……………………………………………………………精品资料推荐………………………………………………… import java.sql.*; public class JDBCConn{ private String url=""; private String username=""; private String password=""; /** *
方法说明:获得数据连接 *
输入参数: *
返回类型:Connection 连接对象 */ public Connection conn(){ try { //加载JDBC驱动 Class.forName("oracle.jdbc.driver.OracleDriver"); //创建数据库连接 Connection con DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:ORCL", "test", "test"); return con; }catch(ClassNotFoundException cnf){ System.out.println("driver not find:"+cnf); return null; }catch(SQLException sqle){ System.out.println("can't connection db:"+sqle); return null; } catch (Exception e) { System.out.println("Failed to load JDBC/ODBC driver."); return null; } } /** *
方法说明:执行查询SQL语句 *
输入参数:Connection con 数据库连接 *
输入参数:String sql 要执行的SQL语句 *
返回类型: */ public void query(Connection con, String sql){ try{ if(con==null){ throw new Exception("database connection can't use!"); } if(sql==null) throw new Exception("check your parameter: 'sql'! don't input null!"); //声明语句 Statement stmt = con.createStatement(); //执行查询 1 = ……………………………………………………………精品资料推荐………………………………………………… ResultSet rs = stmt.executeQuery(sql); ResultSetMetaData rmeta = rs.getMetaData(); //获得数据字段个数 int numColumns = rmeta.getColumnCount(); while(rs.next()) { for(int i = 0;i< numColumns;i++) { String sTemp = rs.getString(i+1); System.out.print(sTemp+" "); } System.out.println(""); } }catch(Exception e){ System.out.println("query error:"+e); } } /** *
方法说明:执行插入、更新、删除等没有返回结果集的SQL语句 *
输入参数:Connection con 数据库连接 *
输入参数:String sql 要执行的SQL语句 *
返回类型: */ public void execute(Connection con, String sql){ try{ if(con==null) return; Statement stmt = con.createStatement(); stmt.executeUpdate(sql); }catch(Exception e){ System.out.println("execute error: sql = "+sql); System.out.println(e); } } /** *
方法说明:实例演示 *
输入参数: *
返回类型: */ public void demo(){ try{ JDBCConn oc = new JDBCConn(); Connection conn = oc.conn(); String sql = "insert 2 into ……………………………………………………………精品资料推荐………………………………………………… TBL_USER(id,name,password)values(seq_user.nextval,'switch','haorenpingan')"; oc.execute(conn,sql); sql = "select * from TBL_USER"; oc.query(conn,sql); conn.close(); }catch(SQLException se){ System.out.println(se); }catch(Exception e){ System.out.println(e); } } /** *
方法说明:主方法 *
输入参数: *
返回类型: */ public static void main(String[] arg){ if(arg.length!=3){ System.out.println("use: java JDBCConn url username password"); return; } JDBCConn oc = new JDBCConn(); oc.url = arg[0]; oc.username=arg[1]; oc.password=arg[2]; oc.demo(); } } 3 本文来源:https://www.wddqw.com/doc/bfc609681b2e453610661ed9ad51f01dc381577a.html