如何使用来自<sql:query var=“result”>

Question

I have this code:

<sql:query var="result" 
sql="select column_name from information_schema.columns where table_name='userdb';"
/>

What does result store and how can I use it to retrieve my data?

Answer 1

The <sql:query> documentation explains what's inside the result variable:

The type of the scoped variable is javax.servlet.jsp.jstl.sql.Result

The javax.servlet.jsp.jstl.sql.Result is a sort of wrapper over a java.sql.ResultSet and has methods to get to the rows of data . It's then just a matter of <c:forEach> ing the rows. See here for an example.

PS Unless used for prototyping your application, using JSTL's SQL tags to access the database from within the JSP is discouraged.