通过hibernate访问postgreSQL的搭建过程

1. 　　hibernate jar包 在pom.xml写依赖:

   <!--hibernate--> <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core --> <dependency>   <groupId>org.hibernate</groupId>   <artifactId>hibernate-core</artifactId>   <version>5.1.2.Final</version> </dependency>

2. postgreSQL jdbc jar包引入   在pom.xml中写依赖:

   <dependency>   <groupId>postgresql</groupId>   <artifactId>postgresql</artifactId>   <version>9.1-901-1.jdbc4</version> </dependency>

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "src/resource/schema/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>
        <!-- Database connection settings -->
        <!-- Database connection settings -->
        <property name="connection.driver_class">
            org.postgresql.Driver
        </property>
        <property name="connection.url">
            jdbc:postgresql://10.21.132.19:5432/test
        </property>
        <property name="connection.username">postgres</property>
        <property name="connection.password">88075998</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">
            org.hibernate.dialect.PostgreSQLDialect
        </property>

        <!-- Enable Hibernate‘s automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache
        <property name="cache.provider_class">
            org.hibernate.cache.internal.NoCacheProvider
        </property>-->

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">false</property>

        <!-- Drop and re-create the database schema on startup -->
        <!-- <property name="hbm2ddl.auto">update</property> -->

        <!-- <mapping resource="com/hik/gss/sys/domain/User.hbm.xml" />-->

        <mapping class="model.User"></mapping>
    </session-factory>

</hibernate-configuration>

package model;

import org.hibernate.annotations.GenericGenerator;

import javax.persistence.*;

@Entity
@Table(name="public.user")
public class User {
    private Integer userId;
    private String userName;
    private String passWord;

    @Id
    @GeneratedValue(generator="increment")
    @GenericGenerator(name="increment", strategy = "increment")
    @Column(name = "user_id")
    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    @Column(name = "username")
    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    @Column(name = "password")
    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

}

注解说明:@Entity实体类标注,    @Table标注表名,注意表名前面要写模式名(public),被坑过.   @Id 表示主键   @Column列名

        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
                .configure()                 .build();
         SessionFactory sessionFactory = null;
        try {
            sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
        } catch (Exception e) {
            // The registry would be destroyed by the SessionFactory, but we had trouble building the SessionFactory
            // so destroy it manually.
            StandardServiceRegistryBuilder.destroy( registry );
        }

        Session session = sessionFactory.openSession();
        session.beginTransaction();
        List result = session.createQuery( "from model.User" ).list();
        for ( User user : (List<User>) result ) {
            System.out.println( "User (" + user.getUserName() + ") : " + user.getPassWord() );
            if (this.passWord.equals(user.getPassWord()) && this.userName.equals(user.getUserName())) {
                return "SUCCESS";
            }
        }
        session.getTransaction().commit();
        session.close();

总结一下查询的步骤:

1. 注册
2. 创建会话工厂
3. 会话工厂生产会话
4. 创建查询语句
5. 会话执行查询语句
6. 获取结果