我在iPhone模拟器上遇到SQLite问题。我已经减少到一个简单的测试应用程序。 sqlite3_prepare_v2失败。但真正的设备工作正常。SQLite在设备上工作,但不在模拟器中。 sqlite3_prepare_v2失败
我使用sqlite3创建了一个数据库,并将其添加到我的资源中。在我的代码中,在viewDidLoad中,我调用了createEditableCopyOfDatabaseIfNeeded(这是一种常见的,广泛使用的方法,随处可见)。然后我打电话以下几点: -
- (void) queryDatabase {
sqlite3 *database;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"myDatabase.sql"];
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
NSMutableString *result = [[NSMutableString alloc] init];
const char *sqlStatement = "select * from people";
sqlite3_stmt *compiledStatement;
if (sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
NSString *firstname = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *surname = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
[result appendFormat:@"%@ %@\n", firstname, surname];
}
[resultView setText:result];
}
else {
[resultView setText:@"Problem querying database"];
}
sqlite3_finalize(compiledStatement);
[result release];
}
sqlite3_close(database);
}
在模拟器上,sqlite3_prepare_v2不返回SQLITE_OK