MyBatis limit分页设置的实现

错误的写法：

<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：

<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）

<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：

@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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