目录
1.mybatis中大于等于小于等于的写法
2.mybatis动态查询条件组装
3.mybatis批量条件
4.mybatis时间查询实现分页总结
1.mybatis中大于等于小于等于的写法
第一种写法(1):
原符号 < <= > >= & ' "
替换符号 < <= > >= & ' "
例如:sql如下:
create_date_time >= #{startTime} and create_date_time <= #{endTime}
第二种写法(2):
大于等于
<![CDATA[ >= ]]>
小于等于
<![CDATA[ <= ]]>
例如:sql如下:
create_date_time <![CDATA[ >= ]]> #{startTime} and create_date_time <![CDATA[ <= ]]> #{endTime}
2.mybatis动态查询条件组装如下:
<!-- if(判断参数) - 将实体类不为空的属性作为where条件 -->
<select id="getStudentList_if" resultMap="resultMap_studentEntity" parameterType="liming.student.manager.data.model.StudentEntity">
SELECT ST.STUDENT_ID,
ST.STUDENT_NAME,
ST.STUDENT_SEX,
ST.STUDENT_BIRTHDAY,
ST.STUDENT_PHOTO,
ST.CLASS_ID,
ST.PLACE_ID
FROM STUDENT_TBL ST
WHERE
<if test="studentName !=null ">
ST.STUDENT_NAME LIKE CONCAT(CONCAT('%', #{studentName, jdbcType=VARCHAR}),'%')
</if>
<if test="studentSex != null and studentSex != '' ">
AND ST.STUDENT_SEX = #{studentSex, jdbcType=INTEGER}
</if>
<if test="studentBirthday != null ">
AND ST.STUDENT_BIRTHDAY = #{studentBirthday, jdbcType=DATE}
</if>
<if test="classId != null and classId!= '' ">
AND ST.CLASS_ID = #{classId, jdbcType=VARCHAR}
</if>
<if test="classEntity != null and classEntity.classId !=null and classEntity.classId !=' ' ">
AND ST.CLASS_ID = #{classEntity.classId, jdbcType=VARCHAR}
</if>
<if test="placeId != null and placeId != '' ">
AND ST.PLACE_ID = #{placeId, jdbcType=VARCHAR}
</if>
<if test="placeEntity != null and placeEntity.placeId != null and placeEntity.placeId != '' ">
AND ST.PLACE_ID = #{placeEntity.placeId, jdbcType=VARCHAR}
</if>
<if test="studentId != null and studentId != '' ">
AND ST.STUDENT_ID = #{studentId, jdbcType=VARCHAR}
</if>
</select>
3.mybatis批量条件
在Mybatis的xml配置中使用集合,主要是用到了foreach动态语句。foreach元素的属性主要有 item,index,collection,open,separator,close。item表示集合中每一个元素进行迭代时的别名,index指定一个名字,用于表示在迭代过程中,每次迭代到的位置,open表示该语句以什么开始,separator表示在每次进行迭代之间以什么符号作为分隔符,close表示以什么结束。
说明:以下示例关于MySQL数据库。由于**传入的参数是多个**,因此把它们封装成一个Map了,当然单参数也可以用Map。.xml文件的部分代码如下:
<update id="updateMessage" parameterType="java.util.Map"> update cx_customer_message set MODIFYTIME = SYSDATE() where MEMBERID = #{memberId, jdbcType=VARCHAR} and MESSAGE_CLASSIFY = #{messageClassify, jdbcType=VARCHAR} and MESSAGE_CODE in <foreach collection="messageCode" item="item" index="index" open="(" separator="," close=")"> #{item,jdbcType=VARCHAR} </foreach></update>
MessageMapper.Java
public interface MessageMapper{ //更新 public int updateMessage(Map<String, Object> message);}
MessageManager.java
public interface MessageManager { public int updateMessage(MessageReq messageReq); }
MessageManagerImpl.java
@Componentpublic class MessageManagerImpl implements MessageManager { @Autowired private MessageMapper messageMapper; @Override public int updateMessage(MessageReq messageReq) { int affectRows; Map<String, Object> message= new HashMap<String, Object>(); message.put("memberId", messageReq.getMemberId()); message.put("messageClassify",messageReq.getMessageClassify()); message.put("messageCode", messageReq.getMessageCode()); affectRows = messageMapper.updateDefualtMessage(message); return affectRows; } }
![](http://static.blog.csdn.net/images/save_snippets.png)
collection属性是必须指定的,在不同情况下该属性的值是不一样的:
如上述例子,传入的参数是多个时,collection属性值为传入List或array在**map里面的key**;传入的是单参数且参数类型是List时,collection属性值为list;传入的是单参数且参数类型array时,collection的属性值为array。
3.1mybatis批量插入
1. 在接口UserMapper中添加批量增加方法。
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/**
* 批量增加操作
* @param users
*/
public void batchInsertUsers(List<User> users);
2.在User.xml中添加批量增加操作的配置。
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<!-- 批量增加操作 -->
<insert id="batchInsertUsers" parameterType="java.util.List">
insert into mhc_user(userName,password) values
<foreach collection="list" item="item" index="index" separator=",">
(#{item.userName},#{item.password})
</foreach>
</insert>
由于批量增加的方法中参数为List,所以parameterType的值为[Java](http://lib.csdn.net/base/java).util.List。
3. 创建批量操作的工具类BatchDataUtils,编写批量增加方法。
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/**
* 批量增加操作
* @param users
*/
public static void batchInsertUsers(List<User> users){
SqlSessionFactory ssf = MyBatisUtil.getSqlSessionFactory();
SqlSession session = ssf.openSession();
try {
UserMapper userMapper = session.getMapper(UserMapper.class);
userMapper.batchInsertUsers(users);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
MyBatisUtil.closeSession(session);
}
}
3.2批量删除条件
**批量删除操作步骤**
1. 在接口UserMapper中添加删除增加方法。
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/**
* 批量删除操作
* @param ids
*/
public void batchDeleteUsers(List ids);
2.在User.xml中添加批量增加操作的配置。
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<!-- 批量删除操作 -->
<delete id="batchDeleteUsers" parameterType="java.util.List">
delete from mhc_user where id in
<foreach collection="list" index="index" item="item" open="(" close=")" separator=",">
#{item}
</foreach>
</delete>
由于批量删除的方法中参数为List,所以parameterType的值为java.util.List。
3. 在批量操作的工具类BatchDataUtils中编写批量删除方法。
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/**
* 批量删除操作
* @param ids
*/
public static void batchDeleteUsers(List ids){
SqlSessionFactory ssf = MyBatisUtil.getSqlSessionFactory();
SqlSession session = ssf.openSession();
try {
UserMapper userMapper = session.getMapper(UserMapper.class);
userMapper.batchDeleteUsers(ids);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
MyBatisUtil.closeSession(session);
}
}
3.3批量查询操作步骤
1. 在接口UserMapper中添加批量查询方法。
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/**
* 批量查询操作
* @param ids
* @return
*/
public List<User> batchSelectUsers(List ids);
2.在User.xml中添加批量查询操作的配置。
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<!-- 批量查询操作 -->
<select id="batchSelectUsers" resultType="User">
select *
from mhc_user where id in
<foreach collection="list" index="index" item="item" open="(" separator="," close=")">
#{item}
</foreach>
</select>
由于批量查询的方法的返回为List<User>,所以resultType的值为User,即com.mahaochen.mybatis.domain.User。详见configuration.xml中。
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<typeAliases>
<!-- 注册实体Bean -->
<typeAlias type="com.mahaochen.mybatis.domain.User" alias="User"/>
</typeAliases>
3. 创建批量操作的工具类BatchDataUtils,编写批量查询方法。
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/**
* 批量查询操作
* @param ids
* @return
*/
public static List<User> batchSelectUsers(List ids){
SqlSessionFactory ssf = MyBatisUtil.getSqlSessionFactory();
SqlSession session = ssf.openSession();
List<User> users = null;
try {
UserMapper userMapper = session.getMapper(UserMapper.class);
users = userMapper.batchSelectUsers(ids);
} catch (Exception e) {
e.printStackTrace();
} finally {
MyBatisUtil.closeSession(session);
}
return users;
}
}
3.4批量更细操作步骤
1. 在接口UserMapper中添加批量增加方法。
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/**
* 批量更新操作
* @param ids
*/
public void batchUpdateUsers(List users);
2.在User.xml中添加批量更新操作的配置。
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<!-- 批量更新操作 -->
<!-- FOR MySQL mysql需要数据库连接配置&allowMultiQueries=true
例如:jdbc:mysql://127.0.0.1:3306/mhc?allowMultiQueries=true -->
<update id="batchUpdateUsers" parameterType="java.util.List">
<foreach collection="list" item="item" index="index" open="" close="" separator=";">
update mhc_user
<set>
userName = #{item.userName}, password = #{item.password}
</set>
where id = #{item.id}
</foreach>
</update>
<!-- 【扩展知识】 FOR Oracle 有以下三种方式-->
<!-- 方式一 -->
<update id="batchUpdateUsers01" parameterType="java.util.List">
<foreach collection="list" item="item" index="index" open="begin" close=";end;" separator=";" >
update mhc_user
<set>
userName = #{item.userName}, password = #{item.password}
</set>
where id = #{item.id}
</foreach>
</update>
<!-- 方式二 -->
<update id="batchUpdateUsers02" parameterType="java.util.List">
<foreach collection="list" item="item" index="index" open="begin" close="end;" separator="" >
update mhc_user
<set>
userName = #{item.userName}, password = #{item.password}
</set>
where id = #{item.id};
</foreach>
</update>
<!-- 方式三 -->
<update id="batchUpdateUsers03" parameterType="java.util.List">
begin
<foreach collection="list" item="item" index="index" separator="" >
update mhc_user
<set>
userName = #{item.userName}, password = #{item.password}
</set>
where id = #{item.id};
</foreach>
end;
</update>
由于批量更新的方法中参数为List,所以parameterType的值为java.util.List。
3. 创建批量操作的工具类BatchDataUtils,编写批量更新方法。
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/**
* 批量更新操作
* @param users
*/
public static void batchUpdateUsers(List users){
SqlSessionFactory ssf = MyBatisUtil.getSqlSessionFactory();
SqlSession session = ssf.openSession();
try {
UserMapper userMapper = session.getMapper(UserMapper.class);
userMapper.batchUpdateUsers(users);
session.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
MyBatisUtil.closeSession(session);
}
}
4mybatis分页查询实现总结
4.1分页实现根据时间的范围
<!-- param_where_query 查询条件 -->
<sql id="param_where_query">
<trim prefix="(" suffix=")" prefixOverrides="and">
<!-- 自增主键 -->
<if test="id != null">
and id in
<foreach item="item" index="index" collection="id" open="("
separator="," close=")">#{item}</foreach>
</if>
<!-- memberId -->
<if test="memberId != null">
and member_id in
<foreach item="item_member" index="index" collection="memberId" open="(" separator="," close=")">#{item_member}</foreach>
</if>
<!-- 手机号 -->
<if test="mobile != null">
and mobile = #{mobile}
</if>
<!-- 公司名称 -->
<if test="companyName != null">
and company_name like CONCAT('%',#{companyName},'%')
</if>
<!-- 公司名称全称 -->
<if test="fullCompanyName != null">
and company_name = #{fullCompanyName}
</if>
<!-- 池类型(1:会员池,2:客户池) -->
<if test="type != null">
and type = #{type}
</if>
<!-- 起始时间 -->
<if test="startPoolCreate != null">
and pool_create >= #{startPoolCreate}
</if>
<!-- 结束时间 -->
<if test="endPoolCreate != null">
and pool_create <= #{endPoolCreate}
</if>
</trim>
</sql>
<select id="query" parameterType="com.wuage.clm.param.ClmPoolParam"
resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from clm_pool
<where>
<include refid="param_where_query" />
</where>
order by id desc
limit #{startNum}, #{pageSize}
</select>
入参的类型中的时间处理
4.2查询出数据后的根据count进行分页
int totalPage =0,pageSize=10;
int count= clmCirculationRes.getCount();
totalPage = (count+ pageSize - 1) / pageSize;