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新建BaseDao
package cn.wingfly.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class BaseDao { Connection con = null; Statement st = null; ResultSet rs = null; /** * 獲得聯接 * * @return */ public Connection getConnection() { try { // 加載驅動,這一句也可寫為:Class.forName("com.mysql.jdbc.Driver"); Class.forName("com.mysql.jdbc.Driver").newInstance(); // 建立到MySQL的連接 con = DriverManager.getConnection("jdbc:mysql://localhost:3306/money_note?characterEncoding=UTF-8", "root", "root"); } catch (Exception e) { e.printStackTrace(); } return con; } /** * 關閉數據源 */ public void CloseConnection(Connection con, Statement s, ResultSet rs) { try { if (rs != null) { rs.close(); } if (s != null) { s.close(); } if (con != null) { con.close(); } } catch (SQLException e) { e.printStackTrace(); } } }測試類
package cn.wingfly.dao; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class Test extends BaseDao { Connection con = null; Statement st = null; ResultSet rs = null; /** * 查詢數據 */ public void find() { con = getConnection(); // 獲得聯接 try { st = con.createStatement(); rs = st.executeQuery("select * from app_user"); while (rs.next()) { System.out.println("編號:" + rs.getInt("uuid") + ", 姓名:" + rs.getString("userName") + ", 性別:" + rs.getString("sex") + ", 生日:" + rs.getString("birthday") + ", 住址:" + rs.getString("address")); } } catch (SQLException e) { e.printStackTrace(); } finally { CloseConnection(con, st, rs); // 關閉聯接 } } /** * 添加數據 */ public void add() { con = getConnection(); try { st = con.createStatement(); int result = st.executeUpdate("insert into app_user(userName,passWord,sex,birthday,address) values('趙麗穎','wanying','女','1992-02-03','北京市')"); if (result > 0) { System.out.println("插入成功"); } else { System.out.println("插入失敗"); } } catch (SQLException e) { System.out.println("插入失敗"); e.printStackTrace(); } finally { CloseConnection(con, st, rs); } } /** * 更新數據 */ public void update() { con = getConnection(); try { st = con.createStatement(); int result = st.executeUpdate("update app_user set address = '河南' where uuid = '3'"); if (result > 0) { System.out.println("更新成功"); } else { System.out.println("更新失敗"); } } catch (SQLException e) { e.printStackTrace(); } finally { CloseConnection(con, st, rs); } } /** * 刪除數據 */ public void delete() { con = getConnection(); try { st = con.createStatement(); int result = st.executeUpdate("delete from app_user where uuid = '3'"); if (result > 0) { System.out.println("刪除成功"); } else { System.out.println("刪除失敗"); } } catch (SQLException e) { e.printStackTrace(); } finally { CloseConnection(con, st, rs); } } public static void main(String[] args) { Test test = new Test(); //test.add(); // test.update(); test.delete(); test.find(); } }