1. Overview SQLite 能够在运行时加载扩展(包括新的application-defined SQL functions、collating sequences、virtual tables和VFSes)。此功能允许扩展代码与应用程序分开开发和测试,然后根据需要加载。 扩展也可以与应用程序静态链接。下面显示的代码模板将与静态链接扩展一样工作,就像它作为运行时可加载扩展一样,除了您应...
从这里Create Or Redefine SQL Functions可以看出: The first parameter is thedatabase connectionto which the SQL function is to be added. If an application uses more than one database connection then application-defined SQL functions must be added to each database connection separately. 需要为每个数...
Built-in functions may be overloaded by new application-defined functions. An application-defined function is permitted to call other SQLite interfaces. However, such calls must not close the database connection nor finalize or reset the prepared statement in which the function is running....
SQLite does not currently generate this result code. However,application-defined SQL functionsorvirtual tables, orVFSes, or other extensions might cause this result code to be returned. (3) SQLITE_PERM The SQLITE_PERM result code indicates that the requested access mode for a newly created data...
純量函式會針對查詢中的每個資料列傳回單一純量值。 使用 CreateFunction 定義新的純量函式,並覆寫內建函式。如需func 引數的支援參數和傳回型別清單,請參閱資料類型。指定state 引數會將該值傳遞至函式的每個叫用。 使用此選項來避免關閉。指定isDeterministic 函式是否具決定性,以允許 SQLite 在編譯查詢時...
Multi-threading support is low-priority and untested. If your application-defined functions and virtual tables don't reference data outside of the database they are attached to, this will not cause issues because SQLite always does database operations in a single thread. However, the API needs...
** argument of the application-defined function. ^Subsequent ** ^The sqlite3_set_auxdata(C,N,P,X) interface saves P as auxiliary data for the ** N-th argument of the application-defined function. ^Subsequent ** calls to sqlite3_get_auxdata(C,N) return P from the most recent ** ...
Learn 登录 版本 .NET for Android API 34 Insert InsertOrThrow InsertWithOnConflict InTransaction MarkTableSyncable NeedUpgrade OnAllReferencesReleased OpenDatabase OpenOrCreateDatabase 查询 QueryWithFactory RawQuery RawQueryWithFactory ReleaseMemory Replace ...
** implementation of an application-defined [sqlite3_os_init()]. ** ** The first argument to sqlite3_config() is an integer ** [SQLITE_CONFIG_SINGLETHREAD | configuration option] that determines ** what property of SQLite is to be configured. Subsequent arguments ** vary depending...
4.12. The json_group_array() and json_group_object() aggregate SQL functions 4.13. The json_each() and json_tree() table-valued functions 4.13.1. Examples using json_each() and json_tree() Thejson1extension is a loadable extension that implements fifteen application-defined SQL functions an...