Hibernate 入门

 <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-core</artifactId>
      <version>5.4.2.Final</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>6.0.15.Final</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>5.4.2.Final</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-annotations -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-annotations</artifactId>
      <version>3.5.6-Final</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0 -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-c3p0</artifactId>
      <version>5.4.3.Final</version>
    </dependency>
    <dependency>
      <groupId>org.hibernate.javax.persistence</groupId>
      <artifactId>hibernate-jpa-2.0-api</artifactId>
      <version>1.0.0.Final</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.6.1</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.15</version>
    </dependency>


  </dependencies>

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory >
        <!-- 1、配置数据库连接的4个参数 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hibernate_day1?serverTimezone=GMT%2B8</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>

        <!--  是否显示sql语句 -->
        <property name="show_sql">true</property>
        <!--  是否格式化sql语句 -->
        <property name="format_sql">true</property>
        <!--  是否自动提交事务 -->
        <property name="hibernate.connection.autocommit">true</property>

        <!-- 2、配置JavaBean与表的映射文件 -->
        <!--<mapping resource= "cn/edu/aynu/User.hbm.xml"/>-->
        <mapping resource="User.hbm.xml"></mapping>
        <!--<mapping class="cn/edu/aynu/User.hbm.xml"></mapping>-->
        <!--<mapping package="cn/edu/aynu/User.hbm.xml"></mapping>-->

    </session-factory>
</hibernate-configuration>

<!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="cn.edu.aynu.User" table="t_user">
        <!-- 1、主键，如果属性与表字段不一至，要指定column -->

        <id name="uid" column="id">
            <!-- 主键生成策略  -->
            <generator class="native"></generator>
        </id>
        <!-- 2、用户字段 -->
        <property name="username"></property>
        <property name="password"></property>
    </class>
</hibernate-mapping>

public class User {

    public int getUid() {
        return uid;
    }

    public void setUid(int uid) {
        this.uid = uid;
    }

    private int uid;
    private String username;
    private String password;

    public User() {
    }

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    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 "User{" +
                "username=‘" + username + ‘\‘‘ +
                ", password=" + password +
                ‘}‘;
    }
}