1.声明变量
DECLARE @F001 SMALLINT , @F002 INTEGER , @F003 VARCHAR ( 20 ), @F004 CHAR ( 20 ), @F002 MONEY 2.赋值语句
set @F001 = space ( 40 )
3.条件判断(IF…ELSE)
If condition Begin [ statements ] END ELSE BEGIN [ elseifstatements ] END
4.多分支判断(case…when…then…else…end）
SET @F011 = CASE WHEN [ testexpression1 ] THEN @F001 WHEN [ testexpression2 ] THEN @F002 WHEN [ testexpression3 ] THEN @F003 WHEN [ testexpression4 ] THEN @F004 END
5.循环(while)
While condition Begin [ statements ] End
6.动态定义游标
SET @strSQL = ‘ DECLARE name_cursor CURSOR FOR ‘ @inSQL EXEC ( @strSQL )
7.遍历游标
FETCH NEXT FROM name_cursor into @F001 , @F002 WHILE @@FETCH_STATUS = 0 BEGIN
FETCH NEXT FROM name_cursor into @F001 , @F002
END
说明：FETCH_STATUS检索到数据返回0，失败返回-1，可判断是否滚动未到结尾。
8.获得游标行数
SET @RECCNT = @@ROWCOUNT
9.事务处理
BEGIN distributed transaction
WHILE @@TRANCOUNT > 0 commit transaction
10.字符串连接
SET @m_sql = @m_sql ‘ Where F001 = ”’ @F001 ”” SET @m_sql = @m_sql ‘ F002 = ‘ CONVERT ( varchar , @F002 )
11.创建临时表存储外部数据表 说明:临时过程用 # 和 ## 命名，可以由任何用户创建。创建过程后，局部过程的所有者是唯一可以使用该过程的用户。
CREATE TABLE #DMPARHED (FMCD int , FMNAM varchar ( 50 ), MGYO1 smallint , constraint DMPARHED_P primary key (FMCD)) SET @aSQL = ” SET @aSQL = @aSQL ‘ INSERT INTO #DMPARHED ‘ SET @aSQL = @aSQL ‘ SELECT FMCD,FMNAM,MGYO1 FROM ‘ SET @aSQL = @aSQL ‘ OPENQUERY(Lk_MDB_NEO32, ” SELECT FMCD,FMNAM,MGYO1 FROM DMPARHED ‘ SET @aSQL = @aSQL ‘ WHERE SYSNO = 1 ” ) ‘ execute ( @aSQL )
创建临时表的另类方法：
select a.name,a.password from with as temp1 select * from emp ( select * from temp1 union select * from temp1) a where a.name = ‘ hao ‘ ;
12.存储过程的调用及返回值 （1）存储过程的声明
CREATE PROCEDURE name_produce @F001 VARCHAR ( 20 ), @F002 SMALLINT OUTPUT
（2）VB.NET调用存储过程
Private SqlCmd As New OleDb.OleDbCommand
SqlCmd.CommandText = “ prNK3020SC03 “ SqlCmd.CommandType = CommandType.StoredProcedure
Dim parampre1 As OleDb.OleDbParameter = SqlCmd.Parameters.Add( _ New OleDb.OleDbParameter( “ @F001 “ , OleDb.OleDbType.VarChar, 20 , _ ParameterDirection.Input)) Dim parampre2 As OleDb.OleDbParameter = SqlCmd.Parameters.Add( _ New OleDb.OleDbParameter( “ @F002 “ , OleDb.OleDbType.SmallInt)) parampre2.Direction = ParameterDirection.Output
SqlCmd.Parameters( “ @F001 “ ).Value = aF001 SqlCmd.Parameters( “ @F002 “ ).Value = aF002 SqlCmd.ExecuteNonQuery() aF002 = SqlCmd.Parameters( “ @F002 “ ).Value.ToString()
（3）存储过程调用存储过程
DECLARE @C001 VARCHAR ( 20 ), @C002 SMALLINT EXEC name_produce @C001 , @C002 output
CREATE PROCEDURE dbo.getUserName @UserID int , @UserName varchar ( 40 ) output as set nocount on begin if @UserID is null return select @UserName = username from dbo. [ userinfo ] where userid = @UserID return end
13.Update语句常见错误总结 — √ Update name_table set F001 = @F181 , F002 = @F182 Where F003 = @F003 — × Update name_table F001 = @F181 , F002 = @F182 Where F003 = @F003 — × Update name_table set F001 = @F181 , F002 = @F182 , Where F003 = @F003 — × Update name_table set ,F001 = @F181 ,F002 = @F182 Where F003 = @F003
14.Insert语句常见语法错误总结 — √ INSERT INTO name_table( ,KEY_FIELD，BUSYOCD ) Values ( @F001 , @F002 ) — × INSERT INTO name_table( F001,F002 ) Values ( , @F001 , @F002 ) — × INSERT INTO name_table( F001,F002 ) Values ( @F001 , @F002 , ) — × INSERT name_table( F001,F002 ) Values ( @F001 , @F002 )
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