如何判斷數據庫中是否存在一個數據表

方法是通過查詢數據庫meta數據來獲取數據表。

public static Boolean doesTableExist(String tablename) { Connection con = null; HashSet<String> set = new HashSet<String>(); try { Class.forName(DatabaseConnection.getDatabaseConnection()); con = DriverManager.getConnection(DatabaseName.con); DatabaseMetaData meta = con.getMetaData(); ResultSet res = meta.getTables(null, null, null, new String[]{"TABLE"}); while (res.next()) { set.add(res.getString("TABLE_NAME")); } res.close(); con.close(); } catch (Exception e) { System.err.println("Exception: " + e.getMessage()); } //System.out.println(set); return set.contains(tablename.toUpperCase()); }

 

其中只需要替換DatabaseConnection.getDatabaseConnection() 和DatabaseName.con 爲你需要連接的數據庫就好了。可以參考另一篇文章如何連接埠通的數據庫：http://blog.csdn.net/autofei/archive/2010/05/24/5621274.aspx

 

另外一個方法就是嘗試連接數據庫，然後捕獲異常。

//connection = new DatabaseConnection(DatabaseConnection.DERBY, "", "db", "uncc", "uncc"); connection = new DatabaseConnection(DatabaseConnection.POSTGRES, "localhost", "postgres", "postgres", "postgres"); database = new Database(connection); // Checks to see if database structure already exists boolean exists = true; Statement stmt = connection.getStatement(); try { stmt.executeQuery("SELECT * FROM qgram"); } catch (Exception e) { connection.rollback(); exists = false; } 

 

參考：http://www.herongyang.com/jdbc/JDBC-ODBC-Flat-File-List-Tables.html