如何在servlet

Question

我需要帮助解决有关servlet中查询插入postgresql的问题，我有这样的查询

public void doInsert(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {  
String msisdn = "";
String prog_id = "";
String branch = "";

res.setContentType("text/html");  
String result = null; 
msisdn      =req.getParameter("msisdn");
prog_id     =req.getParameter("prog_id");  
branch      =req.getParameter("branch");  

try{  

Class.forName("org.postgresql.Driver");  
Connection con=DriverManager.getConnection(  
"jdbc:postgresql://localhost:5432/mydatabase","username","password");   

        ps=con.prepareStatement(
        "INSERT INTO reg_agent(msisdn, prog_id, branch) VALUES(?, ?, ?");   

        ps.setString(1, msisdn);
        ps.setString(2, prog_id);
        ps.setString(3, branch);
        int i=ps.executeUpdate(); 

   }

}
catch(Exception ex){
        System.out.println("record not found "+ex.getMessage());

}
} 

但是，查询无法在postgresql中插入我的数据库。

提前致谢

Answer 1

尝试记录请求参数，看看您是否在servlet中获取了所请求的值，

public void doInsert(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {  
String msisdn = "";
String prog_id = "";
String branch = "";

res.setContentType("text/html");  
String result = null; 
msisdn      =req.getParameter("msisdn");
prog_id     =req.getParameter("prog_id");  
branch      =req.getParameter("branch");  

System.out.println("MSISDN: "+msisdn);
System.out.println("PRGID: "+prog_id);
System.out.println("BRANCH: "+branch);   

try{  

Class.forName("org.postgresql.Driver");  
Connection con=DriverManager.getConnection(  
"jdbc:postgresql://localhost:5432/mydatabase","username","password");   

        ps=con.prepareStatement(
        "INSERT INTO reg_agent(msisdn, prog_id, branch) VALUES(?, ?, ?");   

        ps.setString(1, msisdn);
        ps.setString(2, prog_id);
        ps.setString(3, branch);
        int i=ps.executeUpdate(); 

   }

}
catch(Exception ex){
        System.out.println("record not found "+ex.getMessage());

}
}