Download MySQL 5.1 Plugin Development by Sergei Golubchik, Andrew Hutchings PDF

By Sergei Golubchik, Andrew Hutchings

This publication is written in a hands-on sort that actively consists of you whenever you learn via its chapters. In each bankruptcy you, besides the writer, can be enforcing a number of absolutely case in point plugins. the method is followed with an in depth step by step rationalization of the code, whilst giving you assets to create your individual plugins. while you are a MySQL program developer or a programmer who desires to interface with MySQL server, this ebook is for you. easy wisdom of C/C++, SQL, and MySQL particularly is thought within the ebook, yet no deep familiarity with any of the themes is needed.

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Dll into one of the Windows library paths: [ 30 ] Chapter 2 There are other common errors we can get when installing UDFs, but they are normally easier to diagnose: ERROR 1127 (HY000): Can't find symbol 'my_udf' in library This error shows that MySQL has loaded the library, but while searching it for the functions inside, it could not find what it was expecting. This is usually due to the wrong name for the UDF used in the CREATE FUNCTION command. ERROR 1044 (42000): Access denied for user 'username'@'localhost' to database 'mysql' When installing a UDF, MySQL needs to insert an entry into the func table of the mysql database because MySQL remembers all installed UDFs to be able to load them automatically when restarted.

H> These are the standard includes needed for this example. h contains the structures and constants that we will use. my_bool udf_staticexample_init(UDF_INIT *initid, UDF_ARGS *args, char *message) { We are calling this UDF udf_staticexample so all functions need to be prefixed with this. We start with the udf_staticexample_init() function, which as we have seen before, prepares the UDF for execution in the context of an SQL statement. long long *staticint = malloc(sizeof(long long)); if (staticint == NULL) { strcpy(message, "staticexample() allocation error"); return 1; } Here we declare a pointer to a type long long and allocate memory for it.

We could expect to see this error if the MySQL server crashes when installing or removing a UDF. To fix this, follow the usual MyISAM repair instructions as found in the MySQL manual. Defining UDFs All functions in the UDF API start with the name of the UDF itself. For example, if the UDF is called name (that is, installed with CREATE FUNCTION name and used like SELECT name()) the corresponding C functions may be called: name(), name_init(), name_deinit(), and so on. The following table lists all UDF API functions and their purpose: [ 31 ] User Defined Functions Function name_init() Normal / Aggregate Description Both Initialize the UDF for use.

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