【SQLSERVER】存储过程基础

MsSQL 2020-09-28

1.声明变量

DECLARE @F001 SMALLINT,
@F002 INTEGER,0)"> @F003 VARCHAR( 20),
@F004 CHAR( @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
         testexpression2 @F002
         testexpression3 @F003
         testexpression4 @F004
5.循环(while)
While condition Begin
    statements End

6.动态定义游标
@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

@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
@RECCNT = @@ROWCOUNT

9.事务处理
BEGIN distributed transaction

WHILE @@TRANCOUNT > 0
        commit transaction
10.字符串连接
@m_sql + Where F001 = ''' ''''
F002 = CONVERT( varchar,0)">@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))
@asql ''
INSERT INTO #DMPARHED '
SELECT FMCD,FMNAM,MGYO1 FROM OPENQUERY(Lk_MDB_NEO32, '' SELECT FMCD,MGYO1 FROM DMPARHED 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
( from temp1
union
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
PROCEDURE name_produce
     @F001   VARCHAR( @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 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
@C001        VARCHAR( @C002        SMALLINT
EXEC name_produce @C001,0)">@C002 output

PROCEDURE dbo.getUserName
@UserID int,0)">@UserName varchar( 40) output
as
set nocount on
begin
if @UserID is null return
select @UserName =username
from dbo. userinfo where userid = @UserID
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 @F182,255)">set
       ,F001 @F181
       ,F002 @F003
14.Insert语句常见语法错误总结
INSERT INTO name_table(
,KEY_FIELD，BUSYOCD
) Values(
@F002
)
INTO name_table(
F001,F002
) Values(
,0)">@F002,
)
INSERT  name_table(
F001,0)">@F002 )

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