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Shati Patel
2020-04-28 18:13:59 +01:00
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docs/language/ql-training/cpp/intro-ql-cpp.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 C/C++ <https://help.semmle.com/qldoc/cpp/>`__, 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.