Download Models and languages of object-oriented databases by Lausen G., Vossen G. PDF

By Lausen G., Vossen G.

Brings jointly key advancements in OO databases from components equivalent to semantic modelling, formal info versions, language layout concerns, item algebra and rule-based question languages. indicates how those parts might engage inside an object-oriented database approach. Paper. DLC: Object-oriented database.

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Extra resources for Models and languages of object-oriented databases

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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.

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