public override IQueryState Visit(JoinQueryExpression exp)
{
ResultElement resultElement = new ResultElement();
IQueryState qs = QueryExpressionVisitor.VisitQueryExpression(exp.PrevExpression);
FromQueryResult fromQueryResult = qs.ToFromQueryResult();
DbFromTableExpression fromTable = fromQueryResult.FromTable;
resultElement.FromTable = fromTable;
List <IMappingObjectExpression> moeList = new List <IMappingObjectExpression>();
moeList.Add(fromQueryResult.MappingObjectExpression);
foreach (JoiningQueryInfo joiningQueryInfo in exp.JoinedQueries)
{
JoinQueryResult joinQueryResult = JoinQueryExpressionVisitor.VisitQueryExpression(joiningQueryInfo.Query.QueryExpression, resultElement, joiningQueryInfo.JoinType, joiningQueryInfo.Condition, moeList);
var nullChecking = DbExpression.CaseWhen(new DbCaseWhenExpression.WhenThenExpressionPair(joinQueryResult.JoinTable.Condition, DbConstantExpression.One), DbConstantExpression.Null, DbConstantExpression.One.Type);
if (joiningQueryInfo.JoinType == JoinType.LeftJoin)
{
joinQueryResult.MappingObjectExpression.SetNullChecking(nullChecking);
}
else if (joiningQueryInfo.JoinType == JoinType.RightJoin)
{
foreach (IMappingObjectExpression item in moeList)
{
item.SetNullChecking(nullChecking);
}
}
else if (joiningQueryInfo.JoinType == JoinType.FullJoin)
{
joinQueryResult.MappingObjectExpression.SetNullChecking(nullChecking);
foreach (IMappingObjectExpression item in moeList)
{
item.SetNullChecking(nullChecking);
}
}
fromTable.JoinTables.Add(joinQueryResult.JoinTable);
moeList.Add(joinQueryResult.MappingObjectExpression);
}
IMappingObjectExpression moe = SelectorExpressionVisitor.ResolveSelectorExpression(exp.Selector, moeList);
resultElement.MappingObjectExpression = moe;
GeneralQueryState queryState = new GeneralQueryState(resultElement);
return(queryState);
}
public override IQueryState Visit(JoinQueryExpression exp)
{
IQueryState qs = QueryExpressionResolver.Resolve(exp.PrevExpression, this._scopeParameters, this._scopeTables);
QueryModel queryModel = qs.ToFromQueryModel();
List <IObjectModel> modelList = new List <IObjectModel>();
modelList.Add(queryModel.ResultModel);
foreach (JoinQueryInfo joinQueryInfo in exp.JoinedQueries)
{
ScopeParameterDictionary scopeParameters = queryModel.ScopeParameters.Clone(queryModel.ScopeParameters.Count + modelList.Count);
for (int i = 0; i < modelList.Count; i++)
{
ParameterExpression p = joinQueryInfo.Condition.Parameters[i];
scopeParameters[p] = modelList[i];
}
JoinQueryResult joinQueryResult = JoinQueryExpressionResolver.Resolve(joinQueryInfo, queryModel, scopeParameters);
var nullChecking = DbExpression.CaseWhen(new DbCaseWhenExpression.WhenThenExpressionPair(joinQueryResult.JoinTable.Condition, DbConstantExpression.One), DbConstantExpression.Null, DbConstantExpression.One.Type);
if (joinQueryInfo.JoinType == JoinType.LeftJoin)
{
joinQueryResult.ResultModel.SetNullChecking(nullChecking);
}
else if (joinQueryInfo.JoinType == JoinType.RightJoin)
{
foreach (IObjectModel item in modelList)
{
item.SetNullChecking(nullChecking);
}
}
else if (joinQueryInfo.JoinType == JoinType.FullJoin)
{
joinQueryResult.ResultModel.SetNullChecking(nullChecking);
foreach (IObjectModel item in modelList)
{
item.SetNullChecking(nullChecking);
}
}
queryModel.FromTable.JoinTables.Add(joinQueryResult.JoinTable);
modelList.Add(joinQueryResult.ResultModel);
}
ScopeParameterDictionary scopeParameters1 = queryModel.ScopeParameters.Clone(queryModel.ScopeParameters.Count + modelList.Count);
for (int i = 0; i < modelList.Count; i++)
{
ParameterExpression p = exp.Selector.Parameters[i];
scopeParameters1[p] = modelList[i];
}
IObjectModel model = SelectorResolver.Resolve(exp.Selector, scopeParameters1, queryModel.ScopeTables);
queryModel.ResultModel = model;
GeneralQueryState queryState = new GeneralQueryState(queryModel);
return(queryState);
}
public override IQueryState Visit(JoinQueryExpression exp)
{
IQueryState qs = QueryExpressionVisitor.VisitQueryExpression(exp.PrevExpression, this._scopeParameters, this._scopeTables);
ResultElement resultElement = qs.ToFromQueryResult();
List <IMappingObjectExpression> moeList = new List <IMappingObjectExpression>();
moeList.Add(resultElement.MappingObjectExpression);
foreach (JoiningQueryInfo joiningQueryInfo in exp.JoinedQueries)
{
ScopeParameterDictionary scopeParameters = resultElement.ScopeParameters.Clone(resultElement.ScopeParameters.Count + moeList.Count);
for (int i = 0; i < moeList.Count; i++)
{
ParameterExpression p = joiningQueryInfo.Condition.Parameters[i];
scopeParameters[p] = moeList[i];
}
JoinQueryResult joinQueryResult = JoinQueryExpressionVisitor.VisitQueryExpression(joiningQueryInfo.Query.QueryExpression, resultElement, joiningQueryInfo.JoinType, joiningQueryInfo.Condition, scopeParameters);
var nullChecking = DbExpression.CaseWhen(new DbCaseWhenExpression.WhenThenExpressionPair(joinQueryResult.JoinTable.Condition, DbConstantExpression.One), DbConstantExpression.Null, DbConstantExpression.One.Type);
if (joiningQueryInfo.JoinType == JoinType.LeftJoin)
{
joinQueryResult.MappingObjectExpression.SetNullChecking(nullChecking);
}
else if (joiningQueryInfo.JoinType == JoinType.RightJoin)
{
foreach (IMappingObjectExpression item in moeList)
{
item.SetNullChecking(nullChecking);
}
}
else if (joiningQueryInfo.JoinType == JoinType.FullJoin)
{
joinQueryResult.MappingObjectExpression.SetNullChecking(nullChecking);
foreach (IMappingObjectExpression item in moeList)
{
item.SetNullChecking(nullChecking);
}
}
resultElement.FromTable.JoinTables.Add(joinQueryResult.JoinTable);
moeList.Add(joinQueryResult.MappingObjectExpression);
}
ScopeParameterDictionary scopeParameters1 = resultElement.ScopeParameters.Clone(resultElement.ScopeParameters.Count + moeList.Count);
for (int i = 0; i < moeList.Count; i++)
{
ParameterExpression p = exp.Selector.Parameters[i];
scopeParameters1[p] = moeList[i];
}
IMappingObjectExpression moe = SelectorExpressionVisitor.ResolveSelectorExpression(exp.Selector, scopeParameters1, resultElement.ScopeTables);
resultElement.MappingObjectExpression = moe;
GeneralQueryState queryState = new GeneralQueryState(resultElement);
return(queryState);
}
public virtual GeneralQueryState AsSubQueryState()
{
DbSqlQueryExpression sqlQuery = this.CreateSqlQuery();
DbSubQueryExpression subQuery = new DbSubQueryExpression(sqlQuery);
ResultElement result = new ResultElement();
DbTableSegment tableSeg = new DbTableSegment(subQuery, result.GenerateUniqueTableAlias());
DbFromTableExpression fromTable = new DbFromTableExpression(tableSeg);
result.FromTable = fromTable;
DbTable table = new DbTable(tableSeg.Alias);
//TODO 根据旧的生成新 MappingMembers
IMappingObjectExpression newMoe = this.Result.MappingObjectExpression.ToNewObjectExpression(sqlQuery, table);
result.MappingObjectExpression = newMoe;
//得将 subQuery.SqlQuery.Orders 告诉 以下创建的 result
//将 orderPart 传递下去
if (this.Result.OrderSegments.Count > 0)
{
for (int i = 0; i < this.Result.OrderSegments.Count; i++)
{
DbOrderSegment orderPart = this.Result.OrderSegments[i];
DbExpression orderExp = orderPart.DbExpression;
string alias = null;
DbColumnSegment columnExpression = sqlQuery.ColumnSegments.Where(a => DbExpressionEqualityComparer.EqualsCompare(orderExp, a.Body)).FirstOrDefault();
// 对于重复的则不需要往 sqlQuery.Columns 重复添加了
if (columnExpression != null)
{
alias = columnExpression.Alias;
}
else
{
alias = Utils.GenerateUniqueColumnAlias(sqlQuery);
DbColumnSegment columnSeg = new DbColumnSegment(orderExp, alias);
sqlQuery.ColumnSegments.Add(columnSeg);
}
DbColumnAccessExpression columnAccessExpression = new DbColumnAccessExpression(orderExp.Type, table, alias);
result.OrderSegments.Add(new DbOrderSegment(columnAccessExpression, orderPart.OrderType));
}
}
result.IsOrderSegmentsFromSubQuery = true;
GeneralQueryState queryState = new GeneralQueryState(result);
return queryState;
}
