因为项目必要要将早年Oracle的数据库转化为SQL Server,本日操作SQL Server的DTD举办数据库的迁徙,但导入往后发明只导入了表布局和数据,而表的一些主键束缚都没导过来,感受很忧郁,而手头又没有好的迁徙器材,如Erwin,以是下手写了个小器材,根基实现了主键的转移,首要代码如下: 首要控件: ADOConnOrcale: TADOConnection; //毗连Oracle ADOConnSQLServer: TADOConnection; //毗连SQL Server O1: TADOQuery; //毗连Oracle S1: TADOQuery; //毗连SQL Server S2: TADOQuery; //毗连SQL Server ProgressBar1: TProgressBar; //进度条 Memo1: TMemo; //表现堕落信息 EdtServer: TEdit; //处事器 EdtDataBase: TEdit; //数据库名称 EdtUser: TEdit; //用户名 EdtPass: TEdit; //口令 Button1: TButton; //执行按钮 //常量 const ORAConnStr='Provider=MSDAORA.1;Data Source=%S;User ID=%S;Password=%S;Persist Security Info=True'; SQLConnStr='Provider=SQLOLEDB.1;Data Source=%S;Initial Catalog=%S;User ID=%S;Password=%S;Persist Security Info=False'; 在执行前先举办Oracle和SQL Server数据库的毗连。 毗连Oracle: ADOConnOrcale.ConnectionString :=Format(ORAConnStr,[trim(EdtDataBase.Text), trim(EdtUser.Text),trim(EdtPass.Text)]); try ADOConnOrcale.Open; MsgBox('Oracle数据库毗连乐成!'); Except MsgBox('Oracle数据库毗连失败!'); end; 毗连SQL Server: ADOConnSQLServer.ConnectionString :=Format(SQLConnStr,[trim(EdtServer.Text), trim(EdtDataBase.Text),trim(EdtUser.Text),trim(EdtPass.Text)]); try ADOConnSQLServer.Open; MsgBox('SQL Server数据库毗连乐成!') except MsgBox('SQL Server数据库毗连失败!'); end; 首要执行代码,较量乱,没有清算,不外实现成果就行了。 procedure TForm1.Button1Click(Sender: TObject); var i:Integer; FieldN, tableN, fieldM,aa:String; begin if Not ADOConnOrcale.Connected then begin MsgBox('请先毗连Oracle数据库!'); exit; end; if not ADOConnSQLServer.Connected then begin MsgBox('请先毗连SQL Server数据库!'); exit; end; Screen.Cursor :=crHourGlass; try o1.Close; O1.SQL.Clear; //取oracle表用户budget的全部主键束缚信息 o1.SQL.Text :=' select a.CONSTRAINT_NAME,a.CONSTRAINT_TYPE,a.TABLE_NAME, b.COLUMN_NAME,b.position '+ ' from USER_CONSTRAINTS a,USER_CONS_COLUMNS b where a.CONSTRAINT_NAME=b.CONSTRAINT_NAME '+ ' and a.table_name=b.table_name and constraint_type=''P'' and a.owner=b.owner '+ ' and lower(a.owner)=''budget'' order by a.table_name,b.position '; O1.open; tableN:=''; O1.First; ProgressBar1.Max:=O1.RecordCount; ProgressBar1.Min:=0; ProgressBar1.Step:=1; ProgressBar1.Visible :=true; for i:=0 to O1.RecordCount -1 do begin s2.Close; S2.SQL.Clear; //判定SQL Server表是否存在当前的字段信息 S2.SQL.Text:='SELECT a.name AS tanme, b.* FROM sysobjects a INNER JOIN '+ ' syscolumns b ON a.id = b.id '+ ' WHERE (a.xtype = ''U'') AND (a.name = '''+O1.fieldbyname('table_name').AsString+''''+ ') and b.name= '''+O1.fieldbyname('COLUMN_NAME').AsString+''''+ ' ORDER BY b.id'; S2.Open; //不存在,输出表白和字段名 if s2.RecordCount<=0 then begin Memo1.Text:=Memo1.Text+#13+'表:'''+O1.fieldbyname('table_name').AsString+''''+ ' 字段:'''+O1.fieldbyname('COLUMN_NAME').AsString+''' 不存在!'; O1.Next; tableN:=''; FieldN:=''; Continue; end; //是当前表,轮回读取主键信息 if (tableN='') or (tableN= O1.fieldbyname('table_name').AsString) then begin FieldN:=FieldN+'['+O1.fieldbyname('COLUMN_NAME').AsString+'],';//表白沟通或初试时 tableN:= O1.fieldbyname('table_name').AsString; end else begin with S1 do begin try //取SQL Server表的主键信息 Close; sql.Clear; sql.Text:='SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME='''+tableN+''''; Open; first; aa:=fieldbyname('constraint_name').AsString; //假如该主键在SQL表中已存在,删除该主键信息,重建该表主键 if recordcount>0 then begin sql.Clear; SQL.Text:='ALTER TABLE '+tableN+' DROP CONSTRAINT '+aa; //删除主键 ExecSQL; end; SQL.Clear; //COLUMN_NAME SQL.Text:='ALTER TABLE '+tableN+' WITH NOCHECK ADD '+ ' CONSTRAINT [PK_'+tableN+'] PRIMARY KEY NONCLUSTERED '+ ' ( '+ copy(FieldN,1,length(FieldN)-1)+ ' )'; ExecSQL; FieldN:='['+O1.fieldbyname('COLUMN_NAME').AsString+'],'; tableN:= O1.fieldbyname('table_name').AsString; Except Memo1.Text :=Memo1.Text+'表: '+tableN+' 字段: '+FieldN+' 导入堕落!'; exit; end; end; end; ProgressBar1.StepIt; Application.ProcessMessages; O1.Next; end; MsgBox('导入完成!'); finally Screen.Cursor :=crDefault; ProgressBar1.Visible :=False; end; end; (编辑:河北网)
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