Hibernate入门（2）- 不用配置用注解
2024-10-14 08:13:58
在上一个例子里面，我用的配置文件的方式，这次改成注解。
pom.xml
增加了hibernate-commons-annotations和hibernate-annotations
<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>com.wisdombud</groupId>
<artifactId>HibernateTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>HibernateTest</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<hibernate.version>4.2.0.Final</hibernate.version>
<hibernate.search>4.2.0.Final</hibernate.search>
<mysql-connector-java.version>5.1.29</mysql-connector-java.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql-connector-java.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-search</artifactId>
<version>${hibernate.search}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>3.2.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.2.0.ga</version>
</dependency>
</dependencies>
</project>
hibernate.cfg.xml配置文件
把mapping resource改成mapping class
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/tz?useUnicode=true&characterEncoding=utf8
</property>
<property name="connection.username">tz</property>
<property name="connection.password">tz</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="show_sql">true</property>
<mapping class="com.wisdombud.HibernateTest.Dept" />
</session-factory>
</hibernate-configuration>
对象的修改
这个是重点，需要在类和属性上面增加注解。可以在属性上增加注解或者在get方法上增加注解。
package com.wisdombud.HibernateTest;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "dept")
public class Dept {
private String id;
private String DeptNo;
private String DName;
@Column(name = "id")
@Id
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Column(name = "DeptNo")
public String getDeptNo() {
return DeptNo;
}
public void setDeptNo(String deptNo) {
DeptNo = deptNo;
}
@Column(name = "DName")
public String getDName() {
return DName;
}
public void setDName(String dName) {
DName = dName;
}
}
删除hbm配置文件
把Dept.hbm.xml删除就可以了。
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