private static string Write(TextWriter writer, Expression expression, AtkExpSqlType atkSql, string leftBracket,
string rightBracket)
{
expression = AtkPartialEvaluator.Eval(expression);
var expressionWriterSql = new AtkExpressionWriterSql <T>(writer)
{
_leftBracket = leftBracket,
_rightBracket = rightBracket,
atkRead = atkSql
};
expressionWriterSql.Visit(expression);
switch (atkSql)
{
case AtkExpSqlType.AtkWhere:
return(Regex.Replace(expressionWriterSql.atkWhereResult, "and\\s?$", ""));
case AtkExpSqlType.AtkOrder:
return(Regex.Replace(expressionWriterSql.atkOrderResult, ",\\s?$", ""));
default:
return(string.Empty);
}
}
private static string Write(TextWriter writer, System.Linq.Expressions.Expression expression, AtkExpSqlType atkSql, string tableAlias)
{
expression = AtkPartialEvaluator.Eval(expression);
var atkR = new AtkExpressionWriterSql(writer);
if (!string.IsNullOrWhiteSpace(tableAlias))
{
atkR._tableAlias = "[" + tableAlias + "].";
}
atkR.atkRead = atkSql;
atkR.Visit(expression);
string result = string.Empty;
switch (atkSql)
{
case AtkExpSqlType.atkOrder:
result = Regex.Replace(atkR.atkOrdeRsult, @",\s?$", "");
return(result);
case AtkExpSqlType.atkWhere:
result = Regex.Replace(atkR.atkWhereResult, @"and\s?$", "");
return(result);;
default: return(string.Empty);
}
}
private static CustomSqlWriteExpressionResult?WriteWithParameter(TextWriter writer, Expression expression,
AtkExpSqlType atkSql, string leftBracket,
string rightBracket)
{
expression = AtkPartialEvaluator.Eval(expression);
PartialSelectSelectParameterDefinition leftConstantParameterDefinition = null;
PartialSelectSelectParameterDefinition rightConstantParameterDefinition = null;
var expressionOperator = string.Empty;
var expressionWriterSql = new AtkExpressionWriterSql <T>(writer)
{
_leftBracket = leftBracket,
_rightBracket = rightBracket,
atkRead = atkSql
};
expressionWriterSql.Visit(expression);
if (expression is LambdaExpression lambda)
{
var body = lambda.Body as BinaryExpression;
expressionOperator = new AtkExpressionWriterSql <T>(writer).GetOperator(lambda.Body.NodeType);
if (body != null && body.Left.NodeType == ExpressionType.Constant)
{
if (body.Left is ConstantExpression b)
{
leftConstantParameterDefinition = new PartialSelectSelectParameterDefinition
{
DbType = ClrTypeToSqlDbTypeMapper.GetSqlDbTypeFromClrType(body.Left.Type),
Direction = ParameterDirection.Input,
IsNullable = body.Left.Type.IsNullable(),
Value = Convert.ChangeType(b.Value, body.Left.Type)
}
}
;
}
if (body != null && body.Right.NodeType == ExpressionType.Constant)
{
if (body.Right is ConstantExpression b)
{
rightConstantParameterDefinition = new PartialSelectSelectParameterDefinition
{
DbType = ClrTypeToSqlDbTypeMapper.GetSqlDbTypeFromClrType(body.Right.Type),
Direction = ParameterDirection.Input,
IsNullable = body.Right.Type.IsNullable(),
Value = Convert.ChangeType(b.Value,
Nullable.GetUnderlyingType(body.Right.Type) ?? body.Right.Type)
}
}
}
;
}
switch (atkSql)
{
case AtkExpSqlType.AtkWhere:
return(new CustomSqlWriteExpressionResult(
Regex.Replace(expressionWriterSql.atkWhereResult, "and\\s?$", ""),
expressionOperator,
leftConstantParameterDefinition,
rightConstantParameterDefinition
));
case AtkExpSqlType.AtkOrder:
return(null); //Regex.Replace(expressionWriterSql.atkOrderResult, ",\\s?$", "");
default:
return(null);
}
}
