private SqlBinaryExpression MakeStartsWithExpressionImpl( SqlExpression target, SqlExpression prefix, SqlExpression originalPrefix = null) { // BUG: EF Core #17389 will lead to a System.NullReferenceException, if SqlExpressionFactory.Like() // is being called with match and pattern as two expressions, that have not been applied a // TypeMapping yet and no escapeChar (null). // As a workaround, apply/infer the type mapping for the match expression manually for now. return(_sqlExpressionFactory.AndAlso( _sqlExpressionFactory.Like( target, _sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Function( "CONCAT", // when performing the like it is preferable to use the untransformed prefix // value to ensure the index can be used new[] { originalPrefix ?? prefix, _sqlExpressionFactory.Constant("%") }, typeof(string)))), _sqlExpressionFactory.Equal( _sqlExpressionFactory.Function( "LEFT", new[] { target, CharLength(prefix) }, typeof(string)), prefix ))); }
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments) { if (method.DeclaringType != typeof(JsonElement) || !(instance.TypeMapping is MySqlJsonTypeMapping mapping)) { return(null); } // The root of the JSON expression is a ColumnExpression. We wrap that with an empty traversal // expression (col->'$'); subsequent traversals will gradually append the path into that. // Note that it's possible to call methods such as GetString() directly on the root, and the // empty traversal is necessary to properly convert it to a text. instance = instance is ColumnExpression columnExpression ? _sqlExpressionFactory.JsonTraversal( columnExpression, returnsText : false, typeof(string), mapping) : instance; if (method == _getProperty) { return(instance is MySqlJsonTraversalExpression prevPathTraversal ? prevPathTraversal.Append( ApplyPathLocationTypeMapping(arguments[0]), typeof(JsonElement), _typeMappingSource.FindMapping(typeof(JsonElement))) : null); } if (method == _arrayIndexer) { return(instance is MySqlJsonTraversalExpression prevPathTraversal ? prevPathTraversal.Append( _sqlExpressionFactory.JsonArrayIndex(ApplyPathLocationTypeMapping(arguments[0])), typeof(JsonElement), _typeMappingSource.FindMapping(typeof(JsonElement))) : null); } if (_getMethods.Contains(method.Name) && arguments.Count == 0 && instance is MySqlJsonTraversalExpression traversal) { return(ConvertFromJsonExtract( traversal.Clone( method.Name == nameof(JsonElement.GetString), method.ReturnType, _typeMappingSource.FindMapping(method.ReturnType) ), method.ReturnType)); } if (method == _getArrayLength) { return(_sqlExpressionFactory.Function( "JSON_LENGTH", new[] { instance }, typeof(int))); } if (method.Name.StartsWith("TryGet") && arguments.Count == 0) { throw new InvalidOperationException($"The TryGet* methods on {nameof(JsonElement)} aren't translated yet, use Get* instead.'"); } return(null); }
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments) { if (method.DeclaringType != typeof(MySqlJsonDbFunctionsExtensions)) { return(null); } var args = arguments // Skip useless DbFunctions instance .Skip(1) // JSON extensions accept object parameters for JSON, since they must be able to handle POCOs, strings or DOM types. // This means they come wrapped in a convert node, which we need to remove. // Convert nodes may also come from wrapping JsonTraversalExpressions generated through POCO traversal. .Select(removeConvert) // CHECK: Either just not doing this it all is fine, or not applying it to JsonQuote and JsonUnquote // (as already implemented below) is needed. An alternative would be to move the check into the local // json() function. // // If a function is invoked over a JSON traversal expression, that expression may come with // returnText: true (i.e. operator ->> and not ->). Since the functions below require a json object and // not text, we transform it. // .Select( // a => a is MySqlJsonTraversalExpression traversal && // method.Name != nameof(MySqlJsonDbFunctionsExtensions.JsonQuote) && // method.Name != nameof(MySqlJsonDbFunctionsExtensions.JsonUnquote) // ? withReturnsText(traversal, false) // : a) .ToArray(); var result = method.Name switch { nameof(MySqlJsonDbFunctionsExtensions.AsJson) => _sqlExpressionFactory.ApplyTypeMapping( args[0], _sqlExpressionFactory.FindMapping(method.ReturnType, "json")), nameof(MySqlJsonDbFunctionsExtensions.JsonType) => _sqlExpressionFactory.Function( "JSON_TYPE", new[] { json(args[0]) }, typeof(string)), nameof(MySqlJsonDbFunctionsExtensions.JsonQuote) => _sqlExpressionFactory.Function( "JSON_QUOTE", new[] { args[0] }, method.ReturnType), nameof(MySqlJsonDbFunctionsExtensions.JsonUnquote) => _sqlExpressionFactory.Function( "JSON_UNQUOTE", new[] { args[0] }, method.ReturnType), nameof(MySqlJsonDbFunctionsExtensions.JsonExtract) => _sqlExpressionFactory.Function( "JSON_EXTRACT", Array.Empty <SqlExpression>() .Append(json(args[0])) .Concat(deconstructParamsArray(args[1])), method.ReturnType, _sqlExpressionFactory.FindMapping(method.ReturnType, "json")), nameof(MySqlJsonDbFunctionsExtensions.JsonContains) => _sqlExpressionFactory.Function( "JSON_CONTAINS", args.Length >= 3 ? new[] { json(args[0]), args[1], args[2] } : new[] { json(args[0]), args[1] }, typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPath) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", new[] { json(args[0]), _sqlExpressionFactory.Constant("one"), args[1] }, typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPathAny) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("one")) .Concat(deconstructParamsArray(args[1])), typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPathAll) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("all")) .Concat(deconstructParamsArray(args[1])), typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonSearchAny) => _sqlExpressionFactory.IsNotNull( _sqlExpressionFactory.Function( "JSON_SEARCH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("one")) .Append(args[1]) .AppendIfTrue(args.Length >= 3, () => args.Length >= 4 ? args[3] : _sqlExpressionFactory.Constant(null, RelationalTypeMapping.NullMapping)) .AppendIfTrue(args.Length >= 3, () => args[2]), typeof(bool))), nameof(MySqlJsonDbFunctionsExtensions.JsonSearchAll) => _sqlExpressionFactory.IsNotNull( _sqlExpressionFactory.Function( "JSON_SEARCH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("all")) .Append(args[1]) .AppendIfTrue(args.Length >= 3, () => args.Length >= 4 ? args[3] : _sqlExpressionFactory.Constant(null, RelationalTypeMapping.NullMapping)) .AppendIfTrue(args.Length >= 3, () => args[2]), typeof(bool))) as SqlExpression, _ => null }; return(result); SqlExpression json(SqlExpression e) => _sqlExpressionFactory.ApplyTypeMapping(ensureJson(e), _sqlExpressionFactory.FindMapping(e.Type, "json"));
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments) { if (method.DeclaringType != typeof(MySqlJsonDbFunctionsExtensions)) { return(null); } var args = arguments // Skip useless DbFunctions instance .Skip(1) // JSON extensions accept object parameters for JSON, since they must be able to handle POCOs, strings or DOM types. // This means they come wrapped in a convert node, which we need to remove. // Convert nodes may also come from wrapping JsonTraversalExpressions generated through POCO traversal. .Select(removeConvert) // If a function is invoked over a JSON traversal expression, that expression may come with // returnText: true (i.e. operator ->> and not ->). Since the functions below require a json object and // not text, we transform it. .Select(a => a is MySqlJsonTraversalExpression traversal ? withReturnsText(traversal, false) : a) .ToArray(); if (!args.Any(a => a.TypeMapping is MySqlJsonTypeMapping || a is MySqlJsonTraversalExpression)) { throw new InvalidOperationException("The EF JSON methods require a JSON parameter but none was found."); } var result = method.Name switch { nameof(MySqlJsonDbFunctionsExtensions.JsonType) => _sqlExpressionFactory.Function( "JSON_TYPE", new[] { args[0] }, typeof(string)), nameof(MySqlJsonDbFunctionsExtensions.JsonContains) => _sqlExpressionFactory.Function( "JSON_CONTAINS", args.Length >= 3 ? new[] { json(args[0]), args[1], args[2] } : new[] { json(args[0]), args[1] }, typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPath) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", new[] { json(args[0]), _sqlExpressionFactory.Constant("one"), args[1] }, typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPathAny) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("one")) .Concat(deconstructParamsArray(args[1])), typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonContainsPathAll) => _sqlExpressionFactory.Function( "JSON_CONTAINS_PATH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("all")) .Concat(deconstructParamsArray(args[1])), typeof(bool)), nameof(MySqlJsonDbFunctionsExtensions.JsonSearchAny) => _sqlExpressionFactory.IsNotNull( _sqlExpressionFactory.Function( "JSON_SEARCH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("one")) .Append(args[1]) .AppendIfTrue(args.Length >= 3, () => args.Length >= 4 ? args[3] : _sqlExpressionFactory.Constant(null, RelationalTypeMapping.NullMapping)) .AppendIfTrue(args.Length >= 3, () => args[2]), typeof(bool))), nameof(MySqlJsonDbFunctionsExtensions.JsonSearchAll) => _sqlExpressionFactory.IsNotNull( _sqlExpressionFactory.Function( "JSON_SEARCH", Array.Empty <SqlExpression>() .Append(json(args[0])) .Append(_sqlExpressionFactory.Constant("all")) .Append(args[1]) .AppendIfTrue(args.Length >= 3, () => args.Length >= 4 ? args[3] : _sqlExpressionFactory.Constant(null, RelationalTypeMapping.NullMapping)) .AppendIfTrue(args.Length >= 3, () => args[2]), typeof(bool))) as SqlExpression, _ => null }; return(result); SqlExpression json(SqlExpression e) => _sqlExpressionFactory.ApplyTypeMapping(e, _sqlExpressionFactory.FindMapping(e.Type, "json"));
/// <summary> /// This API supports the Entity Framework Core infrastructure and is not intended to be used /// directly from your code. This API may change or be removed in future releases. /// </summary> public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments) { if (_likeMethodInfos.Any(m => Equals(method, m))) { var match = _sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[1]); var pattern = InferStringTypeMappingOrApplyDefault( arguments[2], match.TypeMapping); var excapeChar = arguments.Count == 4 ? InferStringTypeMappingOrApplyDefault( arguments[3], match.TypeMapping) : null; return(_sqlExpressionFactory.Like( match, pattern, excapeChar)); } if (Equals(method, _matchMethodInfo)) { if (arguments[3] is SqlConstantExpression constant) { return(_sqlExpressionFactory.MakeMatch( arguments[1], arguments[2], (MySqlMatchSearchMode)constant.Value)); } if (arguments[3] is SqlParameterExpression parameter) { // Use nested OR clauses here, because MariaDB does not support MATCH...AGAINST from inside of // CASE statements and the nested OR clauses use the fulltext index, while using CASE does not: // <search_mode_1> = @p AND MATCH ... AGAINST ... OR // <search_mode_2> = @p AND MATCH ... AGAINST ... OR [...] var andClauses = Enum.GetValues(typeof(MySqlMatchSearchMode)) .Cast <MySqlMatchSearchMode>() .OrderByDescending(m => m) .Select(m => _sqlExpressionFactory.AndAlso( _sqlExpressionFactory.Equal(parameter, _sqlExpressionFactory.Constant(m)), _sqlExpressionFactory.MakeMatch(arguments[1], arguments[2], m))) .ToArray(); return(andClauses .Skip(1) .Aggregate( andClauses.First(), (currentAnd, previousExpression) => _sqlExpressionFactory.OrElse(previousExpression, currentAnd))); } } if (_hexMethodInfos.Any(m => Equals(method, m))) { return(_sqlExpressionFactory.Function( "HEX", new[] { arguments[1] }, typeof(string))); } if (method == _unhexMethodInfo) { return(_sqlExpressionFactory.Function( "UNHEX", new[] { arguments[1] }, typeof(string))); } return(null); }
/// <summary> /// This API supports the Entity Framework Core infrastructure and is not intended to be used /// directly from your code. This API may change or be removed in future releases. /// </summary> public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments) { if (Equals(method, _spatialDistancePlanarMethodInfo)) { // MySQL 8 uses the Andoyer algorithm by default for `ST_Distance()`, if an SRID of 4326 has been // associated with the geometry. // Since this call explicitly asked for a planar distance calculation, we need to ensure that // MySQL actually does that. // MariaDB ignores SRIDs and always calculates the planar distance. // CHECK: It could be faster to just manually apply the Pythagoras Theorem instead of changing the // SRID in the case where ST_SRID() does not support a second parameter yet (see // SetSrid()). if (_options.ServerVersion.SupportsSpatialSupportFunctionAdditions && _options.ServerVersion.SupportsSpatialDistanceFunctionImplementsAndoyer) { return(_sqlExpressionFactory.Case( new[] { new CaseWhenClause( _sqlExpressionFactory.Equal( _sqlExpressionFactory.Function( "ST_SRID", new[] { arguments[1] }, typeof(int)), _sqlExpressionFactory.Constant(0)), GetStDistanceFunctionCall( arguments[1], arguments[2], method.ReturnType, _sqlExpressionFactory.FindMapping(method.ReturnType), _sqlExpressionFactory)) }, GetStDistanceFunctionCall( SetSrid(arguments[1], 0, _sqlExpressionFactory, _options), SetSrid(arguments[2], 0, _sqlExpressionFactory, _options), method.ReturnType, _sqlExpressionFactory.FindMapping(method.ReturnType), _sqlExpressionFactory))); } return(GetStDistanceFunctionCall( arguments[1], arguments[2], method.ReturnType, _sqlExpressionFactory.FindMapping(method.ReturnType), _sqlExpressionFactory)); } if (Equals(method, _spatialDistanceSphere)) { if (!(arguments[3] is SqlConstantExpression algorithm)) { throw new InvalidOperationException("The 'algorithm' parameter must be supplied as a constant."); } return(GetStDistanceSphereFunctionCall( arguments[1], arguments[2], (SpatialDistanceAlgorithm)algorithm.Value, method.ReturnType, _sqlExpressionFactory.FindMapping(method.ReturnType), _sqlExpressionFactory, _options)); } return(null); }
private SqlExpression MakeStartsWithEndsWithExpressionImpl( SqlExpression target, [NotNull] Func <SqlExpression, SqlExpression> targetTransform, SqlExpression prefixSuffix, [NotNull] Func <SqlExpression, SqlExpression> prefixSuffixTransform, bool startsWith) { var stringTypeMapping = ExpressionExtensions.InferTypeMapping(target, prefixSuffix); target = _sqlExpressionFactory.ApplyTypeMapping(target, stringTypeMapping); prefixSuffix = _sqlExpressionFactory.ApplyTypeMapping(prefixSuffix, stringTypeMapping); if (prefixSuffix is SqlConstantExpression constantPrefixSuffixExpression) { // The prefix is constant. Aside from null or empty, we escape all special characters (%, _, \) // in C# and send a simple LIKE. if (constantPrefixSuffixExpression.Value is string constantPrefixSuffixString) { // TRUE (pattern == "") // something LIKE 'foo%' (pattern != "", StartsWith()) // something LIKE '%foo' (pattern != "", EndsWith()) return(constantPrefixSuffixString == string.Empty ? (SqlExpression)_sqlExpressionFactory.Constant(true) : _sqlExpressionFactory.Like( targetTransform(target), prefixSuffixTransform( _sqlExpressionFactory.Constant( (startsWith ? string.Empty : "%") + EscapeLikePattern(constantPrefixSuffixString) + (startsWith ? "%" : string.Empty))))); } // https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/issues/996#issuecomment-607876040 // Can return NULL in .NET 5 after https://github.com/dotnet/efcore/issues/20498 has been fixed. // `something LIKE NULL` always returns `NULL`. We will return `false`, to indicate, that no match // could be found, because returning a constant of `NULL` will throw later in EF Core when used as // a predicate. // return _sqlExpressionFactory.Constant(null, RelationalTypeMapping.NullMapping); // This results in NULL anyway, but works around EF Core's inability to handle predicates that are // constant null values. return(_sqlExpressionFactory.Like(target, _sqlExpressionFactory.Constant(null, stringTypeMapping))); } // TODO: Generally, LEFT & compare is faster than escaping potential pattern characters with REPLACE(). // However, this might not be the case, if the pattern is constant after all (e.g. `LCASE('fo%o')`), in // which case, `something LIKE CONCAT(REPLACE(REPLACE(LCASE('fo%o'), '%', '\\%'), '_', '\\_'), '%')` should // be faster than `LEFT(something, CHAR_LENGTH('fo%o')) = LCASE('fo%o')`. // See https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/issues/996#issuecomment-607733553 // The prefix is non-constant, we use LEFT to extract the substring and compare. return(_sqlExpressionFactory.Equal( _sqlExpressionFactory.Function( startsWith ? "LEFT" : "RIGHT", new[] { targetTransform(target), CharLength(prefixSuffix) }, typeof(string), stringTypeMapping), prefixSuffixTransform(prefixSuffix))); }