MyBatis (一)
一，测试项目结构图
二，数据库、表的建立
#sequence create sequence s_user minvalue 1 start with 1 increment by 1 nocache; #table create table t_user( id int, userName varchar2(30) constraint u_user_userName unique, password varchar2(80), description varchar2(250), constraint p_user_id primary key(id) ); #trigger 设置初始密码以及id自增 create or replace trigger tr_user before insert on t_user for each row declare nextid int; pwd varchar2(80) default 'happymzw'; begin if :new.id is null or :new.id=0 then select s_user.nextval into nextid from dual; :new.id:=nextid; end if; if :new.password is null then :new.password:=pwd; end if; end tr_user;
三，JAVA代码
1，db.properties
# db config db.driver=oracle.jdbc.driver.OracleDriver db.url=jdbc:oracle:thin:@localhost:1521:orcl db.username=happymzw db.password=happymzw
2，MyBatis-Configuration.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>
<properties resource="db.properties" />
<settings>
<!-- 处理传入参数为空 -->
<setting name="jdbcTypeForNull" value="NULL"/>
</settings>
<typeAliases>
<package name="org.happymzw.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${db.driver}" />
<property name="url" value="${db.url}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="org/happymzw/mapper/UserMapper.xml"/>
</mappers>
</configuration>
3，org.happymzw.pojo.User
package org.happymzw.pojo;
/**
* @author victor.min
*
*/
public class User{
private int id;
private String userName;
private String password;
private String description;
/**
* @return the id
*/
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(final int id) {
this.id = id;
}
/**
* @return the userName
*/
public String getUserName() {
return userName;
}
/**
* @param userName the userName to set
*/
public void setUserName(final String userName) {
this.userName = userName;
}
/**
* @return the password
*/
public String getPassword() {
return password;
}
/**
* @param password the password to set
*/
public void setPassword(final String password) {
this.password = password;
}
/**
* @return the description
*/
public String getDescription() {
return description;
}
/**
* @param description the description to set
*/
public void setDescription(final String description) {
this.description = description;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
final StringBuilder builder = new StringBuilder();
builder.append("User [id=");
builder.append(id);
builder.append(", userName=");
builder.append(userName);
builder.append(", password=");
builder.append(password);
builder.append(", description=");
builder.append(description);
builder.append("]");
return builder.toString();
}
}
4，org.happymzw.dao.UserDao
package org.happymzw.dao;
import java.util.List;
import org.happymzw.pojo.User;
/**
* @author victor.min
*
*/
public interface UserDao{
public int insert(User user);
public int delete(String userName);
public int update(User user);
public List<User> selectAll();
public int countAll();
public User findByUserName(String userName);
}
5，org.happymw.mapper.UserMapper.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="org.happymzw.dao.UserDao">
<insert id="insert" parameterType="User">
insert into t_user values(#{id}, #{userName}, #{password}, #{description})
</insert>
<delete id="delete" parameterType="String" >
delete from t_user where userName=#{userName}
</delete>
<update id="update" parameterType="User">
update t_user set userName=#{userName},password=#{password},description=#{description} where id=#{id}
</update>
<select id="countAll" resultType="int">
select count(1) from t_user
</select>
<select id="selectAll" resultType="User">
select * from t_user
</select>
<select id="findByUserName" parameterType="String" resultType="User">
select * from t_user where userName=#{userName}
</select>
</mapper>
6，org.happymzw.test.UserDaoTest
package org.happymzw.test;
import java.io.Reader;
import java.util.Iterator;
import java.util.List;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.happymzw.dao.UserDao;
import org.happymzw.pojo.User;
import org.junit.Test;
/**
* @author victor.min
*
*/
public class UserDaoTest {
@Test
public void userDaoTest() throws Exception {
final String resource = "MyBatis-Configuration.xml";
final Reader reader = Resources.getResourceAsReader(resource);
final SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
final SqlSessionFactory factory = builder.build(reader);
final SqlSession session = factory.openSession();
final UserDao userDao = session.getMapper(UserDao.class);
// final User user = new User();
// user.setId(7);
// user.setUserName("happymzw2");
// user.setPassword("123456");
// user.setDescription("备注");
//
// userDao.insert(user);
// System.out.println("记录条数："+userDao.countAll());
// user.setDescription("Description");
// userDao.update(user);
// final User u1 = userDao.findByUserName("happymzw2");
// System.out.println(u1.toString());
userDao.delete("happymzw2");
System.out.println("记录条数："+userDao.countAll());
final List<User> users = userDao.selectAll();
final Iterator<User> iter = users.iterator();
while(iter.hasNext()){
final User u = iter.next();
System.out.println("ID: " + u.getId()
+ ", 用户名：" + u.getUserName()
+ ", 密码：" + u.getPassword()
+ ", 备注: " + u.getDescription());
}
session.commit();
session.close();
}
}
四，后记
more information about mybatis : http://mybatis.github.io/mybatis-3/index.html