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package demo.jdbc; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class JdbcConn { /** *JDBC (Java Data Base Connectivity) 数据库连接,有以下几个步骤: *1.加载驱动程序 Class.forName(driver); *2.创建连接对象 Connection con = DriverManager.getConnection(url,username,password); *3.创建sql语句的执行对象 *4.执行sql语句 *5.对执行结果进行处理 *6.关闭相关连接对象 (顺序跟声明的顺序相反)。 */ public static void main(String[] args) { String mysqlDriver = "com.mysql.jdbc.Driver" ; String mysqlUrl = "jdbc:mysql://localhost:3306/mybase" ; String mysqlUser = "root" ; String mysqlPass = "111" ; String oracleDriver = "oracle.jdbc.driver.OracleDriver" ; String oracleUrl = "jdbc:oracle:thin:@localhost:1521:XE" ; String userName = "zl" ; String passWord = "444" ; String sql = "select ename from emp" ; try { Class.forName(oracleDriver); } catch (ClassNotFoundException e) { System.out.println( "找不到驱动" ); e.printStackTrace(); } Connection conn = null ; try { conn = DriverManager.getConnection(oracleUrl, userName,passWord ); } catch (SQLException e) { System.out.println( "数据库连接错误" ); e.printStackTrace(); } Statement st = null ; try { st = conn.createStatement(); } catch (SQLException e) { System.out.println( "创建数据库声明类错误" ); e.printStackTrace(); } boolean flag = false ; int rows = 0 ; ResultSet rs = null ; try { flag = st.execute(sql); rows = st.executeUpdate(sql); rs = st.executeQuery(sql); while (rs.next()){ //通过列的标号来查询数据; String name =rs.getString( 1 ); //通过列名来查询数据 String name2 = rs.getString( "ename" ); System.out.println(name); } } catch (SQLException e) { System.out.println( "测试--" ); e.printStackTrace(); } //关闭数据连接对象 try { if (rs!= null ){ rs.close(); } if (st!= null ){ st.close(); } if (conn!= null ){ conn.close(); } } catch (SQLException e) { e.printStackTrace(); } } } |
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原文链接:http://www.cnblogs.com/tashaxing/p/7501526.html