jdbc訪問(wèn)數(shù)據(jù)庫(kù)
1 將數(shù)據(jù)庫(kù)的JDBC驅(qū)動(dòng)加載到classpath中，在基于JAVAEE的WEB應(yīng)用實(shí)際開(kāi)發(fā)過(guò)程中，通常要把目標(biāo)數(shù)據(jù)庫(kù)產(chǎn)品的JDBC驅(qū)動(dòng)復(fù)制到WEB-INF/lib下.
2 加載JDBC驅(qū)動(dòng)，并將其注冊(cè)到DriverManager中；
3 建立數(shù)據(jù)庫(kù)連接，取得Connection對(duì)象.例如:
MySQL：
String Driver="com.mysql.jdbc.Driver"; //驅(qū)動(dòng)程序
String URL="jdbc:mysql://localhost:3306/db_name"; //連接的URL,db_name為數(shù)據(jù)庫(kù)名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).new Instance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Microsoft SQL Server驅(qū)動(dòng)(msbase.jar、mssqlserver.jar、msutil.jar):
String Driver="com.microsoft.jdbc.sqlserver.SQLServerDriver"; //連接SQL數(shù)據(jù)庫(kù)的方法
String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name"; //db_name為數(shù)據(jù)庫(kù)名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).new Instance(); //加載數(shù)據(jù)驅(qū)動(dòng)
Connection con=DriverManager.getConnection(URL,UserName,Password);
Microsoft SQL Server驅(qū)動(dòng)(jtds-1.2.jar):
String Driver="net.sourceforge.jtds.jdbc.Driver"; //連接SQL數(shù)據(jù)庫(kù)的方法
String URL="jdbc:jtds:sqlserver://localhost:1433/db_name;s=8.0;lastupdatecount=true"; //db_name為數(shù)據(jù)庫(kù)名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).new Instance(); //加載數(shù)據(jù)驅(qū)動(dòng)
Connection con=DriverManager.getConnection(URL,UserName,Password);
Sysbase:
String Driver="com.sybase.jdbc.SybDriver"; //驅(qū)動(dòng)程序
String URL="jdbc:Sysbase://localhost:5007/db_name"; //db_name為數(shù)據(jù)可名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Sysbase:
String url="jdbc:sybase:Tds:localhost:5007/tsdata";
Properties sysProps=System.getProperties();
SysProps.put("user","userid");
SysProps.put("password","user_password");
Connection conn=DriverManager.getConnection(url,SysProps);
Oracle(用thin模式):
String Driver="oracle.jdbc.driver.OracleDriver"; //連接數(shù)據(jù)庫(kù)的方法
String URL="jdbc:oracle:thin:@loaclhost:1521:orcl"; //orcl為數(shù)據(jù)庫(kù)的SID
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance(); //加載數(shù)據(jù)庫(kù)驅(qū)動(dòng)
Connection con=DriverManager.getConnection(URL,Username,Password);
PostgreSQL:
String Driver="org.postgresql.Driver"; //連接數(shù)據(jù)庫(kù)的方法
String URL="jdbc:postgresql://localhost/db_name"; //db_name為數(shù)據(jù)可名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
DB2：
String Driver="com.ibm.db2.jdbc.app.DB2.Driver"; //連接具有DB2客戶端的Provider實(shí)例
//String Driver="com.ibm.db2.jdbc.net.DB2.Driver"; //連接不具有DB2客戶端的Provider實(shí)例
String URL="jdbc:db2://localhost:5000/db_name"; //db_name為數(shù)據(jù)可名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Informix:
String Driver="com.informix.jdbc.IfxDriver";
String URL="jdbc:Informix-sqli://localhost:1533/db_name:INFORMIXSER=myserver"; //db_name為數(shù)據(jù)可名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
JDBC-ODBC:
String Driver="sun.jdbc.odbc.JdbcOdbcDriver";
String URL="jdbc:odbc:dbsource"; //dbsource為數(shù)據(jù)源名
String Username="username"; //用戶名
String Password="password"; //密碼
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
4 建立Statement對(duì)象或PreparedStatement對(duì)象.例如：
//建立Statement對(duì)象
Statement stmt=conn.createStatement();
//建立ProparedStatement對(duì)象
String sql="select * from user where userName=? and password=?";
PreparedStatement pstmt=Conn.prepareStatement(sql);
pstmt.setString(1,"admin");
pstmt.setString(2,"liubin");
5 執(zhí)行SQL語(yǔ)句.例如：
String sql="select * from users";
ResultSet rs=stmt.executeQuery(sql);
//執(zhí)行動(dòng)態(tài)SQL查詢
ResultSet rs=pstmt.executeQuery();
//執(zhí)行insert update delete等語(yǔ)句，先定義sql
stmt.executeUpdate(sql);
6 訪問(wèn)結(jié)果記錄集ResultSet對(duì)象。例如：
while(rs.next)
{
out.println("你的第一個(gè)字段內(nèi)容為："+rs.getString());
out.println("你的第二個(gè)字段內(nèi)容為："+rs.getString(2));
}
7 依次將ResultSet、Statement、PreparedStatement、Connection對(duì)象關(guān)閉，釋放所占用的資源.例如:
rs.close();
stmt.clost();
pstmt.close();
con.close();