Question

我正在尝试连接到数据库，并使用JSP在数据库中只插入一个值。我创建了表category，其中包含Category_id和Category_name两列，其中Category_id是自动增量。所以我想只在表格中插入类别名称。问题是，我无法插入。以下是我写的代码：

String cname = request.getParameter("cname");
try{
         // Register JDBC driver
         Class.forName("com.mysql.jdbc.Driver");

         // Open a connection
         Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/infoshare", "root", "");

         // Execute SQL query
         Statement stmt = conn.createStatement();

         String sql;
         sql = "INSERT INTO catagory(Catagory_name) VALUES("+cname+")";

          //ResultSet rs = stmt.executeQuery(sql);
         //out.print(cname);

         stmt.executeUpdate(sql);
         out.print("<h1>Hello</h1>");

         // Clean-up environment
         //rs.close();
         stmt.close();
         conn.close();
      }catch(SQLException se){
         //Handle errors for JDBC
         se.printStackTrace();
      }catch(Exception e){
         //Handle errors for Class.forName
         e.printStackTrace();
      }

Answer 1

尝试几次之后，得到的答案如下：

 String cname = request.getParameter("cname");
 String cstatus = request.getParameter("cstatus");
try{
         // Register JDBC driver
         Class.forName("com.mysql.jdbc.Driver");

         // Open a connection
         Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/infoshare", "root", "");

         // Execute SQL query
         Statement stmt = conn.createStatement();
         //
        String sql;
        sql = "INSERT INTO category(Category_name,status) values('"+cname+"','"+cstatus+"')";
        stmt.executeUpdate(sql);

        // ResultSet rs = stmt.executeQuery(sql);
         response.sendRedirect("add_category.jsp");         

         // Clean-up environment
        //rs.close();
         stmt.close();
         conn.close();
      }catch(SQLException se){
         //Handle errors for JDBC
         se.printStackTrace();
      }catch(Exception e){
         //Handle errors for Class.forName
         e.printStackTrace();
      }
  }

JSP数据库连接和数据插入

1 个答案: