private static void SetSqlTypeIfSimpleExpression(SqlExpression expression, ProviderType sqlType) { SqlSimpleTypeExpression simpleExpression = expression as SqlSimpleTypeExpression; if (simpleExpression != null) { simpleExpression.SetSqlType(sqlType); } }
internal override SqlExpression VisitLike(SqlLike like) { base.VisitLike(like); // When comparing a unicode pattern against a non-unicode expression, // we want retype the pattern as non-unicode. if (!like.Expression.SqlType.IsUnicodeType && like.Pattern.SqlType.IsUnicodeType && (like.Pattern.NodeType == SqlNodeType.Value || like.Pattern.NodeType == SqlNodeType.ClientParameter)) { SqlSimpleTypeExpression pattern = (SqlSimpleTypeExpression)like.Pattern; pattern.SetSqlType(pattern.SqlType.GetNonUnicodeEquivalent()); } return(like); }
internal override SqlExpression VisitBinaryOperator(SqlBinary bo) { base.VisitBinaryOperator(bo); if (bo.NodeType.IsComparisonOperator() && bo.Left.ClrType != typeof(bool) && bo.Right.ClrType != typeof(bool)) { // Strip unnecessary CONVERT calls. if (bo.Left.NodeType == SqlNodeType.Convert) { var conv = (SqlUnary)bo.Left; if (CanDbConvert(conv.Operand.ClrType, bo.Right.ClrType) && conv.Operand.SqlType.ComparePrecedenceTo(bo.Right.SqlType) != 1) { return(VisitBinaryOperator(new SqlBinary(bo.NodeType, bo.ClrType, bo.SqlType, conv.Operand, bo.Right))); } } if (bo.Right.NodeType == SqlNodeType.Convert) { var conv = (SqlUnary)bo.Right; if (CanDbConvert(conv.Operand.ClrType, bo.Left.ClrType) && conv.Operand.SqlType.ComparePrecedenceTo(bo.Left.SqlType) != 1) { return(VisitBinaryOperator(new SqlBinary(bo.NodeType, bo.ClrType, bo.SqlType, bo.Left, conv.Operand))); } } } if (bo.Right != null && bo.NodeType != SqlNodeType.Concat) { SqlExpression left = bo.Left; SqlExpression right = bo.Right; this.CoerceBinaryArgs(ref left, ref right); if (bo.Left != left || bo.Right != right) { bo = sql.Binary(bo.NodeType, left, right); } bo.SetSqlType(typeProvider.PredictTypeForBinary(bo.NodeType, left.SqlType, right.SqlType)); } if (bo.NodeType.IsComparisonOperator()) { // When comparing a unicode value against a non-unicode column, // we want retype the parameter as non-unicode. Func <SqlExpression, SqlExpression, bool> needsRetype = (expr, val) => (val.NodeType == SqlNodeType.Value || val.NodeType == SqlNodeType.ClientParameter) && !(expr.NodeType == SqlNodeType.Value || expr.NodeType == SqlNodeType.ClientParameter) && val.SqlType.IsUnicodeType && !expr.SqlType.IsUnicodeType; SqlSimpleTypeExpression valueToRetype = null; if (needsRetype(bo.Left, bo.Right)) { valueToRetype = (SqlSimpleTypeExpression)bo.Right; } else if (needsRetype(bo.Right, bo.Left)) { valueToRetype = (SqlSimpleTypeExpression)bo.Left; } if (valueToRetype != null) { valueToRetype.SetSqlType(valueToRetype.SqlType.GetNonUnicodeEquivalent()); } } return(bo); }