动软代码生成器分页存储过程

Posted 2020-11-02 大漠孤烟直

1、定义动软代码生成器分页存储过程

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--用途：分页存储过程(对有主键的表效率极高) 
--说明：
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CREATE PROCEDURE [dbo].[UP_GetRecordByPage]
    @tblName      varchar(255),       -- 表名
    @fldName      varchar(255),       -- 主键字段名
    @PageSize     int = 10,           -- 页尺寸
    @PageIndex    int = 1,            -- 页码
    @IsReCount    bit = 0,            -- 返回记录总数, 非 0 值则返回
    @OrderType    bit = 0,            -- 设置排序类型, 非 0 值则降序
    @strWhere     varchar(1000) = ‘‘, -- 查询条件 (注意: 不要加 where)
    @totalNum int output
AS

declare @strSQL   varchar(6000)       -- 主语句
declare @strTmp   varchar(100)        -- 临时变量(查询条件过长时可能会出错，可修改100为1000)
declare @strOrder varchar(400)        -- 排序类型

if @OrderType != 0
begin
    set @strTmp = ‘<(select min‘
    set @strOrder = ‘ order by [‘ + @fldName +‘] desc‘
end
else
begin
    set @strTmp = ‘>(select max‘
    set @strOrder = ‘ order by [‘ + @fldName +‘] asc‘
end

set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ * from [‘
    + @tblName + ‘] where [‘ + @fldName + ‘]‘ + @strTmp + ‘([‘
    + @fldName + ‘]) from (select top ‘ + str((@PageIndex-1)*@PageSize) + ‘ [‘
    + @fldName + ‘] from [‘ + @tblName + ‘]‘ + @strOrder + ‘) as tblTmp)‘
    + @strOrder

if @strWhere != ‘‘
    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ * from [‘
        + @tblName + ‘] where [‘ + @fldName + ‘]‘ + @strTmp + ‘([‘
        + @fldName + ‘]) from (select top ‘ + str((@PageIndex-1)*@PageSize) + ‘ [‘
        + @fldName + ‘] from [‘ + @tblName + ‘] where ‘ + @strWhere + ‘ ‘
        + @strOrder + ‘) as tblTmp) and ‘ + @strWhere + ‘ ‘ + @strOrder

if @PageIndex = 1
begin
    set @strTmp =‘‘
    if @strWhere != ‘‘
        set @strTmp = ‘ where ‘ + @strWhere

    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ * from [‘
        + @tblName + ‘]‘ + @strTmp + ‘ ‘ + @strOrder
end

 --获取记录总数
DECLARE @strCountSql NVARCHAR(1000);
SET @strCountSql = ‘Select @RecordCount = count(1) FROM ‘+@tblName+‘ WHERE 1 = 1 ‘ + @strWhere
EXEC sp_executesql @strCountSql, N‘@RecordCount int OUTPUT‘, @totalNum OUTPUT

exec (@strSQL)

GO

 

2、书写时应注意的点

(1) 定义@strWhere变量后，应及时初始化。

(2) 拼接SQL条件时，应注意用‘‘包括字段值。

(3) 应把时间变量转换成特定格式的字符串

(4) EXEC()

(5) EXEC sp_executesql