规范和封装jdbc程序代码
JDBC 部分方法引用工具类
1 package it.cast.jdbc; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 import java.sql.Statement; 8 9 public class jdbcUtils { 10 11 private static String url = "jdbc:mysql://localhost:3306/jdbc"; 12 private static String user = "root"; 13 private static String password = "123"; 14 15 private jdbcUtils() { 16 17 } 18 19 static { 20 try { 21 Class.forName("com.mysql.jdbc.Driver"); 22 } catch (ClassNotFoundException e) { 23 e.printStackTrace(); 24 } 25 } 26 27 public static Connection getConnection() throws SQLException { 28 return DriverManager.getConnection(url, user, password); 29 } 30 31 public static void free(ResultSet rs, Statement st, Connection conn) { 32 33 try { 34 if (rs != null) 35 rs.close(); 36 } catch (SQLException e) { 37 e.printStackTrace(); 38 } finally { 39 40 try { 41 if (st != null) 42 st.close(); 43 } catch (SQLException e) { 44 e.printStackTrace(); 45 } finally { 46 47 try { 48 if (conn != null) 49 conn.close(); 50 } catch (SQLException e) { 51 e.printStackTrace(); 52 } 53 } 54 55 } 56 57 } 58 }
1 package it.cast.jdbc; 2 3 import java.sql.Connection; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 import java.sql.Statement; 7 8 public class Base { 9 10 static Connection conn = null; 11 12 public static void main(String[] args) throws SQLException, ClassNotFoundException { 13 test(); 14 } 15 16 static void test() throws SQLException, ClassNotFoundException { 17 18 19 // 2.建立连接 20 conn = jdbcUtils.getConnection(); 21 22 // 3.创建语句 23 Statement st = conn.createStatement(); 24 25 // 4.执行语句 26 ResultSet rs = st.executeQuery("select * from user"); 27 28 // 5.处理结果 29 while (rs.next()) { 30 System.out.println(rs.getObject(1) + "\t" + rs.getObject(2) + "\t" 31 + rs.getObject(3)+"\t" + rs.getObject(4)); 32 } 33 34 //6.释放资源 35 jdbcUtils.free(rs, st, conn); 36 } 37 38 }
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