Java DB 访问（三）mybatis mapper interface接口

1 项目说明

项目采用 maven 组织 ,依赖 mysql-connector-java，org.mybatis，junit pom 依赖如下：

mysql 数据连接 ：

mysql-connector-java

mybatis

mybatis

junit

junit 单元测试，本项目采用junit 跑单元测试，4.12 版本采用 @Test注解 测试方法，3.X 版本采用继承来实现测试方法

<dependencies>

<!-- https://mvnrepository.com/artifact/junit/junit -->

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.12</version>

<scope>test</scope>

</dependency>

<dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis</artifactId>

<version>3.4.5</version>

</dependency>

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.30</version>

</dependency>

</dependencies>

2 项目结构

3 DB 脚本

DROP TABLE IF EXISTS `account`;

CREATE TABLE `account` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`name` varchar(45) DEFAULT NULL,

`money` decimal(10,0) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=103 DEFAULT CHARSET=utf8;

-- ----------------------------

-- Records of account

-- ----------------------------

INSERT INTO `account` VALUES ('', 'hbb0b0', '');

INSERT INTO `account` VALUES ('', 'kael', '');

4 代码说明

MyDataSourceFactory

package hbb0b0.JavaBasic.mybatis03;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.datasource.DataSourceFactory;

import org.apache.ibatis.datasource.pooled.PooledDataSource;

public class MyDataSourceFactory implements DataSourceFactory {

private Properties prop;

public DataSource getDataSource() {

PooledDataSource ds = new PooledDataSource();

ds.setDriver(prop.getProperty("driver"));

ds.setUrl(prop.getProperty("url"));

ds.setUsername(prop.getProperty("user"));

ds.setPassword(prop.getProperty("password"));

return ds;

}

public void setProperties(Properties prprts) {

prop = prprts;

}

}

• model

package hbb0b0.JavaBasic.model;

import java.io.Serializable;

public class Account implements Serializable{

private int id;

private String name;

private double money;

public Account() {

super();

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getMoney() {

return money;

}

public void setMoney(double money) {

this.money = money;

}

@Override

public String toString() {

return "Account [id=" + id + ", name=" + name + ", money=" + money

+ "]";

}

}

• mapper interface

package hbb0b0.JavaBasic.mybatis03;

import org.apache.ibatis.annotations.Select;

public interface AccountMapper {

@Select("SELECT * FROM Account WHERE id = #{id}")

Account getAccountById(int id);

}

• session简单封装

package hbb0b0.JavaBasic.mybatis03;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.mapping.Environment;

import org.apache.ibatis.session.Configuration;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.apache.ibatis.transaction.TransactionFactory;

import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;

public class DbTool {

private static SqlSessionFactory m_sessionFactory;

private static void initSessionFactory()

{

Properties prop = new Properties();

prop.setProperty("driver", "com.mysql.jdbc.Driver");

prop.setProperty("url", "jdbc:mysql://localhost:3306/Study");

prop.setProperty("user", "root");

prop.setProperty("password", "sqlsa");

MyDataSourceFactory mdsf = new MyDataSourceFactory();

mdsf.setProperties(prop);

DataSource ds = mdsf.getDataSource();

TransactionFactory trFact = new JdbcTransactionFactory();

Environment environment = new Environment("development", trFact, ds);

Configuration config = new Configuration(environment);

config.addMapper(AccountMapper.class);

m_sessionFactory = new SqlSessionFactoryBuilder().build(config);

}

public static SqlSessionFactory GetSqlSessionFactory()

{

if(m_sessionFactory==null)

{

initSessionFactory();

}

return m_sessionFactory;

}

}

• JUNit

package hbb0b0.JavaBasic.mybatis03;

import static org.junit.Assert.assertNotNull;

import java.io.IOException;

import org.apache.ibatis.session.SqlSession;

import org.junit.Assert;

import org.junit.Test;

import java.lang.System;

/**

* Unit test for simple App.

*/

public class AppTest

{

@Test

public void getOne_Test() throws IOException {

SqlSession session = DbTool.GetSqlSessionFactory().openSession();

try {

AccountMapper mapper= session.getMapper(AccountMapper.class);

assertNotNull(mapper);

Account account = mapper.getAccountById(1);

assertNotNull(account);

Assert.assertEquals("hbb0b0",account.getName());

System.out.println(account.toString());

} finally {

session.close();

}

}

}

测试结果：