments, out var trimArguments, out var nullability))
{
return(null);
}
return(_fbSqlExpressionFactory.SpacedFunction(
"TRIM",
trimArguments,
true,
nullability,
typeof(string)));
}
public SqlExpression Translate(SqlExpression instance, MemberInfo member, Type returnType, IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (!MemberMapping.TryGetValue(member, out var part))
{
return(null);
}
var result = (SqlExpression)_fbSqlExpressionFactory.SpacedFunction(
"EXTRACT",
new[] { _fbSqlExpressionFactory.Fragment(part), _fbSqlExpressionFactory.Fragment("FROM"), instance },
true,
new[] { false, false, true },
typeof(int));
if (part == SecondPart || part == MillisecondPart)
{
result = _fbSqlExpressionFactory.Function("TRUNC", new[] { result }, true, new[] { true }, typeof(int));
}
return(result);
}
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments, IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
if (!(method.Equals(SubstringOnlyStartMethod) || method.Equals(SubstringStartAndLengthMethod)))
{
return(null);
}
var fromExpression = _fbSqlExpressionFactory.ApplyDefaultTypeMapping(_fbSqlExpressionFactory.Add(arguments[0], _fbSqlExpressionFactory.Constant(1)));
var forExpression = arguments.Count == 2 ? _fbSqlExpressionFactory.ApplyDefaultTypeMapping(arguments[1]) : null;
var substringArguments = forExpression != null
? new[] { instance, _fbSqlExpressionFactory.Fragment("FROM"), fromExpression, _fbSqlExpressionFactory.Fragment("FOR"), forExpression }
: new[] { instance, _fbSqlExpressionFactory.Fragment("FROM"), fromExpression };
var nullability = forExpression != null
? new[] { true, false, true, false, true }
: new[] { true, false, true };
return(_fbSqlExpressionFactory.SpacedFunction(
"SUBSTRING",
substringArguments,
true,
nullability,
typeof(string)));
}