6.修改默認查詢結果(query.list())不以Object[]數組形式返回,以Set形式返回,但是因為Set里是不允許有重複的元素,:username和password的值不能相同.只需將hql改為:String hql = " select new set(name,passwd) from Users";
7.修改默認查詢結果(query.list())不以Object[]數組形式返回,以自定義類型返回
自定義類:
Java代碼
package com.domain;
public class MyUser {
private String username;
private String password;
//因為:String hql = " select new com.domain.MyUser(name,passwd) from Users";必須要有接受2個參數的構造函數
public MyUser(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;
}
}
Java代碼
package com.domain;
public class MyUser {
private String username;
private String password;
//因為:String hql = " select new com.domain.MyUser(name,passwd) from Users";必須要有接受2個參數的構造函數
public MyUser(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;
}
}
Java代碼
package com.domain;
public class MyUser {
private String username;
private String password;
//因為:String hql = " select new com.domain.MyUser(name,passwd) from Users";必須要有接受2個參數的構造函數
public MyUser(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;
}
}
Java代碼
//通過query.list()出來的list里存放的不再是默認的Object數組了,而是自定義的類MyUser,必須加包名,String hql = "from Users";中的Users類也是必須加包名的,但是因為再Users.hbm.xml里<hibernate-mapping auto-import="true"> auto-import默認值為true(auto-import屬性也可以不寫),自動導入了
String hql = " select new com.domain.MyUser(name,passwd) from Users";
Query query = session.createQuery(hql);
//默認查詢出來的list里存放的是一個Object數組,但是在這裡list里存放的不再是默認的Object數組了,而是MyUser對象了
List<MyUser> myUsers = query.list();
for(MyUser myUser : myUsers){
String name = myUser.getUsername();
String passwd = myUser.getPassword();
System.out.println(name " : " passwd);
}
/**
輸出結果為:
name1 : password1
name2 : password2
name3 : password3
*/
Java代碼
//通過query.list()出來的list里存放的不再是默認的Object數組了,而是自定義的類MyUser,必須加包名,String hql = "from Users";中的Users類也是必須加包名的,但是因為再Users.hbm.xml里<hibernate-mapping auto-import="true"> auto-import默認值為true(auto-import屬性也可以不寫),自動導入了
String hql = " select new com.domain.MyUser(name,passwd) from Users";
Query query = session.createQuery(hql);
//默認查詢出來的list里存放的是一個Object數組,但是在這裡list里存放的不再是默認的Object數組了,而是MyUser對象了
List<MyUser> myUsers = query.list();
for(MyUser myUser : myUsers){
String name = myUser.getUsername();
String passwd = myUser.getPassword();
System.out.println(name " : " passwd);
}
/**
輸出結果為:
name1 : password1
name2 : password2
name3 : password3
*/
Java代碼
//通過query.list()出來的list里存放的不再是默認的Object數組了,而是自定義的類MyUser,必須加包名,String hql = "from Users";中的Users類也是必須加包名的,但是因為再Users.hbm.xml里<hibernate-mapping auto-import="true"> auto-import默認值為true(auto-import屬性也可以不寫),自動導入了
String hql = " select new com.domain.MyUser(name,passwd) from Users";
Query query = session.createQuery(hql);
//默認查詢出來的list里存放的是一個Object數組,但是在這裡list里存放的不再是默認的Object數組了,而是MyUser對象了
List<MyUser> myUsers = query.list();
for(MyUser myUser : myUsers){
String name = myUser.getUsername();
String passwd = myUser.getPassword();
System.out.println(name " : " passwd);
}
/**
輸出結果為:
name1 : password1
name2 : password2
name3 : password3
*/
8:條件查詢
Java代碼
//條件查詢,參數索引值從0開始,索引位置.通過setString,setParameter設置參數
String hql = "from Users where name=? and passwd=?";
Query query = session.createQuery(hql);
//第1種方式
// query.setString(0, "name1");
// query.setString(1, "password1");
//第2種方式
query.setParameter(0, "name1",Hibernate.STRING);
query.setParameter(1, "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
Java代碼
//條件查詢,參數索引值從0開始,索引位置.通過setString,setParameter設置參數
String hql = "from Users where name=? and passwd=?";
Query query = session.createQuery(hql);
//第1種方式
// query.setString(0, "name1");
// query.setString(1, "password1");
//第2種方式
query.setParameter(0, "name1",Hibernate.STRING);
query.setParameter(1, "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
Java代碼
//條件查詢,參數索引值從0開始,索引位置.通過setString,setParameter設置參數
String hql = "from Users where name=? and passwd=?";
Query query = session.createQuery(hql);
//第1種方式
// query.setString(0, "name1");
// query.setString(1, "password1");
//第2種方式
query.setParameter(0, "name1",Hibernate.STRING);
query.setParameter(1, "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
Java代碼
//條件查詢,自定義索引名(參數名):username,:password.通過setString,setParameter設置參數
String hql = "from Users where name=:username and passwd=:password";
Query query = session.createQuery(hql);
//第1種方式
// query.setString("username", "name1");
// query.setString("password", "password1");
//第2種方式,第3個參數確定類型
query.setParameter("username", "name1",Hibernate.STRING);
query.setParameter("password", "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
Java代碼
//條件查詢,自定義索引名(參數名):username,:password.通過setString,setParameter設置參數
String hql = "from Users where name=:username and passwd=:password";
Query query = session.createQuery(hql);
//第1種方式
// query.setString("username", "name1");
// query.setString("password", "password1");
//第2種方式,第3個參數確定類型
query.setParameter("username", "name1",Hibernate.STRING);
query.setParameter("password", "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
Java代碼
//條件查詢,自定義索引名(參數名):username,:password.通過setString,setParameter設置參數
String hql = "from Users where name=:username and passwd=:password";
Query query = session.createQuery(hql);
//第1種方式
// query.setString("username", "name1");
// query.setString("password", "password1");
//第2種方式,第3個參數確定類型
query.setParameter("username", "name1",Hibernate.STRING);
query.setParameter("password", "password1",Hibernate.STRING);
List<Users> list = query.list();
for(Users users : list){
System.out.println(users.getId());
}
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