sql语句拼接
sql语句拼接主要操作于有条件的的增加，删除，修改或查询，下面给你介绍一个条件查询的例子：既然是拼接sql语句长度不一定，用StringBuffer修饰，而不用StringString name=request.getParameter(name);String address=request.getParemeter(address);StringBuffer sql = new StringBuffer();sql.append(select * from Tuser as t where 1=1);if(name!=null||!.equals(name)){ sql.append( and t.name like'%+name+%');}if(address!=null||!.equals(address)){ sql.append( and t.address like'%+address+%');}以上就是拼接sql语句，也就是说select * from Tuser as t where 1=1一定会执行，而后面两个会根据用户数据参数选择执行我可是手写的啊，没有复制，明白了吗
不明了再问我，明白了就给分吧，嘿嘿
关于aspsql语句拼接
sql语句拼接主要操作于条件增加删除修改或查询面给介绍条件查询例：既拼接sql语句度定用StringBuffer修饰用StringString name=request.getParameter(name);String address=request.getParemeter(address);StringBuffer sql = new StringBuffer();sql.append(select * from Tuser as t where 1=1);if(name!=null||!.equals(name)){ sql.append( and t.name like'%+name+%');}if(address!=null||!.equals(address)){ sql.append( and t.address like'%+address+%');}拼接sql语句说select * from Tuser as t where 1=1定执行面两根据用户数据参数选择执行我手写啊没复制明白明再问我明白给吧嘿嘿
SQL 复杂的拼接语句的语法有些什么
select column from table [where ... ]select - 关健字 必须column 字段名,必须.最少一个.全部则用*号代替.from - 关健字 必须table 表名 必须where 条件.如果查全部记录,则不需要.其实大部分情况下都需要的.
两个sql语句拼接
select m.khmc,m.djr,m.bfrq, m.bfr,m.bfmd,m.fkqk from formtable_main_32 m ,(select id,mc,gjc from (select id,mc mc,ywgjz gjc from formtable_main_23 where cyfl = 4 unionselect id,tzr mc,tzrxssjg gjc from formtable_main_23 where cyfl = 0 unionselect id,Yfjsfzr mc,Yfxx gjc from formtable_main_23 where cyfl = 1 unionselect id,Lshi mc,Lsuo gjc from formtable_main_23 where cyfl = 2 unionselect a.id,Rczw mc,b.selectname gjc from formtable_main_23 a left join workflow_SelectItem b on a.Rchy = b.selectvalue where cyfl = 3 and fieldid = 6212) as tmp) tm where m.id=tm.id