发表于： 2020-05-09 21:16:49
1 1309
今日完成的事情：整合spring与mybatis
POM文件
?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>Try</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<spring.version>4.3.18.RELEASE</spring.version>
<!-- <spring.version>5.2.5.RELEASE</spring.version>-->
</properties>
<dependencies>
<!-- 链接mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!--mybatis框架-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
</dependency>
<!-- mybatis整合spring-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- 日志包 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- druid链接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.20</version>
</dependency>
<!--spring上下文-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<!-- -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
</project>
实现类代码：
package user;
public class User {
private int id;
private String name;
private int qq;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getQq() {
return qq;
}
public void setQq(int qq) {
this.qq = qq;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", qq=" + qq +
'}';
}
}
实现类接口
package imp;
import user.User;
public interface IUser {
User getUserById(int id);
}
接口映射配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="imp.IUser">
<select id="getUserById" parameterType="int" resultType="user.User">
SELECT * from account where id = #{id}
</select>
</mapper>
properties文件：
db.driver = com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/qqqq?characterEncoding=UTF-8
db.username=root
db.password=123456
applicationContext文件（在这个配置文件中整合了mybatis）
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--开启扫描-->
<context:component-scan base-package="imp"/>
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:properties/*.properties"/>
<!--连接数据库-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${db.driver}"/>
<property name="url" value="${db.url}"/>
<property name="username" value="${db.username}"/>
<property name="password" value="${db.password}"/>
</bean>
<!-- 配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--数据源-->
<property name="dataSource" ref="dataSource"/>
<!--找到mybatis文件-->
<property name="mapperLocations" value="classpath:imp/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 配置SqlSessionFactoryBean的名称 -->
<property name="basePackage" value="imp"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
</beans>
测试类代码
import imp.IUser;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import user.User;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TryTest{
@Autowired
IUser iUser;
@Test
public void getUserById(){
User user = iUser.getUserById(2);
System.out.println(user);
}
}
结果如下
目录
运行的时候出现了两个报错
2020-05-09 17:51:40 [ Druid-ConnectionPool-Create-1213818572:2911 ] - [ ERROR ] create connection SQLException, url: jdbc:mysql//localhost:3306/qqqq?characterEncoding=UTF-8, errorCode 0, state null
java.sql.SQLException: connect error, url jdbc:mysql//localhost:3306/qqqq?characterEncoding=UTF-8, driverClass com.mysql.jdbc.Driver
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1713)
at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2715)
create connection SQLException, url: jdbc:mysql//localhost:3306/qqqq?characterEncoding=UTF-8, errorCode 0, state null
java.sql.SQLException: connect error, url jdbc:mysql//localhost:3306/qqqq?characterEncoding=UTF-8, driverClass com.mysql.jdbc.Driver
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1713)
at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2715)
发现是sql语句错误了，select*from 表名 我把表名打成了库名
还有就是 jdbc:mysql://localhost:3306/库名 这个语句总少打冒号...多打它几遍
然后在孙师兄的帮助下，购买了一台腾讯云服务器
明天计划的事情：编写任务一的代码，尝试跑服务器
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