rowid = RowIDField() title = SearchField() content = SearchField() class Meta: database = db # Use the porter stemming algorithm to tokenize content. options = {'tokenize': 'porter'} To store a document in the
The query planner is an AI that strives to select the best algorithm from these millions of choices. Bytecode Engine The bytecode program created by the code generator is run by a virtual machine. The virtual machine itself is entirely contained in a single source file vdbe.c. The vdbe....
CHECK(expr) conflict-clause::=ON CONFLICTconflict-algorithm CREATE TABLE语句基本上就是“CREATE TABLE”关键字后跟一个新的表名以及括号内的一堆定义和约束。表名可以是字符串或者标识符。以“sqlite_”开头的表名是留给数据库引擎使用的。 每个字段的定义是字段名后跟字段的数据类型,接着是一个或多个的字段约束。
6. 数据库配置命令: pragma cache_size; 修改缓存大小。默认-2000,2048000字节=2000K。 pragma cache_size = 1000; pragma default_cache_size; 永久改变某数据库缓存大小。默认-2000。 pragma default_cache_size = 1000; pragma cache_size = 1000; pragma database_list; 列出全部打开的数据库。 pragma tabl...
The algorithm used by memsys5 can be called "power-of-two, first-fit". The sizes of all memory allocation requests are rounded up to a power of two and the request is satisfied by the first free slot in pBuf that is large enough. Adjacent freed allocations are coalesced using a buddy ...
The algorithm used by memsys5 can be called "power-of-two, first-fit". The sizes of all memory allocation requests are rounded up to a power of two and the request is satisfied by the first free slot in pBuf that is large enough. Adjacent freed allocations are coalesced using a buddy ...
COPY[ORconflict-algorithm][database-name.]table-nameFROMfilename [USING DELIMITERSdelim] COPY命令在SQLite 2.8及更早的版本中可用。SQLite 3.0删除了这一命令,因为在混合的UTF-8/16环境中对它进行支持是很复杂的。在3.0版本中,命令行解释器 包含新的.import命令,用以替代COPY。
INSERT[ORconflict-algorithm]INTO[database-name.]table-name[(column-list)]select-statement INSERT语句有两种基本形式。一种带有"VALUES"关键字,在已有表中插入一个新的行。若不定义字段列表,那么值的数目将与表中的字段数目相同。否则值的数目须与字段列表中的字段数目相同。不在字段列表中的字段被赋予缺省值或...
assumptions about the result order. The reverse_unordered_selects pragma works for most SELECT statements, however the query planner may sometimes choose an algorithm that is not easily reversed, in which case the output will appear in the same order regardless of the reverse_unordered_selects ...
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