JDBC 连接Oracle 数据库,JDBC 连接Mysql 数据库
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首先是JDBC 连接Oracle 数据库
package com.util; import com.pojo.UserInfo; import java.sql.*; public class DBConnection { private static Connection conn; private static String userName = "scott"; private static String passWord = "tiger"; private static String url; static { url = "jdbc:oracle:thin:@localhost:1521:orcl"; } public static Connection getConnection() { try { Class.forName("oracle.jdbc.OracleDriver"); conn = DriverManager.getConnection(url, userName, passWord); } catch (Exception e) { e.printStackTrace(); } return conn; } //关闭资源的方法 public static void closeResource(ResultSet rs, PreparedStatement pstmt, Connection conn) { try { if (null != rs) { rs.close(); } if (null != pstmt) { pstmt.close(); } if (null != conn) { conn.close(); } } catch (SQLException e) { e.printStackTrace(); System.out.println("关闭资源出现问题--"); } } public static void main(String[] args) { ResultSet resultSet = null; PreparedStatement preparedStatement = null; Connection conn; DBConnection db = new DBConnection(); conn = db.getConnection(); String sql = "select * from userInfo "; try { preparedStatement = conn.prepareStatement(sql); resultSet = preparedStatement.executeQuery(); while (resultSet.next()){ UserInfo u = new UserInfo(); u.setUsername(resultSet.getString("username")); System.out.println("用户信息: 用户名为:"+ u.getUsername()); } } catch (SQLException e) { e.printStackTrace(); }finally { closeResource(resultSet,preparedStatement,conn); } } }
然后是JDBC 连接mysql 数据库 模板
package com.util; import com.pojo.UserInfo; import java.sql.*; public class DBConnectionMySql { private static Connection conn; private static String userName = "root"; private static String passWord = "tiger"; private static String url; private static String driver; static { url = "jdbc:mysql://localhost:3306/wlc"; driver = "com.mysql.jdbc.Driver"; } public static Connection getConnection() { try { Class.forName(driver); conn = DriverManager.getConnection(url, userName, passWord); } catch (Exception e) { e.printStackTrace(); } return conn; } //关闭资源的方法 public static void closeResource(ResultSet rs, PreparedStatement pstmt, Connection conn) { try { if (null != rs) { rs.close(); } if (null != pstmt) { pstmt.close(); } if (null != conn) { conn.close(); } } catch (SQLException e) { e.printStackTrace(); System.out.println("关闭资源出现问题--"); } } public static void main(String[] args) { ResultSet resultSet = null; PreparedStatement preparedStatement = null; Connection conn; DBConnectionMySql db = new DBConnectionMySql(); conn = db.getConnection(); String sql = "select * from userInfo "; try { preparedStatement = conn.prepareStatement(sql); resultSet = preparedStatement.executeQuery(); while (resultSet.next()){ UserInfo u = new UserInfo(); u.setUsername(resultSet.getString("username")); System.out.println("用户信息: 用户名为:"+ u.getUsername()); } } catch (SQLException e) { e.printStackTrace(); }finally { closeResource(resultSet,preparedStatement,conn); } } }
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