-- =============================================
--
--获取某张表中的总数据
-- @IntId: 条件 统计总数的关键字 int类型
-- @StrId: 条件 统计总数的关键字 字符串类型
-- @PrimaryKey: 统计总数的字段 字符串类型
-- @TableName 表名
-- =============================================
ALTER PROCEDURE P_GetOrderNumber
@cnt varchar(5) output,
@IntId int=0,
@StrId varchar(50)=NULL,
@TableName varchar(50),
@PrimaryKey varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @Sql NVARCHAR(2000)
IF @IntId <> 0
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='+@IntId+''
EXECUTE(@sql)
END
IF @StrId <> NULL
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='''+@StrId+''''
EXECUTE(@Sql)
END
SET NOCOUNT OFF;
END
GOdeclare @count varchar(5)
execute P_GetOrderNumber @IntId=1000,@TableName='AnswerLeMe',@PrimaryKey='lm_id',@StrId='0',@cnt=@count OUTPUT
print @count
但是返回的是一个空值
1 :普通SQL语句可以用Exec执行 eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名 declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确 3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中? declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num
@cnt varchar(5) output,
@IntId int=0,
@StrId varchar(50)=NULL,
@TableName varchar(50),
@PrimaryKey varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @Sql NVARCHAR(2000)
IF @IntId <> 0
BEGIN
SET @Sql='SELECT @cnt=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='+@IntId+''
sp_executesql @sql,N'@cnt int out',@cnt out
END
IF @StrId <> NULL
BEGIN
SET @Sql='SELECT @cnt=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='''+@StrId+''''
sp_executesql @sql,N'@cnt int out',@cnt out END
SET NOCOUNT OFF;
END
GO
-->
IF @StrId IS NOT NULL
--
--获取某张表中的总数据
-- @IntId: 条件 统计总数的关键字 int类型
-- @StrId: 条件 统计总数的关键字 字符串类型
-- @PrimaryKey: 统计总数的字段 字符串类型
-- @TableName 表名
-- =============================================
ALTER PROCEDURE P_GetOrderNumber
@cnt varchar(5) output,
@IntId int=0,
@StrId varchar(50)=NULL,
@TableName varchar(50),
@PrimaryKey varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @Sql NVARCHAR(2000)
IF @IntId <> 0
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='+@IntId+''
EXECUTE(@sql)
END
IF @StrId <> NULL
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='''+@StrId+''''
EXEC SP_EXECUTESQL @Sql, N'@cnt varchar(5) output', @cnt output
END
SET NOCOUNT OFF;
END
GO
@cnt int output,
@IntId int=0,
@StrId varchar(50)=NULL,
@TableName varchar(50),
@PrimaryKey varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @Sql NVARCHAR(2000)
declare @count int
IF @IntId <> 0
BEGIN
SET @Sql='SELECT @count=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='+@IntId+''
exec sp_executesql @sql,N'@count int output',@count=@cnt output;
END
IF @StrId <> NULL
BEGIN
SET @Sql='SELECT @count=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='''+@StrId+''''
exec sp_executesql @sql,N'@count int output',@count=@cnt output;
END
SET NOCOUNT OFF;
END
GO
将 nvarchar 值 'SELECT @count=count(*) from AnswerLeMe WHERE lm_id=' 转换为数据类型为 int 的列时发生语法错误。
@cnt varchar(5) output,
@IntId int=0,
@StrId varchar(50)=NULL,
@TableName varchar(50),
@PrimaryKey varchar(50)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @Sql NVARCHAR(2000)
IF @IntId <> 0
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='+Cast(@IntId as varchar)+''
EXECUTE(@sql)
END
IF @StrId <> NULL
BEGIN
SET @Sql='SELECT '+@cnt+'=count(*) from '+@TableName+' WHERE '+@PrimaryKey+'='''+@StrId+''''
EXECUTE(@Sql)
END
SET NOCOUNT OFF;
END
GO