curd

  • 1. 实现步骤
  • 2. maven dependency
  • 3. curd代码
  1. database: oracle
  2. dataSource: alibaba druid

1. 实现步骤

1. 导入spring-jdbc 和 spring-tx(事务)坐标
2. 创建数据库表和实体
3.创建JdbcTemplate对象JdbcTemplate jdbc = new JdbcTemplate();jdbc.setDataSource(dataSource);
4. 执行数据库操作更新操作jdbc.update(sql, params)查询操作jdbc.query(sql, Mapper, params)jdbc.queryForObject(sql, Mapper, params)

2. maven dependency

       <!-- 数据源配置 为jdbc template 拿到连接--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><!-- oracle 数据库驱动 --><dependency><groupId>com.oracle.database.jdbc</groupId><artifactId>ojdbc6</artifactId><version>11.2.0.4</version></dependency><!-- jdbc template --><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>4.3.8.RELEASE</version></dependency><!-- 事务相关配置 transaction--><dependency><groupId>com.labun</groupId><artifactId>spring-tx</artifactId><version>5.2.1.RELEASE.patched</version></dependency>

3. curd代码

package com.lovely.jdbc_template;import com.lovely.entity.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.BeanPropertyRowMapper;import java.util.List;/*** @author echo lovely* @date 2020/8/7 17:36*/public class SpringJdbcTemplateCurd {private static final JdbcTemplate jdbcTemplate;static {ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");jdbcTemplate = app.getBean(JdbcTemplate.class);}public static void main(String[] args) {// save();// queryAllUsers();queryOne();queryCount();}// 查询单个static void queryOne() {User user = jdbcTemplate.queryForObject("select * from users where id = ?", new BeanPropertyRowMapper<User>(User.class), 1);System.out.println(user);}// 查询行数static void queryCount() {Integer count = jdbcTemplate.queryForObject("select count(*) from users", Integer.class);System.out.println(count);}// 查询全部static void queryAllUsers() {List<User> query = jdbcTemplate.query("select * from users", new BeanPropertyRowMapper<User>(User.class));System.out.println(query);}public static void save() {jdbcTemplate.update("insert into users values (?, ?, ?)", new Object[]{5, "gorgeous", 111});}public void update() {String sql = "update users set name=? where id=?";jdbcTemplate.update(sql, new Object[]{"小李子", 4});}public void delete() {jdbcTemplate.update("delete from user where id = ?", new Object[]{5});}}
  • spring xml配置 （将DataSource和JdbcTemplate的创建交给IOC容器）
    <!-- 扫描配置文件 导入spring context --><context:property-placeholder location="classpath:jdbc.properties" /><!-- spring 创建jdbc模板 --><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"><property name="driverClassName" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.userName}"/><property name="password" value="${jdbc.userPassword}"/></bean><!-- 创建jdbc模板 --><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"></property></bean>