Home  >  Article  >  Database  >  从Oracle数据库到SQLServer数据库主键的迁移

从Oracle数据库到SQLServer数据库主键的迁移

WBOY
WBOYOriginal
2016-06-07 15:13:381220browse

由于项目需要要将以前Oracle的 数据库 转化为SQL Server,今天利用SQL Server的DTD进行 数据库 的 迁移 ,但导入以后发现只导入了表结构和数据,而表的一些主键约束都没导过来,感觉很郁闷,而手头又没有好的 迁移 工具,如Erwin,所以动手写了个小工具,基本

由于项目需要要将以前Oracle的数据库转化为SQL Server,今天利用SQL Server的DTD进行数据库迁移,但导入以后发现只导入了表结构和数据,而表的一些主键约束都没导过来,感觉很郁闷,而手头又没有好的迁移工具,如Erwin,所以动手写了个小工具,基本实现了主键的转移,主要代码如下:

主要控件:

ADOConnOrcale: TADOConnection; //连接Oracle
ADOConnSQLServer: TADOConnection; //连接SQL Server

O1: TADOQuery; //连接Oracle
S1: TADOQuery; //连接SQL Server
S2: TADOQuery; //连接SQL Server

ProgressBar1: TProgressBar; //进度条
Memo1: TMemo; //显示出错信息
EdtServer: TEdit; //服务器
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';

在执行前先进行Oracle和SQL Server数据库的连接。

连接Oracle:

ADOConnOrcale.ConnectionString :=Format(ORAConnStr,[trim(EdtDataBase.Text),

trim(EdtUser.Text),trim(EdtPass.Text)]);
try
ADOConnOrcale.Open;
MsgBox('Oracle数据库连接成功!');
Except
MsgBox('Oracle数据库连接失败!');
end;

连接SQL Server:

ADOConnSQLServer.ConnectionString :=Format(SQLConnStr,[trim(EdtServer.Text),
trim(EdtDataBase.Text),trim(EdtUser.Text),trim(EdtPass.Text)]);
try
ADOConnSQLServer.Open;
MsgBox('SQL Server数据库连接成功!')
except
MsgBox('SQL Server数据库连接失败!');
end;

主要执行代码,比较乱,没有整理,不过实现功能就行了。

procedure TForm1.Button1Click(Sender: TObject);
var
i:Integer;
FieldN, tableN, fieldM,aa:String;
begin
if Not ADOConnOrcale.Connected then
begin
MsgBox('请先连接Oracle数据库!');
exit;
end;
if not ADOConnSQLServer.Connected then
begin
MsgBox('请先连接SQL Server数据库!');
exit;
end;
Screen.Cursor :=crHourGlass;
try
o1.Close;
O1.SQL.Clear;
//取oracle表用户budget的所有主键约束信息
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;
//判断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,输出表明和字段名
if s2.RecordCountbegin
Memo1.Text:=Memo1.Text+#13+'表:''+O1.fieldbyname('table_name').AsString+''+
' 字段:''+O1.fieldbyname('COLUMN_NAME').AsString+'' 不存在!';
计算机教程从Oracle数据库到SQLServer数据库主键的迁移来自
[url]www.itwen.comIT[/url] WEN计算机教程网

O1.Next;
tableN:=';
FieldN:=';
Continue;
end;
//是当前表,循环读取主键信息
if (tableN=') or (tableN= O1.fieldbyname('table_name').AsString) then
begin
FieldN:=FieldN+'['+O1.fieldbyname('COLUMN_NAME').AsString+'],';//表明相同或初试时
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;
//如果该主键在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;

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn