JDBC Statement实现数据库增删改查案例-蒲公英云

JDBC Statement实现数据库增删改查案例

JDBC Statement实现数据库增删改查案例:

博主在数据库中创建person表,字段信息如下：

Center

项目中需要的包为：ojdbc.jar

Center 1

示例代码：

1.Main.java

package com.company;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Main {
    public static void main(String[] args) {
        //执行插入语句
        int update = DBUtils.executeUpdate("INSERT INTO person(name,psw,age,sex,description) VALUES('李四','123',18,'男','个人说明')");
        System.out.println(update > 0 ? "添加成功" : "添加失败");
        //执行查询语句
        DBUtils.RS dbRS = DBUtils.executeQuery("SELECT name,psw,age FROM person WHERE personid=42");
        ResultSet rs = dbRS.getRs();
        try {
            if (rs.next()) {
                String name = rs.getString("name");
                String psw = rs.getString("psw");
                int age = rs.getInt("age");
                System.out.println("查询结果： 姓名：" + name + "  密码：" + psw + "  年龄：" + age);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            dbRS.close();
        }
        //执行修改语句
        int i = DBUtils.executeUpdate("UPDATE person SET age=36 WHERE personid=42");
        System.out.println(i > 0 ? "修改成功" : "修改失败");
        //执行删除语句
        int i1 = DBUtils.executeUpdate("DELETE FROM person WHERE personid=42");
        System.out.println(i1 > 0 ? "删除成功" : "删除失败");
    }
}

2.DBUtils.java

package com.company;
import java.sql.*;
public class DBUtils {
    /**
     * 数据库的属性信息
     */
//    数据库主机 IP地址
    private static final String IP = "127.0.0.1";
    //    数据库端口
    private static final String PORT = "1521";
    //    数据库名称？
    private static final String DB_NAME = "oracle";
    //    数据库URL
    private static final String URL = "jdbc:oracle:thin:@" + IP + ":" + PORT + ":" + DB_NAME;
    //     数据库连接用户名
    private static final String USER = "scott";
    //     用户密码
    private static final String PSW = "tiger";
    //    获取数据库连接
    public static Connection getConn() {
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(URL, USER, PSW);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    //    执行查询语句方法
    public static RS executeQuery(String sql) {
        Connection conn = null;
        Statement st = null;
        try {
            conn = DBUtils.getConn();
            st = conn.createStatement();
            ResultSet rs = st.executeQuery(sql);
            return new RS(conn, st, rs);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
    //    执行更新语句方法
    public static int executeUpdate(String sql) {
        Connection conn = null;
        Statement st = null;
        try {
            conn = DBUtils.getConn();
            st = conn.createStatement();
            int i = st.executeUpdate(sql);
            return i;
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            close(conn, st);
        }
        return 0;
    }
    //    释放连接资源
    public static void close(ResultSet rs) {
        close(null, null, rs);
    }
    //    释放连接资源
    public static void close(Connection conn) {
        close(conn, null, null);
    }
    //    释放连接资源
    public static void close(Connection conn, Statement st) {
        close(conn, st, null);
    }
    //    释放连接资源
    public static void close(Connection conn, Statement st, ResultSet rs) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (st != null) {
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    public static class RS {
        private Connection conn = null;
        private Statement st = null;
        private ResultSet rs;
        public RS(Connection conn, Statement st, ResultSet rs) {
            this.conn = conn;
            this.st = st;
            this.rs = rs;
        }
        public ResultSet getRs() {
            return this.rs;
        }
        public void close() {
            DBUtils.close(conn, st, rs);
        }
    }
}