JavaWeb_(Hibernate框架)Hibernate中数据查询语句HQL基本用法

HQL(Hibernate Query Language) 是面向对象的查询语言, 它和 SQL 查询语言有些相似. 在 Hibernate 提供的各种检索方式中, HQL 是使用最广的一种检索方式.，HQL 查询包括以下步骤:

　　1、获取Hibernate Session对象

　　2、编写HQL语句

　　3、以HQL语句作为参数，调用Session的createQuery方法创建查询对象。

　　4、如果HQL语句包含参数，则调用Query的setXxx方法为参数赋值。

　　5、调用Query对象的list()或uniqueResult()方法返回查询结果列表（持久化实体集）

　　本文展示三种基本的HQL查询用法

　　1.1、基本查询 Query query = session.createQuery(hql);

　　2、条件查询

　　　　2.1、基本条件查询 ： String hql = "from com.Gary.domain.User where id = 1";

　　　　2.2、?占位符：String hql = "from com.Gary.domain.User where id = ?0";

　　　　　　　　　　　　query.setParameter(0, id);

　　　　2.3、命名占位符 ：String hql = "from com.Gary.domain.User where id = :id ";

　　　　　　　　　　　　query.setParameter("id", id);

　　3.1、分页查询

　　　　　　　　limit ?, ?

　　　　　　　　String hql = "from com.Gary.domain.User";

　　　　　　　　query.setFirstResult(1);

　　　　　　　　query.setMaxResults(1);

package com.Gary.dao;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import com.Gary.domain.User;

import com.Gary.utils.HibernateUtils;

public class HQLDao {

    //1.基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.1基本条件查询

    public void search1()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = 1";

        Query query = session.createQuery(hql);

        User user = (User)query.uniqueResult();

        System.out.println(user.getName());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.2?占位符条件查询            id = 1

    public void search2(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = ?0";

        Query query = session.createQuery(hql);

        query.setParameter(0, id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.3命名占位符条件查询            id = 1

    public void search3(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = :id";

        Query query = session.createQuery(hql);

        query.setParameter("id", id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //3.1分页查询

    public void search4()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user limit 0,1;

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        //设置一条数据为一页   访问第二页的数据

        query.setFirstResult(1);

        query.setMaxResults(1);

        List<User> list = query.list();

        System.out.println(list.get(0).getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

}

HQLDao.java

　　数据库user表　　

　　向数据库中添加假数据

1.HQL基本查询语句

　　String hql = "from com.Gary.domain.User";

　　Query query = session.createQuery(hql);

　　HQLDao.java向数据库发起查询请求

//基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

User.java

package com.Gary.dao;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import com.Gary.domain.User;

import com.Gary.utils.HibernateUtils;

public class HQLDao {

    //基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

}

HQLDao.java

2.1基本条件查询

　　String hql = "from com.Gary.domain.User where id = 1";

　　Query query = session.createQuery(hql);

　　HQLDao.java向数据库发起查询请求

//基本条件查询

    public void search1()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = 1";

        Query query = session.createQuery(hql);

        User user = (User)query.uniqueResult();

        System.out.println(user.getName());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

User.java

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

HQLDao.java

2.1?占位符条件查询

　　String hql = "from com.Gary.domain.User where id = ?0";

　　Query query = session.createQuery(hql);

　　query.setParameter(0, id);

　　HQLDao.java向数据库发起查询请求

//2.2?占位符条件查询            id = 1

    public void search2(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = ?0";

        Query query = session.createQuery(hql);

        query.setParameter(0, id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

User.java

package com.Gary.dao;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import com.Gary.domain.User;

import com.Gary.utils.HibernateUtils;

public class HQLDao {

    //1.基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.1基本条件查询

    public void search1()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = 1";

        Query query = session.createQuery(hql);

        User user = (User)query.uniqueResult();

        System.out.println(user.getName());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.2?占位符条件查询            id = 1

    public void search2(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = ?0";

        Query query = session.createQuery(hql);

        query.setParameter(0, id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

}

UserDao.java

2.3命名占位符

　　String hql = "from com.Gary.domain.User where id = :id";

　　Query query = session.createQuery(hql);

　　query.setParameter("id", id);

　　HQLDao.java向数据库发起查询请求

//2.3命名占位符条件查询            id = 1

    public void search3(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = :id";

        Query query = session.createQuery(hql);

        query.setParameter("id", id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

User.java

package com.Gary.dao;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import com.Gary.domain.User;

import com.Gary.utils.HibernateUtils;

public class HQLDao {

    //1.基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.1基本条件查询

    public void search1()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = 1";

        Query query = session.createQuery(hql);

        User user = (User)query.uniqueResult();

        System.out.println(user.getName());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.2?占位符条件查询            id = 1

    public void search2(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = ?0";

        Query query = session.createQuery(hql);

        query.setParameter(0, id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.3命名占位符条件查询            id = 1

    public void search3(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = :id";

        Query query = session.createQuery(hql);

        query.setParameter("id", id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

}

HQLDao.java

3.1分页查询

        //操作 select * from user limit 0,1;

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

　　HQLDao.java向数据库发起查询请求

public void search4()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user limit 0,1;

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        //设置一条数据为一页   访问第二页的数据

        query.setFirstResult(1);

        query.setMaxResults(1);

        List<User> list = query.list();

        System.out.println(list.get(0).getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

package com.Gary.domain;

public class User {

    private String id;

    private String username;

    private String password;

    private String name;

    private String email;

    private String telephone;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    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;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

    }

    public String getTelephone() {

        return telephone;

    }

    public void setTelephone(String telephone) {

        this.telephone = telephone;

    }

}

User.java

package com.Gary.dao;

import java.util.List;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.query.Query;

import com.Gary.domain.User;

import com.Gary.utils.HibernateUtils;

public class HQLDao {

    //1.基本查询

    public void search()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        List<User> list = query.list();        //查询多条数据

        //query.uniqueResult();    查询唯一的数据

        System.out.println(list);

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.1基本条件查询

    public void search1()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = 1";

        Query query = session.createQuery(hql);

        User user = (User)query.uniqueResult();

        System.out.println(user.getName());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.2?占位符条件查询            id = 1

    public void search2(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = ?0";

        Query query = session.createQuery(hql);

        query.setParameter(0, id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //2.3命名占位符条件查询            id = 1

    public void search3(String id)

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user where id = 1;

        String hql = "from com.Gary.domain.User where id = :id";

        Query query = session.createQuery(hql);

        query.setParameter("id", id);

        User user = (User)query.uniqueResult();

        System.out.println(user.getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

    //3.1分页查询

    public void search4()

    {

        Session session = HibernateUtils.getSession();

        Transaction beginTransaction = session.beginTransaction();

        //模板：开始HQL操作

        //HQL完全面对类    from类的全包名

        //操作 select * from user limit 0,1;

        String hql = "from com.Gary.domain.User";

        Query query = session.createQuery(hql);

        //设置一条数据为一页   访问第二页的数据

        query.setFirstResult(1);

        query.setMaxResults(1);

        List<User> list = query.list();

        System.out.println(list.get(0).getUsername());

        //模板：完成操作

        beginTransaction.commit();

        session.close();

    }

}

HQLDao.java

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