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1.JAVAÁ¬½ÓACCESSÊý¾Ý¿â
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ="+application.getRealPath("/Data/ReportDemo.mdb");
Connection conn = DriverManager.getConnection(url,"","");
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* sun.jdbc.odbc.JdbcOdbcDriver:Çý¶¯³ÌÐòÀàµÄÃû³Æ¡£
* /Data/ReportDemo.mdb:Êý¾Ý¿âÎļþ
* ÆäÖеÄÓû§ÃûºÍÃÜÂë¾ùΪ¿Õ
2.JAVAÁ¬½ÓMySQLÊý¾Ý¿â
Class.forName("org.gjt.mm.mysql.Driver");
String url="jdbc:mysql://localhost/myDB?user=soft&password=soft1234&userUnicode=true&characterEncoding=8859_1"
Connection conn = DriverManager.getConnection(url);
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* org.gjt.mm.mysql.Driver£ºÇý¶¯³ÌÐòÀàµÄÃû³Æ
* localhost£ºÊý¾Ý¿âµÄµØÖ·
* myDB£ºÊý¾Ý¿âµÄÃû³Æ
* soft£º·ÃÎÊÊý¾Ý¿âµÄÓû§Ãû
* soft1234£º·ÃÎÊÊý¾Ý¿âµÄÃÜÂë
* 8859_1£ºÊ¹ÓõÄ×Ö·û¼¯¡£
3.JAVAÁ¬½ÓSQL Server 7.0/2000Êý¾Ý¿â
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";
String user="sa";
String password="";
Connection conn = DriverManager.getConnection(url,user,password);
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* com.microsoft.jdbc.sqlserver.SQLServerDriver£ºÇý¶¯³ÌÐòÀàµÄÃû³Æ
* localhost£ºÊý¾Ý¿âµÄµØÖ·
* 1433£ºÊý¾Ý¿â·þÎñµÄ¶Ë¿Ú
* myDB£ºÊý¾Ý¿âµÄÃû³Æ
* user£º·ÃÎÊÊý¾Ý¿âµÄÓû§Ãû
* password£º·ÃÎÊÊý¾Ý¿âµÄÃÜÂë
4.JAVAÁ¬½ÓOracle 8/8i/9iÊý¾Ý¿â(thinģʽ)
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@192.168.0.1:1521:orcl";
String user="test";
String password="test";
Connection conn = DriverManager.getConnection(url,user,password);
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* oracle.jdbc.driver.OracleDriver£ºÇý¶¯³ÌÐòÀàµÄÃû³Æ
* jdbc:oracle:thin£ºÊ¹ÓÃthinģʽÁ¬½Ó
* 192.168.0.1£ºÊý¾Ý¿âµÄIPµØÖ·
* 1521£ºÊý¾Ý¿â·þÎñµÄ¶Ë¿Ú£¬ÕâÊÇOracleµÄĬÈÏÖµ
* orcl£ºÊý¾Ý¿âµÄSID
* user£º·ÃÎÊÊý¾Ý¿âµÄÓû§Ãû
* password


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Java SE ¶à̬

/*¶à̬ʾÀý*/
package demo;
class AA {
 public void f(){
  System.out.println("f in AA");
 }
}
class BB extends AA{
 public void f(){
  System.out.println("f in BB");
 }
 
}
public class Test_Dt {
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2. new String()ºÍnew String(“”)¶¼ÊÇÉêÃ÷Ò»¸öеĿÕ×Ö·û´®£¬Êǿմ®²»ÊÇnull£»
3. String str=”kvill”£»
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