MyBatis limit分頁設置的實現

<select 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}; // 錯誤</select>

在MyBatis中LIMIT之后的語句不允許的變量不允許進行算數運算，會報錯。

<select 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}; （正確）</select> 正確的寫法二：（推薦）

<select 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}; （推薦，代碼層可控）</select>

分析：方法二的寫法，需要再請求參數中額外設置兩個get函數，如下：

@Datapublic class QueryParameterVO { private List<String> ids; private List<Integer> statusList; // 前端傳入的頁碼 private int pageNo; // 從1開始 // 每頁的條數 private int pageSize; // 數據庫的偏移 private int offSet; // 數據庫的大小限制 private int limit; // 這里重寫offSet和limit的get方法 public int getOffSet() { return (pageNo-1)*pageSize; } public int getLimit() { return pageSize; }}

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