spring框架

Posted 2021-11-25 hsx1996

package cn.hu1.com;
import JDBCUtils.JDBCUtils;
import org.springframework.jdbc.core.JdbcTemplate;

public class DemoTemplate {
    public static void main(String[] args) {
        // 1 导包
        // 2 创建JDBCTemplate 对象 依赖于DataSource
        JdbcTemplate jt = new JdbcTemplate(JDBCUtils.getDs());
        // 3 调用JdbcTemplate方法 CRUD
        //String sql = "insert into emppme values(7,?,?)";
        String  sql = "update emppme set gender = 0 where uname = ?";
        int i = jt.update(sql, "孙悟空");
        System.out.println(i);
    }
}

package JDBCUtils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * Druid连接池工具类
 * */
public class JDBCUtils {
    // 1 定义成员变量
    private static DataSource ds;
    static {
        try {
            // 2 加载配置文件  获得连接池
            Properties pp = new Properties();
            pp.load(JDBCUtils.class.getClassLoader().getResourceAsStream("Druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(pp);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    // 获得连接
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
    //释放资源
    public static void close(Statement sm, Connection conn) {
        if (sm != null) {
            try {
                sm.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    //释放资源
    public static void close(ResultSet rs, Statement sm, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (sm != null) {
            try {
                sm.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    public static  DataSource getDs(){
        return ds;
    }
}