/*
* Drop a collection from the KV storage engine and the underlying
* unqlite VM.
*/
UNQLITE_PRIVATE int unqliteDropCollection(unqlite_col *pCol)
{
unqlite_vm *pVm = pCol->pVm;
jx9_int64 nId;
int rc;
/* Reset the cursor */
unqlite_kv_cursor_reset(pCol->pCursor);
/* Seek the cursor to the desired location */
rc = unqlite_kv_cursor_seek(pCol->pCursor,
SyStringData(&pCol->sName),SyStringLength(&pCol->sName),
UNQLITE_CURSOR_MATCH_EXACT
);
if( rc == UNQLITE_OK ){
/* Remove the record from the storage engine */
rc = unqlite_kv_cursor_delete_entry(pCol->pCursor);
}
if( rc != UNQLITE_OK ){
unqliteGenErrorFormat(pCol->pVm->pDb,
"Cannot remove collection '%z' due to a read-only Key/Value storage engine",
&pCol->sName
);
return rc;
}
/* Drop collection records */
for( nId = 0 ; nId < pCol->nLastid ; ++nId ){
unqliteCollectionDropRecord(pCol,nId,0,0);
}
/* Cleanup */
CollectionCacheRelease(pCol);
SyBlobRelease(&pCol->sHeader);
SyBlobRelease(&pCol->sWorker);
SyMemBackendFree(&pVm->sAlloc,(void *)SyStringData(&pCol->sName));
unqliteReleaseCursor(pVm->pDb,pCol->pCursor);
/* Unlink */
if( pCol->pPrevCol ){
pCol->pPrevCol->pNextCol = pCol->pNextCol;
}else{
sxu32 iBucket = pCol->nHash & (pVm->iColSize - 1);
pVm->apCol[iBucket] = pCol->pNextCol;
}
if( pCol->pNextCol ){
pCol->pNextCol->pPrevCol = pCol->pPrevCol;
}
MACRO_LD_REMOVE(pVm->pCol,pCol);
pVm->iCol--;
SyMemBackendPoolFree(&pVm->sAlloc,pCol);
return UNQLITE_OK;
}
/*
* bool db_drop_record(string $col_name,int64 record_id)
* Remove a given record from a collection.
* Parameter
* col_name: Collection name.
* record_id: ID of the record.
* Return
* TRUE on success. FALSE on failure.
*/
static int unqliteBuiltin_db_drop_record(jx9_context *pCtx,int argc,jx9_value **argv)
{
unqlite_col *pCol;
const char *zName;
unqlite_vm *pVm;
SyString sName;
jx9_int64 nId;
int nByte;
int rc;
/* Extract collection name */
if( argc < 2 ){
/* Missing arguments */
jx9_context_throw_error(pCtx,JX9_CTX_ERR,"Missing collection name and/or records");
/* Return false */
jx9_result_bool(pCtx,0);
return JX9_OK;
}
zName = jx9_value_to_string(argv[0],&nByte);
if( nByte < 1){
jx9_context_throw_error(pCtx,JX9_CTX_ERR,"Invalid collection name");
/* Return false */
jx9_result_bool(pCtx,0);
return JX9_OK;
}
SyStringInitFromBuf(&sName,zName,nByte);
pVm = (unqlite_vm *)jx9_context_user_data(pCtx);
/* Fetch the collection */
pCol = unqliteCollectionFetch(pVm,&sName,UNQLITE_VM_AUTO_LOAD);
if( pCol == 0 ){
jx9_context_throw_error_format(pCtx,JX9_CTX_ERR,"No such collection '%z'",&sName);
/* Return false */
jx9_result_bool(pCtx,0);
return JX9_OK;
}
/* Extract the record ID */
nId = jx9_value_to_int64(argv[1]);
/* Drop the record */
rc = unqliteCollectionDropRecord(pCol,nId,1,1);
/* Processing result */
jx9_result_bool(pCtx,rc == UNQLITE_OK);
return JX9_OK;
}
