SQLiteDatabase SQLiteDatabase 构造函数 字段 ConflictAbort ConflictFail ConflictIgnore ConflictNone ConflictReplace ConflictRollback JournalModeDelete JournalModeMemory JournalModeOff JournalModePersist JournalModeTruncate JournalModeWal MaxSqlCacheSize SqliteMaxLikePatter...
MAX(?,(SELECTseqFROMsqlite_sequence)+1) Code: importsqlite3,random,timedb=sqlite3.connect('test.db')db.execute("CREATE TABLE data(dt INTEGER PRIMARY KEY AUTOINCREMENT, label TEXT);")t=1600000000foriinrange(1000*1000):ifrandom.randint(0,100)==0:# timestamp increases of 1 second with pro...
4)为题3)的文件组FGROUP增加数据文件XSCJ1,XSCJ2,最大为10MB,自动增长,每次增10%。 alter database XSCJ add file( name='XSCJ1', filename='exitedPath\XSCJ1', maxsize=10MB, filegroup=10% )to filegroup FGROUP go --多条语句执行中间需要用go隔开 alter database XSCJ add file( name='XSCJ2', f...
MaxSqlCacheSize 可以设置的 #setMaxSqlCacheSize(int)绝对最大值。 SqliteMaxLikePatternLength SQLite 的默认 LIKE 和 GLOB 实现中使用的模式匹配算法可以表现出 O(N^2) 性能(其中 N 是模式中的字符数),某些病理情况。 SyncModeExtra 同步EXTRA 模式与同步模式类似 FULL ,添加包含回滚日志的目录在日志取消链...
CREATE DATABASE people ON PRIMARY ( NAME='people1', FILENAME='F:\数据库\练习\people1.mdf', SIZE=10MB, FILEGROWTH=10% ), ( NAME='people2', FILENAME='F:\数据库\练习\people2.ndf', SIZE=20MB, MAXSIZE=100MB, FILEGROWTH=1MB
startResrult* 起始条数* @param maxResult* 最大条数* @return*/public List<Person> getScrollData(int startResrult, int maxResult) {List<Person> persons = new ArrayList<Person>();SQLiteDatabase database = dbOpenHelper.getWritableDatabase();Cursor cursor = database.rawQuery("...
当然这样读取性能将会很差,因为读取查询将与单个数据库连接的写入查询竞争,但正如我们所看到的, WAL在日志模式下,即使ddatabase被锁定以进行写入,SQLite也允许无限读取。诀窍是设置2个数据库连接池:一个用于写入的池 SetMaxOpenConns(1)1个读取池,其根据CPU数量进行扩展。writeDB, err := sql.Open("sqlite...
For a page size = 4KB (which is the default for sqlite for some years now) following are the limits: Max sqlite db file size (KB) = pow(2,32) * 4 = 17179869184 KB or 16TB 16TB is logical size i.e. file size reported by stat like call in any version. Since there could be ...
SQLITE_MAX_MMAP_SIZE=0 SQLITE_MAX_LENGTH=2147483647 SQLITE_MAX_COLUMN=32767 SQLITE_MAX_SQL_LENGTH=1073741824 SQLITE_MAX_FUNCTION_ARG=127 SQLITE_MAX_ATTACHED=125 SQLITE_MAX_PAGE_COUNT=4294967294 SQLITE_DQS=0 CODEC_TYPE=CODEC_TYPE_CHACHA20 SQLITE_ENABLE_EXTFUNC=1 SQLITE_ENABLE_REGEXP=1 SQLITE_TE...
max_page_count Pragma max_page_countPragma 为数据库获取或设置允许的最大页数。语法如下: PRAGMA[database.]max_page_count;PRAGMA[database.]max_page_count=max_page; 默认值是 1,073,741,823,这是一个千兆的页面,即如果默认 1 KB 的页面大小,那么数据库中增长起来的一个兆字节。