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1.1 项目目录

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1.2 代码示例

账户实体类

package cn.guardwhy.domain;/** * 账户实体类 */@Data@NoArgsConstructor@AllArgsConstructorpublic class Account {       private Integer id;    private String name;    private Float money;}

测试代码

package cn.guardwhy.jdbc;import cn.guardwhy.domain.Account;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;/** * spring JdbcTemplate实现完整CRUD操作 */public class JdbcTemplateCRUD {       public static void main(String[] args) {           // 1.加载spring配置文件,创建spring IOC容器        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:bean.xml");        // 2.从spring IOC容器中,获取JdbcTemplate        JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");        // 3.查询多行        List
   
     list = jdbcTemplate.query("select id,name,money from account", new RowMapper
    
     () {               @Override            public Account mapRow(ResultSet rs, int index) throws SQLException {                   // 创建账户对象                Account account = new Account();                account.setId(rs.getInt("id"));                account.setName(rs.getString("name"));                account.setMoney(rs.getFloat("money"));                return account;            }        });        // 4.打印结果集        for(Account account:list){               System.out.println(account);        }        // 5.查询一行一列        System.out.println("查询一行一列-------");        Integer accountNum = jdbcTemplate.queryForObject("select count(*) from account", Integer.class);        System.out.println("当前账户数量:" + accountNum);    }}
    
   

执行结果

1.3 自定义RowMapper

package cn.guardwhy.resources;import cn.guardwhy.domain.Account;import org.springframework.jdbc.core.RowMapper;import java.sql.ResultSet;import java.sql.SQLException;public class AccountRowMapper implements RowMapper
   
     {       /**     * 结果集映射的方法：     *      结果集中的每一行记录，都会调用一次该方法     */    public Account mapRow(ResultSet rs, int index) throws SQLException{           // 创建账户对象        Account account = new Account();        account.setId(rs.getInt("id"));        account.setName(rs.getString("name"));        account.setMoney(rs.getFloat("money"));        return account;    }}
   

1.4 测试代码

package cn.guardwhy.jdbc;import cn.guardwhy.domain.Account;import cn.guardwhy.resources.AccountRowMapper;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.JdbcTemplate;import java.util.List;/** * spring JdbcTemplate实现完整CRUD操作 */public class JdbcTemplateCRUD {       public static void main(String[] args) {           // 1.加载spring配置文件,创建spring IOC容器        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:bean.xml");        // 2.从spring IOC容器中,获取JdbcTemplate        JdbcTemplate jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");        // 3.使用自定义的RowMapper        List
   
     list = jdbcTemplate.query("select * from account", new AccountRowMapper());        // 4.打印结果集        for(Account account:list){               System.out.println(account);        }        // 5.查询一行一列        System.out.println("查询一行一列-------");        Integer accountNum = jdbcTemplate.queryForObject("select count(*) from account", Integer.class);        System.out.println("当前账户数量:" + accountNum);    }}
   

1.5 执行结果

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