標籤:localhost private 資料庫連接 oracle
public class DBCon {// 資料庫驅動對象public static final String DRIVER = "oracle.jdbc.driver.OracleDriver";// 資料庫連接地址(資料庫名)public static final String URL = "jdbc:oracle:thin:@localhost:1521:orcl";// 登陸名public static final String USER = "scott";// 登陸密碼public static final String PWD = "123456";// 建立資料庫連接對象private Connection con = null;// 建立資料庫先行編譯對象private PreparedStatement ps = null;// 建立結果集private ResultSet rs = null;// 建立資料來源對象public static DataSource source = null;public Connection getCon() {try{Class.forName(DRIVER);con = DriverManager.getConnection(URL, USER, PWD);System.out.println("資料庫連接成功!");} catch (Exception e) {System.err.println("資料庫連接失敗!");e.printStackTrace();}return con;}public void closeAll() {if (rs != null)try {rs.close();} catch (SQLException e) {e.printStackTrace();}if (ps != null)try {ps.close();} catch (SQLException e) {e.printStackTrace();}if (con != null)try {con.close();} catch (SQLException e) {e.printStackTrace();}}public int update(String sql,String... pras){ int resu=0; con=getCon(); try { ps=con.prepareStatement(sql); for(int i=0;i<pras.length;i++){ ps.setString(i+1,pras[i]); } resu=ps.executeUpdate(); } catch (SQLException e) { } finally{ closeAll(); } return resu; } public ResultSet query(String sql,String... pras){ con=getCon(); try { ps=con.prepareStatement(sql); if(pras!=null) for(int i=0;i<pras.length;i++){ ps.setString(i+1, pras[i]); } rs=ps.executeQuery(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return rs; } public static void main(String[] args) throws SQLException {DBCon dbCon = new DBCon();//dbCon.getCon();ResultSet resultSet = dbCon.query("select * from emp", null);while (resultSet.next()) {System.out.printf("%-10d",resultSet.getInt(1)); //輸出10列,靠左對齊(-號表示靠左對齊)//System.out.print(resultSet.getInt(1) + "\t\t");System.out.printf("%-10s",resultSet.getString(2)); //System.out.print(resultSet.getString(2) + "\t\t");System.out.printf("%-20s",resultSet.getString(3)); //System.out.print(resultSet.getString(3) + "\t\t\t\t");System.out.printf("%-10d",resultSet.getInt(4)); //System.out.print(resultSet.getInt(4) + "\t\t");System.out.print(resultSet.getDate(5) + "\t\t");System.out.print(resultSet.getDouble(6) + "\t\t");System.out.print(resultSet.getDouble(7) + "\t\t");System.out.println(resultSet.getInt(8));}dbCon.closeAll();}}
Jar包下載 http://yunpan.cn/QC5IeekKJvixN 提取碼 243b
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