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Shati Patel
2020-04-28 18:13:59 +01:00
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docs/language/ql-training/java/intro-ql-java.rst
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@@ -68,7 +68,7 @@ A simple CodeQL query
We are going to write a simple query which finds “if statements” with empty “then” blocks, so we can highlight the results like those on the previous slide. The query can be run in the `query console on LGTM <https://lgtm.com/query>`__, or in your `IDE <https://lgtm.com/help/lgtm/running-queries-ide>`__.
A `query <https://help.semmle.com/QL/ql-handbook/queries.html>`__ consists of a “select” clause that indicates what results should be returned. Typically it will also provide a “from” clause to declare some variables, and a “where” clause to state conditions over those variables. For more information on the structure of query files (including links to useful topics in the `QL language reference <https://help.semmle.com/QL/ql-handbook/index.html>`__), see `Introduction to query files <https://help.semmle.com/QL/learn-ql/ql/writing-queries/introduction-to-queries.html>`__.
A `query <https://help.semmle.com/QL/ql-handbook/queries.html>`__ consists of a “select” clause that indicates what results should be returned. Typically it will also provide a “from” clause to declare some variables, and a “where” clause to state conditions over those variables. For more information on the structure of query files (including links to useful topics in the `QL language reference <https://help.semmle.com/QL/ql-handbook/index.html>`__), see `About CodeQL queries <https://help.semmle.com/QL/learn-ql/ql/writing-queries/introduction-to-queries.html>`__.
In our example here, the first line of the query imports the `CodeQL library for Java <https://help.semmle.com/qldoc/java/>`__, which defines concepts like ``IfStmt`` and ``Block``.
The query proper starts by declaring two variables–ifStmt and block. These variables represent sets of values in the database, according to the type of each of the variables. For example, ``ifStmt`` has the type ``IfStmt``, which means it represents the set of all if statements in the program.