2 初始化分配系统(其实里面没做什么)sqlite3MallocInit 3 初始化内建方法sqlite3RegisterBuiltinFunctions 4 初始化PCache系统sqlite3PcacheInitialize 5 初始化os子系统sqlite3OsInit,其中初始化了vfs子系统sqlite3_vfs_register 6 初始化了内存数据库sqlite3MemdbInit 7 PCache系统创建sqlite3PCacheBufferSetup 而他们...
Built-In Scalar SQL Functions (sqlite.org)
The LIKE optimization might occur if the column named on the left of the operator is indexed using the built-in BINARY collating sequence and case_sensitive_like is turned on. Or the optimization might occur if the column is indexed using the built-in NOCASE collating sequence and the case_...
SQLite implements SQL functions using callbacks to C-language routines. Even the built-in SQL functions are implemented this way. Most of the built-in SQL functions (ex:abs(),count(),substr(), and so forth) can be found infunc.csource file. Date and time conversion functions are found in...
–Management of the users defined functions, these functions are in continuation usable in the requests manual, as in the form of insertion/modification of data–Manual request and from file, it is possible of defined the format of the requests, sqlite or MySQL; a conversion is doing in ...
In the real world, you should prefer built-in functions to complex flow statements. Thezip()function would do a great job for this use case: 只需要 就能得到结果 与我们做的不同的是,zip(*data_matrix)得到的结果,内嵌的是tuple元组。不过不影响使用。
Add the ability forapplication-defined SQL functionsto have the same name as join keywords: CROSS,...
New Built-in Extension: sqlean (#3517,0561d3f,be10d1a) sqlean: All the Missing SQLite Functions This new built-in extension bring together several commonly known SQLite extensions neatly packaged into one domain module. Check out their repository for further information:https://www.github.com...
SQL (built-in) SQL scripting plugin is a very limited one. Its main purpose was to allow writing kind of procedures (since SQLite lacks procuders), using custom SQL functions. One would implement custom SQL function with SQL scripting plugin, put various SQL statements in the implementation an...
return the same result given the same inputs within a single SQL statement. Most SQL functions are deterministic. The built-in SQL function is an example of a function that is not deterministic. The SQLite query planner is able to perform additional optimizations on deterministic functions, so...