public virtual IQueryState Accept(AggregateQueryExpression exp)
{
List <DbExpression> dbArguments = new List <DbExpression>(exp.Arguments.Count);
foreach (Expression argument in exp.Arguments)
{
var arg = (LambdaExpression)argument;
ScopeParameterDictionary scopeParameters = this._resultElement.ScopeParameters.Clone(arg.Parameters[0], this._resultElement.MappingObjectExpression);
var dbArgument = GeneralExpressionVisitor.ParseLambda(arg, scopeParameters, this._resultElement.ScopeTables);
dbArguments.Add(dbArgument);
}
DbAggregateExpression dbAggregateExp = new DbAggregateExpression(exp.ElementType, exp.Method, dbArguments);
MappingFieldExpression mfe = new MappingFieldExpression(exp.ElementType, dbAggregateExp);
ResultElement result = new ResultElement(this._resultElement.ScopeParameters, this._resultElement.ScopeTables);
result.MappingObjectExpression = mfe;
result.FromTable = this._resultElement.FromTable;
result.AppendCondition(this._resultElement.Condition);
AggregateQueryState state = new AggregateQueryState(result);
return(state);
}
IMappingObjectExpression VisistMapTypeSelector(Expression exp)
{
if (!MappingTypeSystem.IsMappingType(exp.Type))
{
throw new NotSupportedException(exp.ToString());
}
DbExpression dbExp = this.ResolveExpression(exp);
MappingFieldExpression ret = new MappingFieldExpression(exp.Type, dbExp);
return(ret);
}
/// <summary>
/// a => a.Id a => a.Name a => a.User
/// </summary>
/// <param name="exp"></param>
/// <returns></returns>
protected override IMappingObjectExpression VisitMemberAccess(MemberExpression exp)
{
//create MappingFieldExpression object if exp is map type
if (MappingTypeSystem.IsMappingType(exp.Type))
{
DbExpression dbExp = this.ResolveExpression(exp);
MappingFieldExpression ret = new MappingFieldExpression(exp.Type, dbExp);
return(ret);
}
//如 a.Order a.User 等形式
return(this.ResolveComplexMember(exp));
}
protected override DbExpression VisitParameter(ParameterExpression exp)
{
//TODO 只支持 MappingFieldExpression 类型，即类似 q.Select(a=> a.Id).Where(a=> a > 0) 这种情况，也就是 ParameterExpression.Type 为基本映射类型。
if (MappingTypeSystem.IsMappingType(exp.Type))
{
IMappingObjectExpression moe = this.FindMoe(exp);
MappingFieldExpression mfe = (MappingFieldExpression)moe;
return(mfe.Expression);
}
else
{
throw new NotSupportedException(exp.ToString());
}
}
protected override DbExpression VisitParameter(ParameterExpression exp)
{
//TODO 只支持 MappingFieldExpression 类型，即类似 q.Select(a=> a.Id).Where(a=> a > 0) 这种情况，也就是 ParameterExpression.Type 为基本映射类型。
if (Utils.IsMapType(exp.Type))
{
int idx = this.FindParameterIndex(exp);
IMappingObjectExpression moe = this._moeList[idx];
MappingFieldExpression mfe = (MappingFieldExpression)moe;
return(mfe.Expression);
}
else
{
throw new NotSupportedException(exp.ToString());
}
}
public virtual IQueryState Accept(FunctionExpression exp)
{
List <DbExpression> dbParameters = new List <DbExpression>(exp.Parameters.Count);
foreach (Expression pExp in exp.Parameters)
{
var dbExp = GeneralExpressionVisitor.VisitPredicate((LambdaExpression)pExp, this.MoeList);
dbParameters.Add(dbExp);
}
DbFunctionExpression dbFuncExp = new DbFunctionExpression(exp.ElementType, exp.Method, dbParameters);
MappingFieldExpression mfe = new MappingFieldExpression(exp.ElementType, dbFuncExp);
ResultElement result = new ResultElement();
result.MappingObjectExpression = mfe;
result.FromTable = this._resultElement.FromTable;
result.AppendCondition(this._resultElement.Condition);
FunctionQueryState state = new FunctionQueryState(result);
return(state);
}
public virtual IQueryState Accept(FunctionExpression exp)
{
List<DbExpression> dbParameters = new List<DbExpression>(exp.Parameters.Count);
foreach (Expression pExp in exp.Parameters)
{
var dbExp = GeneralExpressionVisitor.VisitPredicate((LambdaExpression)pExp, this.MoeList);
dbParameters.Add(dbExp);
}
DbFunctionExpression dbFuncExp = new DbFunctionExpression(exp.ElementType, exp.Method, dbParameters);
MappingFieldExpression mfe = new MappingFieldExpression(exp.ElementType, dbFuncExp);
ResultElement result = new ResultElement();
result.MappingObjectExpression = mfe;
result.FromTable = this._resultElement.FromTable;
result.AppendCondition(this._resultElement.Condition);
FunctionQueryState state = new FunctionQueryState(result);
return state;
}