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add support for defining an "eponymous only" virtual table (#885)

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* add support for defining an "eponymous only" virtual table

As suggested here: https://github.com/mattn/go-sqlite3/issues/846#issuecomment-736206222

* add an example of an eponymous only vtab module

* add a test case for an eponymous only vtab module
This commit is contained in:
Patrick DeVivo
2020-12-26 09:11:17 -05:00
committed by GitHub
parent 66ff625f34
commit 92d23714a8
4 changed files with 325 additions and 3 deletions
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55
sqlite3_opt_vtable.go
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@@ -226,11 +226,43 @@ static sqlite3_module goModule = {
0 // xRollbackTo
};
// See https://sqlite.org/vtab.html#eponymous_only_virtual_tables
static sqlite3_module goModuleEponymousOnly = {
0, // iVersion
0, // xCreate - create a table, which here is null
cXConnect, // xConnect - connect to an existing table
cXBestIndex, // xBestIndex - Determine search strategy
cXDisconnect, // xDisconnect - Disconnect from a table
cXDestroy, // xDestroy - Drop a table
cXOpen, // xOpen - open a cursor
cXClose, // xClose - close a cursor
cXFilter, // xFilter - configure scan constraints
cXNext, // xNext - advance a cursor
cXEof, // xEof
cXColumn, // xColumn - read data
cXRowid, // xRowid - read data
cXUpdate, // xUpdate - write data
// Not implemented
0, // xBegin - begin transaction
0, // xSync - sync transaction
0, // xCommit - commit transaction
0, // xRollback - rollback transaction
0, // xFindFunction - function overloading
0, // xRename - rename the table
0, // xSavepoint
0, // xRelease
0 // xRollbackTo
};
void goMDestroy(void*);
static int _sqlite3_create_module(sqlite3 *db, const char *zName, uintptr_t pClientData) {
return sqlite3_create_module_v2(db, zName, &goModule, (void*) pClientData, goMDestroy);
}
static int _sqlite3_create_module_eponymous_only(sqlite3 *db, const char *zName, uintptr_t pClientData) {
return sqlite3_create_module_v2(db, zName, &goModuleEponymousOnly, (void*) pClientData, goMDestroy);
}
*/
import "C"
@@ -595,6 +627,13 @@ type Module interface {
DestroyModule()
}
// EponymousOnlyModule is a "virtual table module" (as above), but
// for defining "eponymous only" virtual tables See: https://sqlite.org/vtab.html#eponymous_only_virtual_tables
type EponymousOnlyModule interface {
Module
EponymousOnlyModule()
}
// VTab describes a particular instance of the virtual table.
// See: http://sqlite.org/c3ref/vtab.html
type VTab interface {
@@ -652,9 +691,19 @@ func (c *SQLiteConn) CreateModule(moduleName string, module Module) error {
mname := C.CString(moduleName)
defer C.free(unsafe.Pointer(mname))
udm := sqliteModule{c, moduleName, module}
rv := C._sqlite3_create_module(c.db, mname, C.uintptr_t(uintptr(newHandle(c, &udm))))
if rv != C.SQLITE_OK {
return c.lastError()
switch module.(type) {
case EponymousOnlyModule:
rv := C._sqlite3_create_module_eponymous_only(c.db, mname, C.uintptr_t(uintptr(newHandle(c, &udm))))
if rv != C.SQLITE_OK {
return c.lastError()
}
return nil
case Module:
rv := C._sqlite3_create_module(c.db, mname, C.uintptr_t(uintptr(newHandle(c, &udm))))
if rv != C.SQLITE_OK {
return c.lastError()
}
return nil
}
return nil
}