ibatis integrated mycat service
1. First get ibatis
1) Define the database configuration file
<?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>
<!-- Specify the location of the database connection information-->
<properties resource="db.properties"></properties>
<!-- mybatis alias definition -->
<typeAliases>
<typeAlias alias="User" type="com.mybatis.test.User"/>
</typeAliases>
<!-- The space name of the registered object -->
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<!-- 1. Load database driver-->
<property name="driver" value="${db1.driver}" />
<!-- 2. Database connection address: -->
<property name="url" value="${db1.url}" />
<!-- Database user... -->
<property name="username" value="${db1.username}" />
<!-- database password... -->
<property name="password" value="${db1.password}" />
</dataSource>
</environment>
</environments>
<!-- Registration mapping file: xml file path between java object and database! -->
<mappers>
<mapper resource="User.xml"/>
</mappers>
</configuration>
2) Define the SQL file
<?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="com.mybatis.test">
<!-- select语句 -->
<select id="selectUserByID" parameterType="int" resultType="User">
select * from `t_user` where id = #{id}
</select>
<select id="selectAllUsers" resultType="User">
select * from t_user
</select>
<insert id="addUser" parameterType="User" >
insert into t_user(id,userName) values(#{id},#{userName})
</insert>
<update id="updateUser" parameterType="User" >
update t_user set userName=#{userName} where id=#{id}
</update>
<delete id="deleteUser" parameterType="int">
delete from t_user where id=#{id}
</delete>
</mapper>
3）集成关键db.properties,可以配置多数据源
db1.driver = com.mysql.jdbc.Driver
db1.url =jdbc:mysql://localhost:8066/TESTDB
db1.username =root
db1.password =root
db2.driver = oracle.jdbc.driver.OracleDriver
db2.url =jdbc:oracle:thin:@localhost:1521:TESTDB
db2.username =root
db2.password =root
db3.driver = com.mysql.jdbc.Driver
db3.url =jdbc:mysql://localhost:8066/db3
db3.username =root
db3.password =root
4）测试代码
package cn.com.test;
import java.io.Reader;
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 com.mybatis.test.User;
public class SqlSessionUtil {
private static final String NS = "com.mybatis.test.";
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;
static {
try {
reader = Resources.getResourceAsReader("ibatis_config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSession() {
return sqlSessionFactory;
}
public User getUserByID(int userID) {
SqlSession session = sqlSessionFactory.openSession();
try {
User user = session.selectOne(NS + "selectUserByID", userID);
if (user != null) {
System.out.println(user.getId() + ":" + user.getUserName());
}
return user;
} finally {
session.close();
}
}
public void addUser(User user) {
SqlSession session = sqlSessionFactory.openSession();
try {
int cc = session.insert(NS + "addUser", user);
System.out.println("add" +cc + " OK ");
} finally {
session.close();
}
}
public void delete(int id ) {
SqlSession session = sqlSessionFactory.openSession();
try {
int cc = session.delete(NS + "deleteUser", id);
System.out.println("delete" +cc + " OK ");
} finally {
session.close();
}
}
public void update(User user) {
SqlSession session = sqlSessionFactory.openSession();
try {
int cc = session.update(NS + "updateUser", user);
System.out.println("update" +cc + " OK ");
} finally {
session.close();
}
}
public void getUserList() {
SqlSession session = sqlSessionFactory.openSession();
try {
List<User> users = session.selectList(NS + "selectAllUsers");
for (User user : users) {
System.out.println(user.getId() + ":" + user.getUserName());
}
} finally {
session.close();
}
}
public static void main(String[] args) {
SqlSessionUtil su = new SqlSessionUtil();
System.out.println(su.getSession());
//User user = new User(10,"张仨疯");
//su.addUser(user);
//
//user = new User(2,"gaojingsong");
//su.addUser(user);
User user = su.getUserByID(10);
System.out.println("--------getUserList---------");
su.getUserList();
user.setUserName("test_mycat");
su.update(user);
su.delete(1);
}
}
附件：
附件解压密码：525354786
建表语句：
CREATE TABLE `t_user` (
`id` int NULL ,
`userName` varchar(100) NULL ,
PRIMARY KEY (`id`)
)
;
select * from t_user
错误解析
1）schema没有定义表
2）schema定义表，数据库中没有建立表，报片键不存在
3）新建表，发现mycat新的bug
二、验证结果
1）增加
2）查询单个和列表
3）修改删除
4）修改删除验证
