Spring+mybatis的一个简单例子
一、eclipse新建java项目取名SpringTest
二、倒入sping，mybatis,jdbc(这里用postgresql)包到构建路径
三、在psql中建库、建表的脚本。
CREATE DATABASE mymotif WITH OWNER = mymotif ENCODING = 'UTF8' TABLESPACE = mymotif_ts LC_COLLATE = 'zh_CN.UTF-8' LC_CTYPE = 'zh_CN.UTF-8' CONNECTION LIMIT = -1; CREATE TABLE student ( sno character(7) NOT NULL, sname character(8) NOT NULL, sex character(2) NOT NULL, bdate date, dir character(16), CONSTRAINT student_pkey PRIMARY KEY (sno) ) WITH ( OIDS=FALSE ); ALTER TABLE student OWNER TO mymotif;
四、创建java类
student表对应的pojo对象
package cn.itcast.mybatis.domain;
import java.sql.Date;
public class Student {
private String SNO;
private String SNAME;
private String SEX;
private Date BDATE;
private String DIR;
public Student() {
}
public Student(String id, String name, String sex,Date date , String dir) {
this.SNO = id;
this.SNAME = name;
this.SEX = sex;
this.DIR = dir;
this.BDATE=date;
}
public String getDIR() {
return DIR;
}
public void setDIR(String dir) {
this.DIR = dir;
}
public String getSNO() {
return SNO;
}
public void setSNO(String sno) {
this.SNO = sno;
}
public String getSNAME() {
return SNAME;
}
public void setSNAME(String name) {
this.SNAME = name;
}
public String getSEX() {
return SEX;
}
public void setSEX(String sEX) {
SEX = sEX;
}
public Date getBDATE() {
return BDATE;
}
public void setBDATE(Date bDATE) {
BDATE = bDATE;
}
@Override
public String toString() {
return "Student [sno=" + SNO + ", name=" + SNAME + ", sex=" + SEX+ ", birthday=" + BDATE
+ ", direction=" + DIR + "]";
}
}
映射文件cn/itcast/mybatis/domain/Student.xml（和pojo对象在一个包内）
<?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.itcast.mybatis.domain.Student">
<sql id="cols">
SNO,SNAME,SEX,BDATE,DIR
</sql>
<sql id="ucols">
SNO=#{SNO},SNAME=#{SNAME},SEX=#{SEX},BDATE=#{BDATE},DIR=#{DIR}
</sql>
<!-- 查询所有记录 -->
<select id="listAll" resultType="aliasesStudent">
select
<include refid="cols" />
from STUDENT
</select>
<!-- 按条件查询 -->
<select id="find" parameterType="aliasesStudent" resultType="aliasesStudent">
select * from STUDENT
<where>
<if test="SNAME!=null">
and name like "%"#{SNAME}"%"
</if>
<if test="BDATE!=null">
and age=#{BDATE}
</if>
<if test="DIR!=null">
and age=#{DIR}
</if>
</where>
</select>
<!-- 查询一个用户 -->
<select id="get" parameterType="string" resultType="aliasesStudent">
select
<include refid="cols" />
from STUDENT where SNO=#{SNO}
</select>
<!-- 新增 -->
<insert id="create" parameterType="aliasesStudent">
insert into STUDENT (SNO,SNAME,SEX,BDATE,DIR)
values(#{SNO},#{SNAME},#{SEX},#{BDATE},#{DIR})
</insert>
<!-- 修改 -->
<update id="update" parameterType="aliasesStudent">
update STUDENT
<set>
<if test="SNAME!=null">
SNAME=#{SNAME},
</if>
<if test="BDATE!=null">
BDATE=#{BDATE},
</if>
<if test="DIR!=null">
DIR=#{DIR},
</if>
</set>
where SNO=#{SNO}
</update>
<!-- 删除 -->
<delete id="delete" parameterType="string">
delete from STUDENT where SNO=#{SNO}
</delete>
</mapper>
对Student对象的访问接口及实现类
package cn.itcast.mybatis.dao;
import java.util.List;
import cn.itcast.mybatis.domain.Student;
public interface IStudentDao {
public List<Student> list();
public Student get(String SNO);
public int insert(Student S);
public int update(Student S);
public int deleteById(String SNO);
}
package cn.itcast.mybatis.dao;
import java.util.List;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import cn.itcast.mybatis.domain.Student;
public class StudentDaoImpl extends SqlSessionDaoSupport implements IStudentDao {
@Override
public List<Student> list() {
// TODO 自动生成的方法存根
return this.getSqlSession().selectList("cn.itcast.mybatis.domain.Student.listAll");
}
@Override
public Student get(String SNO) {
// TODO 自动生成的方法存根
return (Student) this.getSqlSession().selectOne("cn.itcast.mybatis.domain.Student.get", SNO);
}
@Override
public int insert(Student S) {
// TODO 自动生成的方法存根
return this.getSqlSession().insert("cn.itcast.mybatis.domain.Student.create", S);
}
@Override
public int update(Student S) {
// TODO 自动生成的方法存根
return this.getSqlSession().update("cn.itcast.mybatis.domain.Student.update",S);
}
@Override
public int deleteById(String SNO) {
// TODO 自动生成的方法存根
return this.getSqlSession().delete("cn.itcast.mybatis.domain.Student.delete",SNO);
}
}
五、配置文件
resources/psqlStudentMapConfig.xml
<?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> <typeAliases> <typeAlias type="cn.itcast.mybatis.domain.Student" alias="aliasesStudent"></typeAlias> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="org.postgresql.Driver"/> <property name="url" value="jdbc:postgresql:mymotif"/> <property name="username" value="mymotif"/> <property name="password" value="passwd"/> </dataSource> </environment> <!-- 产品 可用于多个配置的 --> <environment id="product"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="org.postgresql.Driver"/> <property name="url" value="jdbc:postgresql:mymotif"/> <property name="username" value="mymotif"/> <property name="password" value="passwd"/> </dataSource> </environment> </environments> <mappers> <mapper resource="cn/itcast/mybatis/domain/Student.xml"/> </mappers> </configuration>
resources/psql-beans.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- 数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="org.postgresql.Driver"></property> <property name="url" value="jdbc:postgresql:mymotif"></property> <property name="username" value="mymotif"></property> <property name="password" value="passwd"></property> </bean> <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:resources/psqlStudentMapConfig.xml"></property> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 事务相关控制 --> <bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <bean id="StudentDao" class="cn.itcast.mybatis.dao.StudentDaoImpl"> <property name="sqlSessionFactory" ref="sessionFactory"></property> </bean> </beans>
六、测试类
package cn.itcast.mybatis.test;
import java.util.List;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.itcast.mybatis.dao.IStudentDao;
import cn.itcast.mybatis.domain.Student;
public class TestpStudentMybatis {
/**
* @param args
*/
private static ApplicationContext cxt;
public static void main(String[] args) {
// TODO 自动生成的方法存根
cxt = new ClassPathXmlApplicationContext("resources/psql-beans.xml");
IStudentDao sd = (IStudentDao) cxt.getBean("StudentDao");
List<Student> students = sd.list();
System.out.println("STUDENT表的记录数为:" + students.size());
for (int i = 0; i < students.size(); i++)
System.out.println(students.get(i).toString());
}
}
运行结果：
数据库改为mysql，只需改变配置文件如下
<?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> <typeAliases> <typeAlias type="cn.itcast.mybatis.domain.Student" alias="aliasesStudent"></typeAlias> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mydb?characterEncoding=UTF-8"/> <property name="username" value="mymotif"/> <property name="password" value="passwd"/> </dataSource> </environment> <!-- 产品 可用于多个配置的 --> <environment id="product"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mydb?characterEncoding=UTF-8"/> <property name="username" value="mymotif"/> <property name="password" value="passwd"/> </dataSource> </environment> </environments> <mappers> <mapper resource="cn/itcast/mybatis/domain/Student.xml"/> </mappers> </configuration>