基于mybatis的留言本
时间: 2023-10-23 19:13:03 浏览: 79
首先,需要在pom.xml中引入mybatis的依赖:
```xml
<!-- MyBatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.6</version>
</dependency>
```
接着,在mybatis的配置文件中配置数据源和mapper:
```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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="mapper/MessageMapper.xml"/>
</mappers>
</configuration>
```
其中,MessageMapper.xml是我们自己定义的mapper文件,用于定义留言本的增删改查操作。
接着,我们定义Message实体类:
```java
public class Message {
private Long id;
private String name;
private String content;
private Date createTime;
// getter和setter方法
}
```
接着,我们定义MessageMapper接口,用于定义留言本的增删改查操作:
```java
public interface MessageMapper {
void addMessage(Message message);
void deleteMessage(Long id);
void updateMessage(Message message);
Message getMessage(Long id);
List<Message> listMessages();
}
```
最后,我们实现留言本的增删改查操作:
```java
public class MessageService {
private SqlSessionFactory sqlSessionFactory;
public MessageService(SqlSessionFactory sqlSessionFactory) {
this.sqlSessionFactory = sqlSessionFactory;
}
public void addMessage(Message message) {
try (SqlSession sqlSession = sqlSessionFactory.openSession(true)) {
MessageMapper messageMapper = sqlSession.getMapper(MessageMapper.class);
messageMapper.addMessage(message);
}
}
public void deleteMessage(Long id) {
try (SqlSession sqlSession = sqlSessionFactory.openSession(true)) {
MessageMapper messageMapper = sqlSession.getMapper(MessageMapper.class);
messageMapper.deleteMessage(id);
}
}
public void updateMessage(Message message) {
try (SqlSession sqlSession = sqlSessionFactory.openSession(true)) {
MessageMapper messageMapper = sqlSession.getMapper(MessageMapper.class);
messageMapper.updateMessage(message);
}
}
public Message getMessage(Long id) {
try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
MessageMapper messageMapper = sqlSession.getMapper(MessageMapper.class);
return messageMapper.getMessage(id);
}
}
public List<Message> listMessages() {
try (SqlSession sqlSession = sqlSessionFactory.openSession()) {
MessageMapper messageMapper = sqlSession.getMapper(MessageMapper.class);
return messageMapper.listMessages();
}
}
}
```
这样,我们就实现了一个基于mybatis的留言本。需要注意的是,这里只是一个简单的示例,实际开发中需要考虑更多的细节和安全性问题。