JDBC連接示例

• 2、首先獲取Connection
• 2、使用連接進行增刪
• • 2.1 insert示例
  • delete示例

2、首先獲取Connection

獲取連接代碼

private static Connection getConn() {String driver = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://ip:端口/數(shù)據(jù)庫名?連接參數(shù)";String username = "用戶名";String password = "密碼";Connection conn = null;try {Class.forName(driver); //classLoader,加載對應(yīng)驅(qū)動conn = (Connection) DriverManager.getConnection(url, username, password);} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}return conn;}

2、使用連接進行增刪

2.1 insert示例

private static void insert() throws SQLException {//1.獲取連接Connection conn = getConn();try {conn.setAutoCommit(false);//2.獲得預(yù)處理對象String sql = "insert into table_user (id,name) values (?,?)";PreparedStatement pstmt;pstmt = (PreparedStatement) conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);//3.SQL語句占位符設(shè)置實際參數(shù)pstmt.setLong(1, 1L);pstmt.setString(2, "Tony Stark");//4.執(zhí)行SQL語句int line = pstmt.executeUpdate();conn.commit();System.out.println("更新記錄數(shù)"+ line);} catch (SQLException e) {e.printStackTrace();}finally {//5.關(guān)閉資源conn.close();}}

delete示例

private static void delete() {//1.獲取連接Connection conn = getConn();try {//2.獲得預(yù)處理對象String sql = "delete from table_user where id = 1";Statement statement = connection.createStatement();//4.執(zhí)行SQL語句int result = statement.executeUpdate(sql);if (result != 0) {System.out.println("操作成功,受影響" + result + "行");}} catch (SQLException e) {e.printStackTrace();} finally {//5.關(guān)閉資源conn.close();}}

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