时间：2021-07-01 10:21:17 帮助过：4人阅读
初学mybatis分页查询；包括无条件分页和有条件分页
Student.java
package cn.buaa.mybatis.app3;
public class Student {
private Integer id;
private String name;
private Double sal;
public Student(Integer id, String name, Double sal) {
super();
this.id = id;
this.name = name;
this.sal = sal;
}
public Student() {
super();
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getSal() {
return sal;
}
public void setSal(Double sal) {
this.sal = sal;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", sal=" + sal + "]";
}
}
StudentDao.java
package cn.buaa.mybatis.app3;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.session.SqlSession;
import cn.buaa.mybatis.util.MybatisUtil;
/**
* 持久层
*
* @author 梧桐下的茵
*
*/
public class StudentDao {
/**
* 增加学生
*/
public void add(Student student) throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = MybatisUtil.getSqlSession();
sqlSession.insert(Student.class.getName() + ".add", student);
// 事物提交
sqlSession.commit();
} catch (Exception e) {
e.printStackTrace();
sqlSession.rollback();
throw e;
} finally {
MybatisUtil.closeSqlSession();
}
}
/**
* 无条件分页
*/
public List<Student> findAllWithFy(int start,int size) throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = MybatisUtil.getSqlSession();
Map<String,Object> map = new LinkedHashMap<String,Object>();
map.put("pstart", start);
map.put("psize", size);
List<Student> studentList = sqlSession.selectList(Student.class.getName() + ".findAllWithFy", map);
return studentList;
} catch (Exception e) {
e.printStackTrace();
throw e;
} finally {
MybatisUtil.closeSqlSession();
}
}
/**
* 有条件分页
*/
public List<Student> findAllByNameWithFy(String name,int start,int size) throws Exception {
SqlSession sqlSession = null;
try {
sqlSession = MybatisUtil.getSqlSession();
Map<String,Object> map = new LinkedHashMap<String,Object>();
map.put("pname", "%"+name+"%");
map.put("pstart", start);
map.put("psize", size);
List<Student> studentList = sqlSession.selectList(Student.class.getName() + ".findAllByNameWithFy", map);
return studentList;
} catch (Exception e) {
e.printStackTrace();
throw e;
} finally {
MybatisUtil.closeSqlSession();
}
}
// 测试
public static void main(String[] args) throws Exception {
StudentDao dao = new StudentDao();
/*for (int i = 1; i < 11; i++) {
dao.add(new Student(i, "呵呵", 7000D));
}*/
System.out.println("---------------第一页--------------");
List<Student> studentList = dao.findAllByNameWithFy("呵",0, 3);
for(Student student :studentList){
System.out.println(student.toString());
}
System.out.println("---------------第二页--------------");
List<Student> studentList2 = dao.findAllByNameWithFy("呵",3, 3);
for(Student student :studentList2){
System.out.println(student.toString());
}
System.out.println("---------------第三页--------------");
List<Student> studentList3= dao.findAllByNameWithFy("呵",6, 3);
for(Student student :studentList3){
System.out.println(student.toString());
}
System.out.println("---------------第四页--------------");
List<Student> studentList4= dao.findAllByNameWithFy("呵",9, 3);
for(Student student :studentList4){
System.out.println(student.toString());
}
}
}
studentMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.buaa.mybatis.app3.Student">
<resultMap type="cn.buaa.mybatis.app3.Student" id="studentMap">
<id property="id" column="t_id"/>
<result property="name" column="t_name"/>
<result property="sal" column="t_sal"/>
</resultMap>
<insert id="add" parameterType="cn.buaa.mybatis.app3.Student" >
insert into students (t_id,t_name,t_sal) values(#{id},#{name},#{sal})
</insert>
<!-- 无条件查询-->
<select id="findAllWithFy" parameterType="map" resultMap="studentMap">
select t_id,t_name,t_sal from students
limit #{pstart},#{psize}
</select>
<!-- 有条件查询-->
<select id="findAllByNameWithFy" parameterType="map" resultMap="studentMap">
select t_id,t_name,t_sal from students
where t_name like #{pname}
limit #{pstart},#{psize}
</select>
</mapper><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 加载类路径下的属性文件 -->
<properties resource="db.properties"/>
<!-- 设置类型别名 -->
<typeAliases >
<typeAlias type="cn.buaa.mybatis.app1.Student" alias="student"/>
</typeAliases>
<!-- 设置默认的连接环境信息 -->
<environments default="mysql_developer">
<!-- 连接环境信息 ，随便起一个唯一的名字 -->
<environment id="mysql_developer">
<!-- mybatis使用jdbc事物管理方式 -->
<transactionManager type="jdbc"></transactionManager>
<!-- mybatis使用连接池方式来获取连接 -->
<dataSource type="pooled">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/emp"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
<!-- 连接环境信息 ，随便起一个唯一的名字 -->
<environment id="oracle_developer">
<!-- mybatis使用jdbc事物管理方式 -->
<transactionManager type="jdbc"></transactionManager>
<!-- mybatis使用连接池方式来获取连接 -->
<dataSource type="pooled">
<property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@localhost:1521/orcl"/>
<property name="username" value="zhangdong"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!-- 加载映射文件-->
<mappers>
<mapper resource="cn/buaa/mybatis/app1/studentMapper.xml"/>
<mapper resource="cn/buaa/mybatis/app2/studentMapper.xml"/>
<mapper resource="cn/buaa/mybatis/app3/studentMapper.xml"/>
</mappers>
</configuration>mysql.driver=com.mysql.jdbc.Driver mysql.url=jdbc:mysql://127.0.0.1:3306/emp mysql.username=root mysql.password=123456 oracle.driver=oracle.jdbc.driver.OracleDriver oracle.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl oracle.username=root oracle.password=123456
mybatis分页的实现（mysql）
标签：