import java.sql.*;
/**
 * <p>Title: 數(shù)據(jù)庫元數(shù)據(jù)</p>
 * <p>Description: 使用數(shù)據(jù)庫元數(shù)據(jù)對象獲取數(shù)據(jù)庫信息。</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Filename: JDBCDataMeta.java</p>
 * @version 1.0
 */
public class JDBCDataMeta {
 PRivate String url="";
 private String username="";
 private String passWord="";
/**
 *<br>方法說明：主方法
 *<br>輸入?yún)?shù)：
 *<br>返回類型：
 */
 public static void main(java.lang.String[] args) {
    if(args.length!=4){
      System.out.println("use: java JDBCDataMeta url username password tablename");
      return;
    }
    JDBCDataMeta JDM = new JDBCDataMeta();
    JDM.url = args[0];
    JDM.username=args[1];
    JDM.password=args[2];
    JDM.getMeta(JDM.conn(),args[3]);
}

/**
 *<br>方法說明：獲得數(shù)據(jù)連接
 *<br>輸入?yún)?shù)：
 *<br>返回類型：Connection 連接對象
 */ 
  public Connection conn(){
     try {
        Class.forName("Oracle.jdbc.driver.OracleDriver");
        Connection con = DriverManager.getConnection(url, username, password);
        return con;
    }catch(ClassNotFoundException cf){
     System.out.println("can´t find class"+cf);
     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;
    }
  }
/**
 *<br>方法說明：獲取數(shù)據(jù)元數(shù)據(jù)信息
 *<br>輸入?yún)?shù)：Connection con 數(shù)據(jù)庫連接
 *<br>輸入?yún)?shù)：String table 表名稱
 *<br>返回類型：
 */
  public void getMeta(Connection con, String table){
   try {
     DatabaseMetaData dbmd = con.getMetaData();
     //獲取驅動名
     String dataName = dbmd.getDriverName();
     String dataURL = dbmd.getURL();
     System.out.println("**************** DATA META Comment  *********************");
     System.out.println("dataName="+dataName);
     System.out.println("dataURL="+dataURL);
     //獲取數(shù)據(jù)庫最大支持字節(jié)數(shù)
     int dataMaxSize = dbmd.getMaxRowSize();
     System.out.println("dataMaxSize="+dataMaxSize);
     //獲取數(shù)據(jù)庫表信息
     String[] types = new String[1];
     types[0] = "TABLE";
     ResultSet results = dbmd.getTables(null, null, "%", types);
     System.out.println("********************tables information********************");
     while (results.next())
     {
        System.err.println("----------------------------");
        System.err.println("TABLE_CAT   : "+results.getObject(1));
        System.err.println("TABLE_SCHEM : "+results.getObject(2));
        System.err.println("TABLE_NAME  : "+results.getObject(3));
        System.err.println("TABLE_TYPE  : "+results.getObject(4));
        System.err.println("REMARKS     : "+results.getObject(5));
    }
     //獲取表主鍵信息
     ResultSet pkRSet = dbmd.getPrimaryKeys(null, null, table);
     System.out.println("********************PK information********************");
      while(pkRSet.next()){
        System.err.println("TABLE_CAT : "+pkRSet.getObject(1));
        System.err.println("TABLE_SCHEM: "+pkRSet.getObject(2));
        System.err.println("TABLE_NAME : "+pkRSet.getObject(3));
        System.err.println("COLUMN_NAME: "+pkRSet.getObject(4));
        System.err.println("KEY_SEQ : "+pkRSet.getObject(5));
        System.err.println("PK_NAME : "+pkRSet.getObject(6));
     }