Ios 如何在Objective-C中执行多个sql

我有一个向量，需要使用for来读取和执行sql查询这是我的代码：

for (int i=0; i < total; i++) {
    NSString *consultaRelacionEnvios;
    consultaRelacionEnvios = [[NSString alloc] initWithFormat:@"SELECT * FROM RELACIONENVIOS WHERE ID=%@",almacenIDAviso];
    SQLClient* client = [SQLClient sharedInstance];
    client.delegate = self;
    [client connect:URLConsulta username:@"usernameDB" password:@"passwordDB" database:nameDB completion:^(BOOL success) {
        if (success)
        {
             [client execute:consultaRelacionEnvios completion:^(NSArray* results) {
                 [self process0:results];
                 [client disconnect];
             }];
        }
    }];
}

- (void)process0:(NSArray*)data {
    for (NSArray* table in data)
        for (NSDictionary* row in table)
            for (NSString* column in row)
                [almacenRelacionEnvios addObject:row[column]];
    NSLog(@"%@",almacenRelacionEnvios);
}

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你有问题吗？您发布的代码有什么问题？这意味着什么？仅在nslog LLDB中显示，然后您的应用程序崩溃或遇到断点。看见