一、spring Jdbc Template的常用方法execute()
1、导入相关的jar包
2、在src目录下创建applicationContext.xml文件，在该文件中配置数据源和配置jdbc模板
3、进行测试，在com.itheima.jdbc包下，创建测试类JdbcTemplateTest.java
package com.itheima.jdbc;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
public class JdbcTemplateTest {
public static void main(String[] args){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
JdbcTemplate jdbctemplate=(JdbcTemplate)app2.getBean("jdbcTemplate");
String sql= "create table account("+"id int primary key auto_increment,"+"username varchar(50),"+"balance double)";
jdbctemplate.execute(sql);
System.out.print("账户表account创建成功");
}
}
二、spring Jdbc Template的常用方法update()
update()方法可以进行插入、更新和删除数据的操作。
1、导入相关的jar包，同上
2、com.itheima.jdbc创建Account.java的实体类
package com.itheima.jdbc;
public class Account {
private Integer id;//账户id
private String username;//账户姓名
private Double balance;//账户余额
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Double getBalance() {
return balance;
}
public void setBalance(Double balance) {
this.balance = balance;
}
@Override
public String toString() {
return "Account [id=" + id + ", username=" + username + ", balance="
+ balance + "]";
}
}
3、com.itheima.jdbc包下创建接口类AccountDao.java和其实现类AccountDaoImpl.java
package com.itheima.jdbc;
public interface AccountDao {
public int addAcount(Account account);
public int updateAccount(Account account);
public int deleteAccount(int id);
}
package com.itheima.jdbc;
import org.springframework.jdbc.core.JdbcTemplate;
public class AccountDaoImpl implements AccountDao {
private JdbcTemplate jdbcTempalet;
public void setJdbcTempalet(JdbcTemplate jdbcTempalet) {
this.jdbcTempalet = jdbcTempalet;
}
@Override
public int addAcount(Account account) {
// TODO Auto-generated method stub
String sql="insert into account(username,balance) value(?,?)";
Object[] obj=new Object[]{account.getUsername(),account.getBalance()};
//执行添加操作，返回的是受sql语句影响的记录条数
int num=this.jdbcTempalet.update(sql,obj);
return num;
}
@Override
public int updateAccount(Account account) {
// TODO Auto-generated method stub
String sql="update account set username=?,balance=? where id=?";
Object[] obj=new Object[]{account.getUsername(),account.getBalance(),account.getId()};
int num=this.jdbcTempalet.update(sql,obj);
return num;
}
@Override
public int deleteAccount(int id) {
// TODO Auto-generated method stub
String sql= "delete from account where id=?";
int num=this.jdbcTempalet.update(sql,id);
return num;
}
}
4、在src目录下创建applicationContext.xml文件
5、在com.itheima.jdbc中创建测试类JdbcTemplateTest.java
package com.itheima.jdbc;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
public class JdbcTemplateTest {
@Test
public void addAccountTest(){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
AccountDao accountdao=(AccountDao)app2.getBean("accountDao");
Account account=new Account();
account.setUsername("tom");
account.setBalance(2000.00);
//执行addAccount()方法，获取返回结果
int num=accountdao.addAcount(account);
if(num>0)
{
System.out.print("成功插入"+num+"条数据！");
}else{
System.out.print("插入操作执行失败");
}
}
@Test
public void updateAccountTest(){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
AccountDao accountdao=(AccountDao)app2.getBean("accountDao");
Account account=new Account();
account.setId(1);
account.setUsername("tom");
account.setBalance(2000.00);
//执行addAccount()方法，获取返回结果
int num=accountdao.updateAccount(account);
if(num>0)
{
System.out.print("成功修改了"+num+"条数据！");
}else{
System.out.print("修改操作执行失败");
}
}
@Test
public void deleteAccountTest(){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
AccountDao accountdao=(AccountDao)app2.getBean("accountDao");
//执行addAccount()方法，获取返回结果
int num=accountdao.deleteAccount(1);
if(num>0)
{
System.out.print("成功删除"+num+"条数据！");
}else{
System.out.print("删除操作执行失败");
}
}
}
三、spring Jdbc Template的常用方法query()
1、在上面的情况下在AccountDao.java里面创建一个通过id查询单个账户和查询所有账户的方法，并在实现类中实现其相应的方法，具体如下：
public Account findAccountById(int id);
public List findAll();
@Override
public Account findAccountById(int id) {
// TODO Auto-generated method stub
String sql ="select * from account where id=?";
//创建一个BeanPropertyRowMapper对象，
RowMapper rowmapper=new BeanPropertyRowMapper(Account.class);
//将id捆绑到sql语句中，并且通过RowMapper返回一个Object类型的单行数据
return this.jdbcTempalet.queryForObject(sql, rowmapper, id);//这里会将Object类型的数据转化为Account对象的类型数据
}
@Override
public List findAll() {
// TODO Auto-generated method stub
String sql ="select * from account";
RowMapper rowmapper=new BeanPropertyRowMapper(Account.class);
return this.jdbcTempalet.query(sql, rowmapper);//这里会将Object类型的数据转化为Account对象的类型数据
}
2、在上面的测试类中加上测试方法
@Test
public void findAccountTest(){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
AccountDao accountdao=(AccountDao)app2.getBean("accountDao");
//执行addAccount()方法，获取返回结果
Account account=accountdao.findAccountById(2);
System.out.print(account);
}
@Test
public void findAllAccountTest(){
//加载配置文件
ApplicationContext app2=new ClassPathXmlApplicationContext("applicationContext.xml");
//获取JdbcTemplate实例
AccountDao accountdao=(AccountDao)app2.getBean("accountDao");
//执行addAccount()方法，获取返回结果
List account=accountdao.findAll();
for(Account act:account){
System.out.print("名字："+act.getUsername()+","+"金额"+act.getBalance()+"\n");
}
}