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Intellij Mybatis连接Mysql数据库

2019年07月22日  | 移动技术网IT编程  | 我要评论

有好一段时间没有学习新东西了，过了个十月一感觉事情还是越早做越好，废话不多说了，说一下用mybatis连接mysql数据库，上一篇写了jdbc测试，我的数据库表还是原来的。由于从网上查的资料大部分都是eclipse，由于我是做android开发的，习惯了ide，所以就硬着头皮来了，中间其实遇到过好多问题。

看一下工程结构

这里写图片描述

先说一下java代码，dao是查询接口，model是ben和对应的查询语句的xml，我感觉这样有点不好，user.xml放在dao里面比较好，等理解了就知道了，由于我是初学者所以好多东西都不是很理解，后期会给出合理的包的定义

test是我做测试用的

再说一下resources，configuration是配置文件，log4j是日志打印，其他的暂时用不到。

好来看一下代码，我按照建文件的顺序给大家来，
首先需要有一个对象，对象根据数据库建

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 指定单条记录返回的类型-->
<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,有可能会引起sql注入的情况-->
<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,"陈潇然","女","大学同学")-->
<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", "%李宁%");
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("李宁");
user.setsex("女");
user.setaddress("家里蹲");
int isadd = sqlsession.insert("com.fanyafeng.dao.iuserdao.add", user);
sqlsession.commit();//不要忘记
} 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中进行配置了,此处可以省略配置-->
<!--<typealiases>-->
<!--<typealias alias="user" type="com.fanyafeng.model.user"/>-->
<!--</typealiases>-->
<!-- 和spring整合后 environments配置将废除-->
<environments default="development">
<environment id="development">
<!-- 使用jdbc事务管理-->
<transactionmanager type="jdbc"/>
<!-- 数据库连接池-->
<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的话大家根据自己的爱好添加就好了，代码中注释写的很详细了，我就不细讲了，这里有个地方让我很憋屈，问了个大神才知道咋回事，截图中有target目录吧，这是编译好文件的存放位置，可是，问题来了，java文件给我编译好放在哪里了，可是非resource得xml文件没有给我放进去，丢出来了一个异常，查了好多资料答非所问，然后是这样解决的
看一下pom.xml文件，我更改后的，加了build标签中了

<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>

这就可以了，我这里实现了查，增，别的正在学习中。

以上所述是小编给大家介绍的intellij mybatis连接mysql数据库，希望对大家有所帮助

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