如果使用MyBatis注解方式写sql，又想要XML写法的判断入参拼接条件，可以通过@SelectProvider方式实现。

新建Provider

public class RateProvider {

private final String table_name = "rate_finish";

public String getFinishRate(Map para) {

String sql = "SELECT homework_type,device_type,`level`,finish_count,count,create_at FROM rate_finish ";

sql += "WHERE 1=1 ";

if (para.get("deviceType") != null && !StringUtils.isEmpty(para.get("deviceType").toString())) {

sql += "AND device_type = '" + para.get("deviceType").toString() + "' ";

}

if (para.get("homeworkType") != null && !StringUtils.isEmpty(para.get("homeworkType").toString())) {

sql += "AND homework_type = '" + para.get("homeworkType").toString() + "' ";

}

if (para.get("date") != null && !StringUtils.isEmpty(para.get("date").toString())) {

sql += "AND create_at = '" + para.get("date").toString() + "' ";

}

sql += "ORDER BY homework_type,device_type,`level`";

return sql;

}

}

这里的para会包含6个值，也就是2倍的入参参数，可以通过key方式或者index方式获取对应参数。

新建Entity

public class RateFinish extends AbstractModel {

private int id;

private String deviceType;

private String level;

private String finishCount;

private String count;

private String homeworkType;

private String createAt;

编写Mapper方法

@SelectProvider(type = RateProvider.class, method = "getFinishRate")

@Results({

@Result(property = "homeworkType", column = "homework_type"),

@Result(property = "deviceType", column = "device_type"),

@Result(property = "level", column = "level"),

@Result(property = "finishCount", column = "finish_count"),

@Result(property = "count", column = "count"),

@Result(property = "createAt", column = "create_at")

})

List getFinishRate(

@Param("deviceType") String deviceType,

@Param("homeworkType") String homeworkType,

@Param("date") String date);