How to select data from two different databases and display in table format

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I am trying to display data from two different database,
database1:cover > Table:firmlist
database2:userdata >Table:admin

How to get database connectivity for two different database?

What I have tried:

<%
try {


Class.forName("com.mysql.jdbc.Driver").newInstance();

Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/cover", "root", "");

Statement statement = connection.createStatement();

String QueryString = "SELECT (FirmName)FROM cover.dbo.table firmlist UNION SELECT (UserShortName,UserPW) from userdata.dbo.table admin WHERE FirmId=UserId ";;
ResultSet rs = statement.executeQuery(QueryString);
%>


<TABLE id="myTable" cellpadding="15" style="background-color: #b9d9e8;">
<TR>

<TH>Company Name</TH>
<TH>User Name</TH>
<TH>Password</TH>
</TR>
<%
while (rs.next()) {
%>

<TR>
<TD><%=rs.getString(2)%></TD>
<TD><%=rs.getString(3)%></TD>
<TD><%=rs.getString(4)%></TD>
</TR>
<% } %>
<%

rs.close();
statement.close();
connection.close();
} catch (Exception ex) {
%>


<%
out.println(ex);
}
%>
</TABLE>

Posted 28-Mar-18 18:43pm

Member 13752376

Updated 29-Mar-18 7:30am

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Richard Deeming · Answer 1 · 2018-03-29T07:31:00

First problem:
You're trying to UNION two sets with a different number of columns. You can only UNION sets with the same number of columns:
MySQL :: MySQL 5.7 Reference Manual :: 13.2.9.3 UNION Syntax[^]

I suspect you want to JOIN the tables instead:
MySQL :: MySQL 5.7 Reference Manual :: 13.2.9.2 JOIN Syntax[^]

Second problem:
You're specifying a three-part name for the tables - cover.dbo.table and userdata.dbo.table. That's MS SQL Server syntax, not MySQL syntax.

SQL

SELECT FirmName, UserShornName, UserPW FROM cover.table As firmlist JOIN userdata.table As admin ON admin.UserId = firmlist.FirmId

Third problem:
You appear to be storing passwords in plain text. Don't do that.
Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]