在播放框架中使用数据库中的值填充下拉列表 [英] Populating Drop down with the values from database in play frame work
问题描述
我是框架工作的新手，我发现这有点困难.我正在从数据库中检索客户端名称列表并将其填充到下拉列表中，这是我的 client.java 代码
I am new to play frame work and i am finding it bit difficult. i am retrieving list of client names from data base and populating it to a dropdown ,here is my client.java code
package models;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.*;
import play.db.ebean.Model;
public class Client extends Model {
/**
*
*/
private static final long serialVersionUID = -1932214701504374792L;
public static String ClientName;
public static ArrayList<String> Clientdetail= new ArrayList<>();
public static ArrayList<String> PopulateClient() {
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433","SUMEET","sumeet");
Statement sta = conn.createStatement();
String Sql = "select * from client";
ResultSet rs = sta.executeQuery(Sql);
while (rs.next()) {
ClientName = rs.getString("ClientName");
Clientdetail.add(ClientName);
}
} catch (InstantiationException | IllegalAccessException
| ClassNotFoundException |SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return(Clientdetail);
}
}
这是我的 application.java 代码
Here is My application.java code
package controllers;
import models.Client;
import play.mvc.*;
import views.html.*;
public class Application extends Controller {
public static Result index(){
return ok(index.render(Client.PopulateClient()));
}
}
这是我的 index.scala.html
and here is my index.scala.html
@(ClientDetails: java.util.ArrayList[String])
@main("ADMS") {
<center>
<form id="select">
<a>CONSULTANT</a>
<select name=Consultant>
<option value="lokesh">Lokesh</option>
<option>@ClientDetails</option>
<option>Vidyasekar</option>
<option>Abhishek</option>
<option>Naveen</option>
<option>Nanda</option>
</select>
<table border="1">
<tr>
<td width=50px>Client</td>
<td width=50px>Project</td>
<td width=50px>Task</td>
<td width=50px>Date</td>
<td width=50px>Consultant</td>
<td width=50px>Role</td>
<td width=80px>Is Billable</td>
</tr>
<tr>
<td>@ClientDetails</td>
</tr>
</table>
</form>
</center>
}
main.scala.html
main.scala.html
@(title: String)(Content: Html)
<!DOCTYPE html>
<html>
<head>
<title>@title</title>
</head>
<body>
@Content
</body>
</html>
有人可以帮我解决这个问题吗?我需要用数组值填充下拉列表，填充的数据只是括号 --> "[]"
Can some one help me with this? i need to populate the dropdown with the array value and the data that is getting populated is just brackets --> "[]"
推荐答案
Play 框架提供了模板助手库，该库提供了使用选项和选定值构建选择下拉列表的功能.正确理解后使用起来非常简单.
Play framework provides template helper library which gives functionality to build select dropdown with options and selected value. It's pretty simple to use once understood properly.
@helper.select() 方法采用与选择类型的输入字段相关的各种参数.第一个参数是表单字段，因为这里我们没有任何表单，我们可以创建一个临时表单并在其中创建一个名为 Consultant 的新字段[因为这将是选择字段的 name 属性的值].第二个参数是选项的映射，其中键和值分别对应选项标签的值和包含在选项标签中的文本.
@helper.select() method in view takes various parameters related to a input field of select type. 1st parameter is form field, since here we don't have any form we can create a temporary form and create a new field inside with name Consultant[as this will the value of name attribute of select field]. 2nd parameter will be map of options in which key and value, corresponds to value of option tag and text enclosed in option tag respectively.
控制器代码
package controllers;
import models.Client;
import play.mvc.*;
import views.html.*;
public class Application extends Controller {
public static Result index(){
return ok(index.render(Client.getClientDetails()));
}
}
型号代码
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.*;
import play.db.ebean.Model;
public class Client extends Model {
/**
*
*/
private static final long serialVersionUID = -1932214701504374792L;
public static String ClientName;
public static HashMap<String, String> Clientdetail= new HashMap<String, String>();
public static HashMap<String, String> getClientDetails() {
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433","SUMEET","sumeet");
Statement sta = conn.createStatement();
String Sql = "select * from client";
ResultSet rs = sta.executeQuery(Sql);
while (rs.next()) {
ClientName = rs.getString("ClientName");
Clientdetail.put(ClientName,ClientName);
}
} catch (InstantiationException | IllegalAccessException
| ClassNotFoundException |SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return(Clientdetail);
}
}
查看代码:index.scala.html
View Code : index.scala.html
@(ClientDetails: java.util.HashMap[String, String])
@import helper._
@main("ADMS") {
<center>
<form id="select">
<a>CONSULTANT</a>
@select(Form.form()("Consultant"),
options(ClientDetails),
'value -> "clientName1"[any value that should be selected by default])
<table border="1">
<tr>
<td width=50px>Client</td>
<td width=50px>Project</td>
<td width=50px>Task</td>
<td width=50px>Date</td>
<td width=50px>Consultant</td>
<td width=50px>Role</td>
<td width=80px>Is Billable</td>
</tr>
<tr>
<td>@ClientDetails</td>
</tr>
</table>
</form>
</center>
}
这篇关于在播放框架中使用数据库中的值填充下拉列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
