Bridge table in SQL
I have 2 tables: professors(professorid INT PK, name VARCHAR), courses(courseid INT PK, title). I also have a bridge table: professorscourses(profid INT FK, course_id INT FK).
I still didn't find a query for something like this: given the professor name, "x"
Using the bridge table, find all the courses for professor X.
professors prof_id | name 1 John
professors_courses profid | courseid 1 2 1 3 1 5 2 1
courses course_id | title 1 English 2 French 3 Italian 4 Japanese 5 Polish
Given the name "John", seems he has the following courses: French,Italian,Polish
View Answers
July 27, 2012 at 11:07 AM
Here is a jsp code of dependent dropdown. The given code retrieves the professor names from the database and stored into dropdown. When the user selects any name professor, his/her courses is then displayed in another dropdown box on the same page. We have used Ajax for this.
1)professor.jsp:
<%@page import="java.sql.*"%>
<html>
<head>
<script language="javascript" type="text/javascript">
var xmlHttp
var xmlHttp
function showState(str){
if (typeof XMLHttpRequest != "undefined"){
xmlHttp= new XMLHttpRequest();
}
else if (window.ActiveXObject){
xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
}
if (xmlHttp==null){
alert("Browser does not support XMLHTTP Request")
return;
}
var url="course.jsp";
url +="?count=" +str;
xmlHttp.onreadystatechange = stateChange;
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
}
function stateChange(){
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
document.getElementById("course").innerHTML=xmlHttp.responseText
}
}
</script>
</head>
<body>
<select name='professor' onchange="showState(this.value)">
<option value="none">Select</option>
<%
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("Select * from professors");
while(rs.next()){
%>
<option value="<%=rs.getString(1)%>"><%=rs.getString(2)%></option>
<%
}
%>
</select>
<br>
<div id='course'>
<select name='course' >
<option value='-1'></option>
</select>
</div>
</body>
</html>
2)course.jsp:
<%@page import="java.sql.*"%>
<%
String profid=request.getParameter("count");
String buffer="<select name='course' ><option value='-1'>Select</option>";
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("Select * from courses where prof_id='"+profid+"' ");
while(rs.next()){
buffer=buffer+"<option value='"+rs.getString(1)+"'>"+rs.getString(3)+"</option>";
}
buffer=buffer+"</select>";
response.getWriter().println(buffer);
}
catch(Exception e){
System.out.println(e);
}
%>
For the above code, we have created two database tables:
CREATE TABLE `professors` (
`prof_id` bigint(255) NOT NULL auto_increment,
`name` varchar(255) default NULL,
PRIMARY KEY (`prof_id`));
CREATE TABLE `courses` (
`courseid` bigint(255) NOT NULL auto_increment,
`prof_id` int(255) default NULL,
`title` varchar(255) default NULL,
PRIMARY KEY (`stateid`));
July 28, 2012 at 7:14 PM
Thank you for your time:) But well I found how now.
String sqlQuery = "SELECT courses.title FROM courses INNER JOIN professors_courses ON professors_courses.course_id = course.course_id WHERE prof_id = '"+x+"'";
I forgot to take into account that user chooses a professor name, I look for he's ID and then I use this Query.
July 28, 2012 at 7:14 PM
Thank you for your time:) But well I found how now.
String sqlQuery = "SELECT courses.title FROM courses INNER JOIN professors_courses ON professors_courses.course_id = course.course_id WHERE prof_id = '"+x+"'";
I forgot to take into account that user chooses a professor name, I look for he's ID and then I use this Query.
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