mysql之instr函数

1.用于模糊查询，做为过滤条件

---------------------------上级的新闻下级可以看到-------------------------
SELECT a.pk_cms_nrgl_st AS pk_id, a.time_stamp AS time_stamp, b.xalljgmc AS xalljgmc, a.cbt AS cbt, a.fk_cms_lmgl AS fk_cms_lmgl, a.cfbsj AS cfbsj, a.czt AS czt, a.cbody AS cbody, a.sys_xzqh AS sys_xzqh, a.sys_djzt AS sys_djzt, a.sys_djztms AS sys_djztms, a.sys_spzt AS sys_spzt, a.sys_spzt AS sys_spztmc, a.sys_spztms AS sys_spztms, a.sys_shrid AS sys_shrid, a.sys_shr AS sys_shr, a.sys_shrq AS sys_shrq, a.sys_xgrid AS sys_xgrid, a.sys_xgr AS sys_xgr, a.sys_xgrq AS sys_xgrq, a.sys_zdrid AS sys_zdrid, a.sys_zdr AS sys_zdr, a.sys_zdrq AS sys_zdrq FROM cms_nrgl_st a, mz_xzjg b WHERE a.sys_xzqh=b.xzqh_id AND a.sys_scbj = '0' AND INSTR('330101', b.node_id) > 0 AND a.sys_spzt = 1 ORDER BY time_stamp desc, cfbsj desc limit 0, 20

配置

<where name="user.xnode"  code="b.node_id"  datatype="string" attribute="true" scope="session" opersign="instrcode" link="AND" />

2.以下代码等同上面的，用了concat做拼接

SELECT a.pk_cms_nrgl_st AS pk_id, a.time_stamp AS time_stamp, b.xalljgmc AS xalljgmc, a.cbt AS cbt, a.fk_cms_lmgl AS fk_cms_lmgl, a.cfbsj AS cfbsj, a.czt AS czt, a.cbody AS cbody, a.sys_xzqh AS sys_xzqh, a.sys_djzt AS sys_djzt, a.sys_djztms AS sys_djztms, a.sys_spzt AS sys_spzt, a.sys_spzt AS sys_spztmc, a.sys_spztms AS sys_spztms, a.sys_shrid AS sys_shrid, a.sys_shr AS sys_shr, a.sys_shrq AS sys_shrq, a.sys_xgrid AS sys_xgrid, a.sys_xgr AS sys_xgr, a.sys_xgrq AS sys_xgrq, a.sys_zdrid AS sys_zdrid, a.sys_zdr AS sys_zdr, a.sys_zdrq AS sys_zdrq FROM cms_nrgl_st a, mz_xzjg b WHERE a.sys_xzqh=b.xzqh_id AND a.sys_scbj = '0' and a.sys_spzt = 1
AND '33' LIKE concat(b.node_id,'%') ORDER BY time_stamp desc, cfbsj desc limit 0, 20