存儲(chǔ)過程優(yōu)化的SQL語句寫法
如果需要讓SQL數(shù)據(jù)庫中的事務(wù)和存儲(chǔ)過程優(yōu)化，SQL語句應(yīng)該如何寫呢？下面就將為您介紹存儲(chǔ)過程優(yōu)化的SQL語句寫法，希望對您學(xué)習(xí)SQL語句的使用有所幫助。
判斷插入值是否重復(fù)：
事務(wù)和存儲(chǔ)過程優(yōu)化
CREATE PROCEDURE IR_rb_User_UpdateUser
(
@UserID int,
@Name nvarchar(50),
@Email nvarchar(100),
@Password nvarchar(20),
@RoleID int,
@iSuccess int output
)
AS
set @iSuccess = -1 --判斷是否成功有錯(cuò)誤應(yīng)為插入重復(fù)鍵
IF EXISTS (SELECT Email FROM rb_Users WHERE Email = @Email and UserID<>@UserID)
BEGIN
set @iSuccess = -2
return
END
BEGIN TRAN
UPDATE rb_Users SET Name = @Name, Email = @Email, Password = @Password WHERE UserID = @UserID
IF @@ERROR <> 0
BEGIN
ROLLBACK TRAN
return
END
set @iSuccess = -3
update rb_UserRoles set RoleID=@RoleID where UserID=@UserID
IF @@ERROR <> 0
BEGIN
ROLLBACK TRAN
return
END
COMMIT TRAN
set @iSuccess = 1
GO
條件查詢語句：
條件查詢直接放在SQL中判斷
CREATE PROCEDURE IR_SysAuthorization_GetAllSysAuthorization
(
@Type int,
@UserID varchar(20)
)
AS
declare @strsql varchar(1500) --臨時(shí)sql語句
declare @strwhere varchar(1000) --臨時(shí)sql的條件語句
set @strsql = ''
set @strsql = @strsql + 'select UserID,Role,(select typename from SysAuthorizationType where type=t.type) as typeTmp, '
set @strsql = @strsql + '(CASE WHEN State = 1 THEN ' + '''有效''' + ' ELSE ' + '''無效''' + ' END) AS StateTmp '
set @strsql = @strsql + 'FROM SysAuthorization t '
set @strwhere = ''
IF @UserID <> ''
BEGIN
set @strwhere = @strwhere + ' and (UserID LIKE ' + '''' + '%' + @UserID + '%' + '''' + ')'
END
IF @Type >0
BEGIN
set @strwhere = @strwhere + ' and Type = ' + CAST(@Type AS varchar(12))
END
if @strwhere <>''
BEGIN
set @strsql = @strsql + ' where ' + right(@strwhere, len(@strwhere)-4)
END
--按用戶名排序
set @strsql = @strsql + ' ORDER BY Type,UserID'
exec (@strsql)
GO
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