MySQL语句正确插入多值如何运行?
以下的文章主要介绍的是MySQL语句正确插入多值的实际操作步骤,以及HQL多表查询及在条件 in 中插入N个变量值的实际操作,我前两天在相关网站看见的资料,觉得挺好,就拿出来供大家分享。 一条sql语句插入多组数据:insert into table values (id,name),(id,nam
以下的文章主要介绍的是MySQL语句正确插入多值的实际操作步骤,以及HQL多表查询及在条件 in 中插入N个变量值的实际操作,我前两天在相关网站看见的资料,觉得挺好,就拿出来供大家分享。
一条sql语句插入多组数据:insert into table values (id,name),(id,name),(id,name) 但似乎语句长度有限制,不能超过1MB,并且该语句是MySQL专用的写法,不是标准sql.
以下转自paradise总结的HQL多表查询的写法及in的使用:
HQL查询多表的时候,取出结果是两个对象的列表,但是我只要我自己想要的属性,之前的HQL语句是这样写的:
<ol class="dp-xml"><li class="alt"><span><span>from Hytxbz h,Tgbzk t where </span><span class="attribute">h.hytxbzid</span><span>=t.hytxbzid and </span><span class="attribute">t.bztgid</span><span>=:bztgid </span></span></li></ol>
结果我debug去看query.list();是Hytxbz和Tgbzk两个对象的列表,结果并不是我想要的,我改成
<ol class="dp-xml"><li class="alt"><span><span>from Hybztx h where h.hytxbzid in (select t.hytxbzid from Tgbzk where </span><span class="attribute">t.bztgid</span><span> =:bztgid) </span></span></li></ol>
还是不行,google一把,发现可以这样写
<ol class="dp-xml"><li class="alt"><span><span>select h from Hytxbz as h,Tgbzk as t where </span><span class="attribute">h.hytxbzid</span><span>=t.hytxbzid and </span><span class="attribute">t.bztgid</span><span>=:bztgid </span></span></li></ol>
如果想取得对应属性的话,也可以这样写
<ol class="dp-xml"><li class="alt"><span><span>select h.hytxbzid from Hytxbz as h,Tgbzk as t where </span><span class="attribute">h.hytxbzid</span><span>=t.hytxbzid and </span><span class="attribute">t.bztgid</span><span>=:bztgid </span></span></li></ol>
发现in的语句可以这样写
<ol class="dp-xml"> <li class="alt"><span><span>String ids[]=new String[]{"1","2","3"}; </span></span></li> <li> <span>String </span><span class="attribute">hql</span><span>= </span><span class="attribute-value">" from com,you.YourPOJO where id in (?)"</span><span>; </span> </li> <li class="alt"> <span>Query </span><span class="attribute">query</span><span> = </span><span class="attribute-value">session</span><span>.createQuery(hql); </span> </li> <li><span>query .setParameters(ids); </span></li> </ol>
相关方法:
<ol class="dp-xml"> <li class="alt"><span><span>Query setParameters(Object[] objectArray, Type[] typeArray) throws HibernateException; </span></span></li> <li><span>Query setParameterList(String string, Collection collection, Type type) throws HibernateException; </span></li> <li class="alt"><span>Query setParameterList(String string, Collection collection) throws HibernateException; </span></li> <li><span>Query setParameterList(String string, Object[] objectArray, Type type) throws HibernateException; </span></li> <li class="alt"><span>Query setParameterList(String string, Object[] objectArray) throws HibernateException </span></li> </ol>
以上的相关内容就是对MySQL语句插入多值的介绍,望你能有所收获。

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