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Intellij Mybatis連接Mysql數(shù)據(jù)庫

更新時間：2016年10月12日 10:26:43 作者：樊亞風(fēng)

最近在搞android的項目，在開發(fā)過程中遇到了好多問題，今天小編給大家說下mybatis連接MySQL數(shù)據(jù)庫的方法，感興趣的朋友跟著小編一起學(xué)習(xí)吧

有好一段時間沒有學(xué)習(xí)新東西了，過了個十月一感覺事情還是越早做越好，廢話不多說了，說一下用mybatis連接MySQL數(shù)據(jù)庫，上一篇寫了jdbc測試，我的數(shù)據(jù)庫表還是原來的。由于從網(wǎng)上查的資料大部分都是eclipse，由于我是做Android開發(fā)的，習(xí)慣了ide，所以就硬著頭皮來了，中間其實遇到過好多問題。

看一下工程結(jié)構(gòu)

這里寫圖片描述

先說一下Java代碼，dao是查詢接口，model是ben和對應(yīng)的查詢語句的xml，我感覺這樣有點不好，user.xml放在dao里面比較好，等理解了就知道了，由于我是初學(xué)者所以好多東西都不是很理解，后期會給出合理的包的定義

test是我做測試用的

再說一下resources，configuration是配置文件，log4j是日志打印，其他的暫時用不到。

好來看一下代碼，我按照建文件的順序給大家來，
首先需要有一個對象，對象根據(jù)數(shù)據(jù)庫建

user.java

package com.fanyafeng.model;

import java.util.Date;
/**
* Author： fanyafeng
* Data： 16/10/11 14:56
* Email: fanyafeng@live.cn
*/
public class User {
private int id;
private String username;
private Date birthday;
private String sex;
private String address;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}

iuserdao.java

package com.fanyafeng.dao;
import com.fanyafeng.model.User;
import java.util.List;
/**
* Author： fanyafeng
* Data： 16/10/11 14:55
* Email: fanyafeng@live.cn
*/
public interface IUserDao {
public List<User> queryUserByName(String name);
public User selectUserById(int id);
public void add();
public void del(int id);
public void alter(int id);
}

user.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">
<!--resultType 指定單條記錄返回的類型-->
<mapper namespace="com.fanyafeng.dao.IUserDao">
<select id="selectUserById" parameterType="int" resultType="com.fanyafeng.model.User">
select * from user where id = #{id}
</select>
<!--'%${value}' 表示拼接sql串,只能使用value,有可能會引起sql注入的情況-->
<select id="queryUserByName" parameterType="String" resultType="com.fanyafeng.model.User">
SELECT * FROM user WHERE username LIKE #{name}
</select>
<!--INSERT INTO USER (id,username,sex,address) VALUE (null,"陳瀟然","女","大學(xué)同學(xué)")-->
<insert id="add" parameterType="com.fanyafeng.model.User">
insert into user (id,username,birthday,sex,address) values (#{id},#{username},#{birthday},#{sex},#{address})
</insert>
</mapper>

usertest.java

package com.fanyafeng.test;
import com.fanyafeng.model.User;
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 java.io.IOException;
import java.io.Reader;
import java.util.Date;
import java.util.List;
/**
* Author： fanyafeng
* Data： 16/10/11 14:58
* Email: fanyafeng@live.cn
*/
public class UserTest {
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;
static {
try {
reader = Resources.getResourceAsReader("Configuration.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
// User user = (User) sqlSession.selectOne("com.fanyafeng.dao.IUserDao.selectUserById", 2);
// System.out.println(user.getAddress() + user.getSex() + user.getBirthday());
// System.out.println(user.getId() + user.getUsername());
//
//
List<User> userList = sqlSession.selectList("com.fanyafeng.dao.IUserDao.queryUserByName", "%李寧%");
for (int i = 0; i < userList.size(); i++) {
System.out.println(userList.get(i).toString());
}
User user = new User();
user.setId(100);
user.setBirthday(new Date());
user.setUsername("李寧");
user.setSex("女");
user.setAddress("家里蹲");
int isAdd = sqlSession.insert("com.fanyafeng.dao.IUserDao.add", user);
sqlSession.commit();//不要忘記
} finally {
sqlSession.close();
}
}
}

configration.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>
<!--如果在mapper中進行配置了,此處可以省略配置-->
<!--<typeAliases>-->
<!--<typeAlias alias="User" type="com.fanyafeng.model.User"/>-->
<!--</typeAliases>-->
<!-- 和spring整合后 environments配置將廢除-->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事務(wù)管理-->
<transactionManager type="JDBC"/>
<!-- 數(shù)據(jù)庫連接池-->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value=""/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/fanyafeng/model/User.xml"/>
</mappers>
</configuration>

log4j的話大家根據(jù)自己的愛好添加就好了，代碼中注釋寫的很詳細(xì)了，我就不細(xì)講了，這里有個地方讓我很憋屈，問了個大神才知道咋回事，截圖中有target目錄吧，這是編譯好文件的存放位置，可是，問題來了，java文件給我編譯好放在哪里了，可是非resource得xml文件沒有給我放進去，丟出來了一個異常，查了好多資料答非所問，然后是這樣解決的
看一下pom.xml文件，我更改后的，加了build標(biāo)簽中了

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.fanyafeng</groupId>
<artifactId>mybatisdemo</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>mybatisdemo Maven Webapp</name>
<url>http://maven.apache.org</url>
<build>
<finalName>mybatisdemo</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.21</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.javassist/javassist -->
<dependency>
<groupId>org.javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.18.1-GA</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/cglib/cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/asm/asm -->
<dependency>
<groupId>asm</groupId>
<artifactId>asm</artifactId>
<version>3.3.1</version>
</dependency>
</dependencies>
</project>

這就可以了，我這里實現(xiàn)了查，增，別的正在學(xué)習(xí)中。

以上所述是小編給大家介紹的Intellij Mybatis連接Mysql數(shù)據(jù)庫，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持！

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