As we saw in the previous section, the server returns some important information about each query, displaying some of it directly in the MySQL client and making some of it easy to obtain through commands such as SHOW WARNINGS. When SQL is called from an application, it’s just as important to retrieve this information and check to make sure nothing suspicious is going on. All programming APIs for MySQL support functions that retrieve the query information returned by the server. In this section, we will discuss these functions. I refer just to the C API because I had to choose one language, and most of the other APIs are based on the C API.^[4]