mybatis mapper.xml 区间查询条件
对 null 和 ” 分开进行判断
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< select id = "selectByExample" resultMap = "BaseResultMap" parameterType = "com.test.entity.TestQuery" >
SELECT
*
FROM
test s
WHERE 1=1
<!-- 创建时间 -->
< if test = "createTime!=null and createTime!=''" >
AND s.create_time = #{createTime,jdbcType=TIMESTAMP}
</ if >
<!-- 开始创建时间,结束创建时间都不为空 -->
< if test = "beginCreateTime!=null and beginCreateTime!='' and endCreateTime!=null and endCreateTime!=''" >
AND s.create_time >= #{beginCreateTime,jdbcType=TIMESTAMP}
AND s.create_time <= #{endCreateTime,jdbcType=TIMESTAMP}
</ if >
<!-- 开始不为空,结束为空 null -->
< if test = "beginCreateTime!=null and beginCreateTime!='' and endCreateTime==null" >
AND s.create_time >= #{beginCreateTime,jdbcType=TIMESTAMP}
</ if >
<!-- 开始不为空,结束为空 '' -->
< if test = "beginCreateTime!=null and beginCreateTime!='' and endCreateTime==''" >
AND s.create_time >= #{beginCreateTime,jdbcType=TIMESTAMP}
</ if >
<!-- 开始为空 null,结束不为空 -->
< if test = "beginCreateTime==null and endCreateTime!=null and endCreateTime!=''" >
AND s.create_time <= #{endCreateTime,jdbcType=TIMESTAMP}
</ if >
<!-- 开始为空 '',结束不为空 -->
< if test = "beginCreateTime=='' and endCreateTime!=null and endCreateTime!=''" >
AND s.create_time <= #{endCreateTime,jdbcType=TIMESTAMP}
</ if >
</ select >
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tk mybatis通用mapper,复杂and or条件查询
需求:where查询,需要支持(a or b or c) and d
也就是a、b、c三个条件是或的关系,然后再与d相与。
尝试后,可以通过以下方式处理:
方式1:Weekend语法
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Weekend<User> weekend = new Weekend<>(User. class );
//关键字查询部分
String keyword = pageReq.getKeyword();
WeekendCriteria<User, Object> keywordCriteria = weekend.weekendCriteria();
if (StringUtils.isNotEmpty(keyword)) {
keywordCriteria.orLike(User::getUserName, keyword).orLike(User::getPoliceNo, keyword).orLike(User::getRealName, keyword);
//此处不需要再用下面这一句了,不然上面这个条件组合会重复一次
//weekend.and(keywordCriteria)
}
//部门查询部分
Example example = new Example(User. class );
Example.Criteria criteria = example.createCriteria();
criteria.andEqualTo( "departmentId" , departmentId);
weekend.and(criteria);
PageHelper.startPage(pageReq.getPageIndex(), pageReq.getPageSize());
List<User> users = userMapper.selectByExample(weekend);
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ps:上面,其中Weekend是高版本的通用mapper版本才有,而且需要java8语法支持。
方式2:通用example语法
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Example e = new Example(User. class );
Example.Criteria c = e.createCriteria();
//关键字查询部分
String keyword = pageReq.getKeyword();
if (StringUtils.isNotEmpty(keyword)) {
c.orEqualTo( "userName" , keyword).orEqualTo( "policeNo" ,keyword).orEqualTo( "realName" ,keyword);
}
//部门查询部门
Example.Criteria criteria = e.createCriteria();
criteria.andEqualTo( "departmentId" , departmentId);
e.and(criteria);
PageHelper.startPage(pageReq.getPageIndex(), pageReq.getPageSize());
List<User> users = userMapper.selectByExample(e);
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执行的sql为:
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WHERE (
user_name = ?
OR police_no = ?
OR real_name = ?
)
AND (department_id = ?)
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总结下来,就是,
每个条件组合(a/b/c) (d)各自创建自己的cirteria,再用and或者or方法去连接
以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/tengdazhang770960436/article/details/56840666