错误的写法：
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<select id="queryMyApplicationRecord" parameterType="MyApplicationRequest" resultMap="myApplicationMap"> SELECT a.*, FROM tb_user a WHERE 1=1 <if test="ids != null and ids.size()!=0"> AND a.id IN <foreach collection="ids" item="id" index="index" open="(" close=")" separator=","> #{id} </foreach> </if> <if test="statusList != null and statusList.size()!=0"> AND a.status IN <foreach collection="statusList" item="status" index="index" open="(" close=")" separator=","> #{status} </foreach> </if> ORDER BY a.create_time desc LIMIT (#{pageNo}-1)*#{pageSize},#{pageSize}; // 错误</select> |
在MyBatis中LIMIT之后的语句不允许的变量不允许进行算数运算，会报错。
正确的写法一：
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<select id="queryMyApplicationRecord" parameterType="MyApplicationRequest" resultMap="myApplicationMap"> SELECT a.*, FROM tb_user a WHERE 1=1 <if test="ids != null and ids.size()!=0"> AND a.id IN <foreach collection="ids" item="id" index="index" open="(" close=")" separator=","> #{id} </foreach> </if> <if test="statusList != null and statusList.size()!=0"> AND a.status IN <foreach collection="statusList" item="status" index="index" open="(" close=")" separator=","> #{status} </foreach> </if> ORDER BY a.create_time desc LIMIT ${(pageNo-1)*pageSize},${pageSize}; （正确）</select> |
正确的写法二：（推荐）
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<select id="queryMyApplicationRecord" parameterType="MyApplicationRequest" resultMap="myApplicationMap"> SELECT a.*, FROM tb_user a WHERE 1=1 <if test="ids != null and ids.size()!=0"> AND a.id IN <foreach collection="ids" item="id" index="index" open="(" close=")" separator=","> #{id} </foreach> </if> <if test="statusList != null and statusList.size()!=0"> AND a.status IN <foreach collection="statusList" item="status" index="index" open="(" close=")" separator=","> #{status} </foreach> </if> ORDER BY a.create_time desc LIMIT #{offSet},#{limit}; （推荐，代码层可控）</select> |
分析：方法二的写法，需要再请求参数中额外设置两个get函数，如下：
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@Datapublic class QueryParameterVO { private List<String> ids; private List<Integer> statusList; // 前端传入的页码 private int pageNo; // 从1开始 // 每页的条数 private int pageSize; // 数据库的偏移 private int offSet; // 数据库的大小限制 private int limit; // 这里重写offSet和limit的get方法 public int getOffSet() { return (pageNo-1)*pageSize; } public int getLimit() { return pageSize; }} |
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原文链接：https://blog.csdn.net/timchen525/article/details/79647666
