/// <inheritdoc/>
protected override IExpressionFragment CreateExpressionForBinary(GenerateContext context, DbExpression expression, ISourceFragment source)
{
var binary = (DbBinaryExpression)expression;
if (binary.Kind == EBinaryKind.Add && binary.ClrType == typeof(string))
{
var scalar = new ScalarFragment(context,
source.CreateExpression(binary.Left),
source.CreateExpression(binary.Right));
scalar.Function = SupportMembers.String.Concat;
return(scalar);
}
return(base.CreateExpressionForBinary(context, expression, source));
}
/// <summary>
/// 根据类型<see cref="DbScalarFunctionExpression"/>表达式创建表达式语句片段。
/// </summary>
/// <param name="context">生成上下文。</param>
/// <param name="expression">所在数据源。</param>
/// <param name="source">检索表达式。</param>
/// <returns>创建结果。</returns>
protected virtual IExpressionFragment CreateExpressionForScalarFunction(GenerateContext context, DbExpression expression, ISourceFragment source)
{
var scalar = (DbScalarFunctionExpression)expression;
var result = new ScalarFragment(context)
{
Function = scalar.Function
};
foreach (var arg in scalar.Arguments)
{
result.Arguments.Add(source.CreateExpression(arg));
}
return(result);
}
