private static object GetReturnValue(ISelectData select, List <RawTableRow> row)
{
var value = select.Select(new RawTableJoinRow(row));
return(IsParentUnaryNegate(select.Expression) ? HelperReflection.Negate(value) : value);
}
public static object GetValue(SqlScalarExpression expression, Type type, RawData rawData, List <RawTableRow> row, bool getTypeFromLiteral = false)
{
switch (expression)
{
case SqlColumnRefExpression columnRef:
{
var field = GetTableColumn(columnRef, rawData);
var select = new SelectDataFromColumn(field, rawData);
return(GetReturnValue(select, row));
}
case SqlUnaryScalarExpression unaryScalarExpression:
{
var value = GetValue(unaryScalarExpression.Expression, type, rawData, row);
if (unaryScalarExpression.Operator == SqlUnaryScalarOperatorType.Negative)
{
value = HelperReflection.Negate(value);
}
return(value);
}
case SqlLiteralExpression literal:
{
if (literal.Type == LiteralValueType.Null)
{
return(null);
}
var literalType = getTypeFromLiteral ? GetTypeFromLiteralType(literal.Type) : type;
return(GetValueFromString(literalType, literal));
}
case SqlScalarVariableRefExpression variableRef:
{
return(GetValueFromParameter(variableRef.VariableName, rawData.Parameters, rawData.Command.Variables));
}
case SqlScalarRefExpression scalarRef:
{
var field = GetTableColumn((SqlObjectIdentifier)scalarRef.MultipartIdentifier, rawData);
var select = new SelectDataFromColumn(field, rawData);
return(GetReturnValue(select, row));
}
case SqlGlobalScalarVariableRefExpression globalRef:
{
var select = new SelectDataFromGlobalVariables(globalRef.VariableName, rawData);
return(GetReturnValue(select, row));
}
case SqlBuiltinScalarFunctionCallExpression functionCall:
{
var select = new SelectDataBuilder( ).Build(functionCall, rawData);
return(GetReturnValue(select, row));
}
case SqlSearchedCaseExpression caseExpression:
{
var select = new SelectDataFromCaseExpression(caseExpression, rawData);
return(GetReturnValue(select, row));
}
case SqlScalarSubQueryExpression subQuery:
{
var database = new MemoryDbConnection().GetMemoryDatabase( );
var command = new MemoryDbCommand(rawData.Command.Connection, rawData.Command.Parameters, rawData.Command.Variables);
return(database.ExecuteSqlScalar(subQuery.QueryExpression.Sql, command));
}
case SqlBinaryScalarExpression binaryScalarExpression:
{
var select = new SelectDataFromBinaryScalarExpression(binaryScalarExpression, rawData);
return(GetReturnValue(select, row));
}
default:
throw new NotImplementedException($"Unsupported scalarExpression : '{ expression.GetType( ) }'");
}
}
