我在AppDelegate类的方法applicationDidEnterBackground中编写了删除查询。但是当我停止模拟器时它不会删除数据库表。我想在应用程序在后台输入或应用程序终止时删除数据库表。这是删除表查询的- (void)applicationDidEnterBackground:(UIApplication *)application {
sqlite3 *database;
NSArray * dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* docsDir = [dirPaths objectAtIndex:0];
NSString * databasePath = [docsDir stringByAppendingPathComponent:@"sssw.sqlite"];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSString *sqlStatement_userInfo =[NSString stringWithFormat:@"DELETE * from SHOPDATA"];
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, [sqlStatement_userInfo UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
{
NSLog(@"table deleted");
}
else
{
NSLog(@"Unable to delete table");
}
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
}
方法。
HAVING请告诉我该怎么做以及我在这里做错了什么。 任何帮助将不胜感激。