1． 连接ACCESS（ AccessBean.java）
package access;
import java.sql.*;
public class AccessBean
{
String driver="sun.jdbc.odbc.JdbcOdbcDriver";
Connection connect=null;
ResultSet rs=null;
public AccessBean(){
try{
Class.forName(driver);
}catch(Exception e){
e.printStackTrace();
}
}
public ResultSet query(String sql){
try{
connect=DriverManager.getConnection("jdbc:odbc:student","","");
Statement stmt=connect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs=stmt.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
public void update(String sql){
try{
connect=DriverManager.getConnection("jdbc:odbc:vote","","");
Statement stmt=connect.createStatement();
stmt.executeUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}
}
};
2． 连接SQLSERVER（SqlServerBean.java）
package sql;
import java.sql.*;
public class SqlServerBean
{
String driver="com.microsoft.jdbc.sqlserver.SQLServerDriver";
Connection connect=null;
ResultSet rs=null;
public SqlServerBean(){
try{
Class.forName(driver);
}catch(Exception e){
e.printStackTrace();
}
}
public ResultSet query(String sql){
try{
connect=DriverManager.getConnection("jdbc:microsoft:sqlserver://ts06:1433;Database Name=mydata","sa","sa");
Statement stmt=connect.createStatement();
rs=stmt.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
public void update(String sql){
try{
connect=DriverManager.getConnection("jdbc:microsoft:sqlserver://ts06:1433;DatabaseName=mydata","sa","sa");
Statement stmt=connect.createStatement();
stmt.executeUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}
}
};
3． 连接ORACLE
package oracle;
import java.sql.*;
public class OracleBean
{
String serverName=”localhost”;
String driver="oracle.jdbc.driver.OracleDriver";
String url=”jdbc:oracle:thin:@”+serverName+”:1521:OEMREP”;
Connection connect=null;
ResultSet rs=null;
public OracleBean(){
try{
Class.forName(driver);
}catch(Exception e){
e.printStackTrace();
}
}
public ResultSet query(String sql){
try{
connect=DriverManager.getConnection(url,”system”,”manager”);
Statement stmt=connect.createStatement();
rs=stmt.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
public void update(String sql){
try{
connect=DriverManager.getConnection(url,”system”,”manager”);
Statement stmt=connect.createStatement();
stmt.executeUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}
}
};
Statement stmt=connect.createStatement()括号内可以加参数：
ResultSet.TYPE_SCROLL_INSENSITIVE表示结果集可以滚动，但对数据库变化不敏感
ResultSet.CONCUR_READ_ONLY表示结果集不能用于更新数据库
ResultSet.TYPE_FORWARD_ONLY结果集不滚动
ResultSet.TYPE_SCROLL_SENSITIVE结果集可以滚动，而且对数据库变化不敏感
ResultSet.CONCUR_UPDATE可用于更新数据库