FDMemTable2.AppendRecord([103,'ccc']); FDMemTable2.LocalSQL:=FDLocalSQL1; FDMemTable2.Active:=true;//===FDQuery1.Connection:=FDConnection1; FDQuery1.SQL.Text:='select * from FDMemTable1, FDMemTable2 where FDMemTable1.aID=FDMemTable2.aID'; //这里写SQL语句 FDQuery1.Active:=true...
FDQuery->Open("select * from tt"); FDMemTable2->Data = FDQuery->Data; FDMemTable2是全部记录,有3条记录。 FDMemTable1->Delete();后的记录不在Data里。 2)CopyDataSet 带结构拷贝 FDMemTable2->CopyDataSet(FDMemTable1, TFDCopyDataSetOptions() << coStructure << coRestart << coAppend); ...
FDMemTable1.LocalSQL:= FDLocalSQL1; FDMemTable1.Active:=true; FDQuery1.Connection:= FDConnection1; FDQuery1.SQL.Text:='select * from FDMemTable1 where aid>101 ' ; FDQuery1.Active:=true; DataSource1.DataSet:= FDQuery1; DbGrid1.DataSource:= DataSource1; end; 1. 2. 3. 4. 5....
问Delphi:在MemTable或其他类型的数据集上执行SQL查询EN之前在“这个场景更适合使用NoSQL”文章中通过和S...
#include <memory> //For STL auto_ptr class std::auto_ptr<TFDMemTable> table (new TFDMemTable(NULL)); 一句就可以了 FDMemTable1->CopyDataSet(dm->ADOQueryPub, TFDCopyDataSetOptions() << coStructure << coRestart << coAppend);
⽤好FDMemTable代替之前的ClientDataSet，以前ClientDataSet内存表转换太繁琐了步骤。TClientDataSet *cds = new TClientDataSet(this);DataSetProvider1->DataSet = dm->ADOQueryPub;cds->ProviderName = "DataSetProvider1";cds->Open();c++智能指针 #include <memory> //For STL auto_ptr class std::auto_ptr...
MVCNamedSQLQuery allows to define a "named query" which is, well, a SQL query with a name. Then such query can be used by the method SelectByNamedQuery<T> or SelectByNamedQuery. Moreover in the attribute it is possible to define on which backend engine that query is usable. In this...
TheFDConnection1provides SQLite in-memory connection. For that DriverName property is set toSQLite. TheFDLocalSQL1.Connectionand theFDQuery1.Connectionare set to theFDConnection1. ClickingOpen, inserts the lines of the Memo1 on theFDQuery1and executes the Local SQL query: ...
演示在Delphi上使用内存表存储数据的例子。TdxMemData 属于DevExpressVcl控件,TVirtualTable属于UniDAC控件,TFDMemTable属于FireDAC控件。经过测试证明,TFDMemTable性能最好!
MVCNamedSQLQuery allows to define a "named query" which is, well, a SQL query with a name. Then such query can be used by the method SelectByNamedQuery<T> or SelectByNamedQuery. Moreover in the attribute it is possible to define on which backend engine that query is usable. In this...