JdbcTemplate主要提供以下五类方法：
- execute方法：可以用于执行任何SQL语句，一般用于执行DDL语句；
- update方法及batchUpdate方法：update方法用于执行新增、修改、删除等语句；batchUpdate方法用于执行批处理相关语句；
- query方法及queryForXXX方法：用于执行查询相关语句；
- call方法：用于执行存储过程、函数相关语句。
JdbcTemplate提供的接口测试：
第一步：导入包
a）导入mysql驱动包
b）导入spring包
b）导入C3P0依赖包：
第二步：新建spring配置文件（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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
<!-- 导入资源文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 自动扫描的包 -->
<context:component-scan base-package="com.dx.jdbc"></context:component-scan>
<!-- 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="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.dirverClass}"></property>
<property name="initialPoolSize" value="${jdbc.initialPoolSize}"></property>
<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
<property name="minPoolSize" value="${jdbc.minPoolSize}"></property>
</bean>
<!-- 配置Spring 的 JdbcTemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
</beans>
db.properties资源配置文件：
jdbc.user=root jdbc.password=123456 jdbc.jdbcUrl=jdbc:mysql://localhost/test_spring_jdbc jdbc.dirverClass=com.mysql.jdbc.Driver jdbc.initialPoolSize=5 jdbc.maxPoolSize=50 jdbc.minPoolSize=3
第三步：新建测试类：
Department.java
package com.dx.jdbc;
public class Department {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Department [id=" + id + ", name=" + name + "]";
}
}
Employee.java
package com.dx.jdbc;
public class Employee {
private Integer id;
private String username;
private Department department;
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 Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
@Override
public String toString() {
return "Employee [id=" + id + ", username=" + username + ", department=" + department + "]";
}
}
JdbcTemplateTest.java测试类
package com.dx.jdbc;
import java.util.List;
import java.sql.SQLException;
import java.util.ArrayList;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
public class JdbcTemplateTest {
static ApplicationContext ctx = null;
static DataSource dataSource = null;
static JdbcTemplate jdbcTemplate = null;
static {
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
dataSource = (DataSource) ctx.getBean("dataSource");
try {
System.out.println(dataSource.getConnection());
} catch (SQLException e) {
e.printStackTrace();
}
jdbcTemplate = (JdbcTemplate) ctx.getBean("jdbcTemplate");
}
public static void main(String[] args) throws SQLException {
// testCreate();
// testUpdate();
// getEntity();
// getList();
// testQueryForObject();
}
private static void testQueryForObject() {
String sql = "select count(id) from employee";
long count = jdbcTemplate.queryForObject(sql, Long.class);
System.out.println(count);
}
private static void getList() {
String sql = "select id,username,depart_id from employee where id>?";
RowMapper<Employee> rowMapper = new BeanPropertyRowMapper<>(Employee.class);
List<Employee> employees = jdbcTemplate.query(sql, rowMapper, 1);
System.out.println(employees);
}
/**
* 注意dpartment不能级联查询，原因：jdbcTemplate是一个小工具，不是ORM框架。
*/
private static void getEntity() {
String sql = "select id,username,depart_id from employee where id=?";
RowMapper<Employee> rowMapper = new BeanPropertyRowMapper<>(Employee.class);
Employee employee = jdbcTemplate.queryForObject(sql, rowMapper, 1);
System.out.println(employee);
}
private static void testCreate() {
String sql = "insert into department(id,name)values(?,?)";
List<Object[]> batchArgs = new ArrayList<Object[]>();
batchArgs.add(new Object[] { 1, "软件开发部" });
batchArgs.add(new Object[] { 2, "财务部" });
batchArgs.add(new Object[] { 3, "人力资源部" });
batchArgs.add(new Object[] { 4, "企业文化部" });
batchArgs.add(new Object[] { 5, "市场部" });
jdbcTemplate.batchUpdate(sql, batchArgs);
sql = "insert into employee(id,username,depart_id)values(?,?,?)";
batchArgs = new ArrayList<Object[]>();
batchArgs.add(new Object[] { 1, "张三", 1 });
batchArgs.add(new Object[] { 2, "李四", 1 });
batchArgs.add(new Object[] { 3, "王五", 2 });
batchArgs.add(new Object[] { 4, "马六", 4 });
batchArgs.add(new Object[] { 5, "小七", 5 });
jdbcTemplate.batchUpdate(sql, batchArgs);
}
/**
* 修改
*/
private static void testUpdate() {
String sql = "update department set name=? where id=? ";
jdbcTemplate.update(sql, "开发部", 1);
}
}
开发中应用：
应用一：Dao类注入jdbcTemplate
package com.dx.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;
/**
* 根据id获取employee实体
*
* @param id
* employee id信息
*/
public Employee get(Integer id) {
String sql = "select id,username,depart_id from employee where id=?";
RowMapper<Employee> rowMapper = new BeanPropertyRowMapper<>(Employee.class);
Employee employee = jdbcTemplate.queryForObject(sql, rowMapper, id);
return employee;
}
}
调用测试：
package com.dx.jdbc;
import java.util.List;
import java.sql.SQLException;
import java.util.ArrayList;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
public class JdbcTemplateTest {
static ApplicationContext ctx = null;
static EmployeeDao employeeDao = null;
static {
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
jdbcTemplate = (JdbcTemplate) ctx.getBean("jdbcTemplate");
employeeDao = (EmployeeDao) ctx.getBean("employeeDao");
}
public static void main(String[] args) throws SQLException {
testDao();
}
private static void testDao() {
System.out.println(employeeDao.get(1));
}}
应用二：Dao类依赖JdbcDaoSupport
package com.dx.jdbc;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
import org.springframework.stereotype.Repository;
@Repository
public class DepartmentDao extends JdbcDaoSupport {
@Autowired
public void setDataSource2(DataSource dataSource) {
setDataSource(dataSource);
}
/**
* 根据id获取department实体
*
* @param id
* department id信息
*/
public Department get(Integer id) {
String sql = "select id,name from department where id=?";
RowMapper<Department> rowMapper = new BeanPropertyRowMapper<>(Department.class);
Department department = getJdbcTemplate().queryForObject(sql, rowMapper, id);
return department;
}
}
调用测试：
package com.dx.jdbc;
import java.util.List;
import java.sql.SQLException;
import java.util.ArrayList;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
public class JdbcTemplateTest {
static ApplicationContext ctx = null;
static DepartmentDao departmentDao = null;
static {
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
departmentDao = (DepartmentDao) ctx.getBean("departmentDao");
}
public static void main(String[] args) throws SQLException {
testDaoSupport();
}
private static void testDaoSupport() {
System.out.println(departmentDao.get(1));
}}
NamedParameterJdbcTemplate具名参数操作对象：
使用如下：
package com.dx.jdbc;
import java.util.List;
import java.util.Map;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
public class JdbcTemplateTest {
static ApplicationContext ctx = null;
static NamedParameterJdbcTemplate namedParameterJdbcTemplate = null;
static {
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
namedParameterJdbcTemplate = (NamedParameterJdbcTemplate) ctx.getBean("namedParameterJdbcTemplate");
}
public static void main(String[] args) throws SQLException {
testInsert();
testInsertModel();
}
private static void testInsertModel() {
String sql = "insert into department(id,name)values(:id,:name)";
Department department = new Department();
department.setId(100);
department.setName("name100");
SqlParameterSource parameterSource = new BeanPropertySqlParameterSource(department);
namedParameterJdbcTemplate.update(sql, parameterSource);
}
private static void testInsert() {
String sql = "insert into department(id,name)values(:id,:name)";
Map<String, String> paramMap = new HashMap<>();
paramMap.put("id", "99");
paramMap.put("name", "name99");
namedParameterJdbcTemplate.update(sql, paramMap);
}
}
原文地址：https://www.cnblogs.com/yy3b2007com/p/9153284.html
时间： 2024-08-01 13:17:00