java链接jdbc

参考资料：http://www.cnblogs.com/hongten/archive/2011/03/29/1998311.html

public class jdbcDemo {

Connection con;
PreparedStatement pstmt;
String company;
public String DBHelper(String sql) {
try {
//加载数据库驱动
Class.forName(name);
//创建数据库链接
Connection con = (Connection) DriverManager.getConnection(url, user, password);
//创建一个实例，此处使用静态SQL
PreparedStatement pstmt = (PreparedStatement) con.prepareStatement(sql) ;
//执行SQL
ResultSet rs = pstmt.executeQuery(sql);
//拿到想要的查询结果
while (rs.next()){
company=rs.getString("company_id");
}
} catch (Exception e) {
e.printStackTrace();
}
return company;




}
//@AfterClass
public void close() {
try {
this.con.close();
this.pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
@Test
public void testDemo(){
String sql="select aa '";
System.out.println(DBHelper(sql));
}
}