使用hibernate生成表结构

准备工作

首先创建一个空的web项目，在其中添加hibernate的jar包
在src目录下创建hibernate配置文件：hibernate.cfg.xml
(如果使用intellij idea创建maven项目，src默认不是Source Folders,可以在file->project Structure->modules下右键src选sources然后apply即可)

<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-configuration PUBLIC        "-//Hibernate/Hibernate Configuration DTD//EN"        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory>        <property name="connection.url">jdbc:mysql://localhost:3306/test</property>        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="connection.username">root</property>        <property name="connection.password">root</property>        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>        <!--show_sql 用来在控制台输出控制语句-->        <property name="show_sql">true</property>        <!--format_sql 用来格式化输出的语句-->        <property name="format_sql">true</property>        <property name="hbm2ddl.auto">update</property>        <property name="hibernate.current_session_context_class">thread</property>    </session-factory></hibernate-configuration>

创建实体类

在src文件夹下创建entity包，并在entity下创建Users.java和Students.java两个类
Users.java

package entity;/** * Created by mycomputer on 2017/5/29. */public class Users {    private int uid;    private String username;    private String password;    public Users() {    }    public int getUid() {        return uid;    }    public void setUid(int uid) {        this.uid = uid;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    @Override    public String toString() {        return "Users{" +                "uid=" + uid +                ", username='" + username + '\'' +                ", password='" + password + '\'' +                '}';    }}

Students.java

package entity;import java.util.Date;/** * Created by mycomputer on 2017/5/29. */public class Students {    private String sid;    private String sname;    private String gender;    private Date birthday;    private String address;    public Students() {    }    public String getSid() {        return sid;    }    public void setSid(String sid) {        this.sid = sid;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public String getGender() {        return gender;    }    public void setGender(String gender) {        this.gender = gender;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }    @Override    public String toString() {        return "Students{" +                "sid='" + sid + '\'' +                ", sname='" + sname + '\'' +                ", gender='" + gender + '\'' +                ", birthday=" + birthday +                ", address='" + address + '\'' +                '}';    }}

然后创建两个类对应的配置文件
Users.hbm.xml

<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-mapping PUBLIC    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="entity.Users" >        <id name="uid"  type="int">            <generator class="native"/>        </id>        <property name="username" type="java.lang.String"/>        <property name="password" type="java.lang.String"/>    </class></hibernate-mapping>

Strudents.hbm.xml

<?xml version='1.0' encoding='utf-8'?><!DOCTYPE hibernate-mapping PUBLIC    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="entity.Students" >        <id name="sid" type="java.lang.String" length="8">            <generator class="assigned"/>        </id>        <property name="sname" type="java.lang.String"/>        <property name="gender" type="java.lang.String"/>        <property name="birthday" type="date"/>        <property name="address" type="java.lang.String"/>    </class></hibernate-mapping>

将Users.hbm.xml和Students.hbm.xml两个配置文件添加到主配置文件hibernate.cfg.xml中
在hibernate.cfg.xml的session-Factory标签中添加如下两行代码：

        <mapping resource="entity/Students.hbm.xml"/>        <mapping resource="entity/Users.hbm.xml"/>

生成表结构

创建一个单元测试类TestStudents.java
在单元测试类中添加测试方法public void testSchemaExport(){}
在测试类中使用SchemaExport创建表结构
完整代码如下：

package entity;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;import org.hibernate.tool.hbm2ddl.SchemaExport;import org.junit.Test;/** * Created by mycomputer on 2017/5/29. */public class TestStudents {    @Test    public void testSchemaExport(){        //创建配置对象        Configuration config = new Configuration().configure();        //创建服务注册对象        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();        //创建sessionFactory        SessionFactory sessionFactory = config.buildSessionFactory(serviceRegistry);        //第一个TRUE表示生成表结构        //第二个TRUE表示输出sql语句        export.create(true,true);    }}

运行单元测试

在运行单元测试之前要先创建test数据库。然后运行测试单元即可；