1 db.properties
jdbc.user=root
jdbc.password=920614
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///spring?useUnicode=true&characterEncoding=utf-8 jdbc.initPoolSize=5
jdbc.maxPoolSize=10
2 applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:c="http://www.springframework.org/schema/c"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <context:component-scan base-package="com.spring.jdbc"></context:component-scan>
<!-- 导入资源文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置C3P0数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <!-- 配置Spring的JdbcTemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean> <!-- 配置 NamedParameterJdbcTemplate,
该对象可以使用具名参数, 其没有无参数的构造器, 所以必须为其构造器指定参数 -->
<bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
<constructor-arg ref="dataSource"></constructor-arg>
</bean> <!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean> <!-- 启用事务注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/> </beans>
3 com.spring.jdbc
实体类
package com.spring.jdbc;
public class Employee {
private int id;
private String lastName;
private String email;
private int deptId;
public int getDeptId() {
return deptId;
}
public void setDeptId(int deptId) {
this.deptId = deptId;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Employee [id=" + id + ", lastName=" + lastName + ", email="
+ email + ", deptId=" + deptId + "]";
}
}
EmployeeDao.java
package com.spring.jdbc; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository; @Repository
public class EmployeeDao { @Autowired
private JdbcTemplate jdbcTemplate; public Employee get(int id){
String sql="SELECT id,last_name lastName,email,dept_id FROM employees WHERE id=?";
RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);
Employee employee=jdbcTemplate.queryForObject(sql, rowMapper,id); return employee; }
}
package com.spring.jdbc; import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map; import javax.sql.DataSource; import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource; public class JdbcTest { private ApplicationContext ctx=null;
private JdbcTemplate jdbcTemplate=null;
private EmployeeDao employeeDao ;
private DepartmentDao departmentDao ;
private NamedParameterJdbcTemplate namedParameterJdbcTemplate=null;
{
ctx=new ClassPathXmlApplicationContext("beans-dataSource.xml");
jdbcTemplate =(JdbcTemplate) ctx.getBean("jdbcTemplate");
employeeDao = ctx.getBean(EmployeeDao.class);
departmentDao = ctx.getBean(DepartmentDao.class);
namedParameterJdbcTemplate=(NamedParameterJdbcTemplate) ctx.getBean("namedParameterJdbcTemplate"); } /**
* 使用具名参数时, 可以使用 update(String sql, SqlParameterSource paramSource) 方法进行更新操作
* 1. SQL 语句中的参数名和类的属性一致!
* 2. 使用 SqlParameterSource 的 BeanPropertySqlParameterSource 实现类作为参数.
*/
@Test
public void testNamedParameterJdbcTemplate2(){
String sql="INSERT INTO employees(last_name,email,dept_id) VALUES(:lastName,:email,:deptId)";
Employee employee=new Employee();
employee.setLastName("LKQ");
employee.setEmail("lkq@qq.com");
employee.setDeptId(2); SqlParameterSource sqlParameterSource =new BeanPropertySqlParameterSource(employee);
namedParameterJdbcTemplate.update(sql, sqlParameterSource); }
/**
* 可以为参数起名字.
* 1. 好处: 若有多个参数, 则不用再去对应位置, 直接对应参数名, 便于维护
* 2. 缺点: 较为麻烦.
*/
@Test
public void testNamedParameterJdbcTemplate(){
String sql="INSERT INTO employees(last_name,email,dept_id) VALUES(:name,:email,:deptid)";
Map<String,Object> paramMap=new HashMap<>();
paramMap.put("name", "XJP");
paramMap.put("email", "xjp@qq.com");
paramMap.put("deptid",001); namedParameterJdbcTemplate.update(sql, paramMap);
} @Test
public void testDepartmentDao(){
System.out.println(departmentDao.get(2));
}
@Test
public void testEmployeeDao(){
System.out.println(employeeDao.get(2));
} /**
* 从数据库中获取记录对象集合
*/
@Test
public void testQueryForList(){
String sql="SELECT id,last_name lastName,email,dept_id FROM employees WHERE id>?";
RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);
List<Employee> employees=jdbcTemplate.query(sql, rowMapper,8); System.out.println(employees);
} /**
* 从数据库中获取单个列的值，统计查询
*/
@Test
public void testQueryForObject2(){
String sql="SELECT count(id) FROM employees";
long count=jdbcTemplate.queryForObject(sql, Long.class);
System.out.println(count);
} /**
* 从数据库中获取一条记录, 实际得到对应的一个对象
*/
@Test
public void testQueryForObject(){
String sql="SELECT id,last_name lastName,email,dept_id FROM employees WHERE id=?";
RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);
Employee employee=jdbcTemplate.queryForObject(sql, rowMapper,2);
System.out.println(employee);
} /**
* 执行批量更新: 批量的 INSERT, UPDATE, DELETE
* 最后一个参数是 Object[] 的 List 类型: 因为修改一条记录需要一个 Object 的数组, 那么多条不就需要多个 Object 的数组吗
*/
@Test
public void testBatchUpdate(){
String sql="INSERT INTO employees(last_name,email,dept_id) VALUES(?,?,?)"; List<Object[]> batchArgs=new ArrayList<>();
batchArgs.add(new Object[]{"AA", "aa@atguigu.com", 1});
batchArgs.add(new Object[]{"BB", "bb@atguigu.com", 2});
batchArgs.add(new Object[]{"CC", "cc@atguigu.com", 3});
batchArgs.add(new Object[]{"DD", "dd@atguigu.com", 3});
batchArgs.add(new Object[]{"EE", "ee@atguigu.com", 2}); jdbcTemplate.batchUpdate(sql, batchArgs);
}
/**
* 执行 INSERT, UPDATE, DELETE
*/
@Test
public void testUpdate(){
String sql="UPDATE employees SET last_name = ? WHERE id=?";
jdbcTemplate.update(sql,"王根深",2);
}
@Test
public void testDataSource() throws SQLException{
DataSource dataSource =(DataSource) ctx.getBean("dataSource");
System.out.println(dataSource.getConnection());
}
}