0

我正在尝试使用服务器返回的字典更新 iPhone 上的 SQLite 数据库。sqlite3_step 返回 sqlite_ok 但数据库仍然是空的。无论如何,在 sqlite3_step 之后插入了一个可能错误的日志,这将返回“数据库锁定”,所以我认为我的代码中的 sqlite 函数顺序有问题。我还验证了字典包含迭代内带有日志的数据,它为我提供了我期望找到的所有内容。

这里有什么问题?有人能帮我吗?对不起我的英语不好,谢谢马可

 //----- database update -----------------------------------------------------------------------------------------------------
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"DB.sqlite"];

if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) {
    hasError= false;         
     const char *update_stmt="REPLACE INTO table VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?)";
        sqlite3_stmt *compiledstatement;
        if(sqlite3_prepare_v2(database,update_stmt , -1, &compiledstatement, NULL)==SQLITE_OK) {
            for (NSDictionary *item in [update objectForKey:@"table1"]) {
                sqlite3_bind_int(compiledstatement, 1,[[item objectForKey:@"a"]integerValue]);
                sqlite3_bind_text(compiledstatement,2,[[item objectForKey:@"b"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,3,[[item objectForKey:@"c"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,4,[[item objectForKey:@"d"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_int(compiledstatement,5,[[item objectForKey:@"e"] integerValue]);
                sqlite3_bind_double(compiledstatement,6,[[item objectForKey:@"f"] doubleValue]);
                sqlite3_bind_text(compiledstatement,7,[[item objectForKey:@"g"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,8,[[item objectForKey:@"s"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,9,[[item objectForKey:@"g"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,10,[[item objectForKey:@"u"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_text(compiledstatement,11,[[item objectForKey:@"y"] UTF8String], -1, SQLITE_TRANSIENT);
                sqlite3_bind_int(compiledstatement,12,[[item objectForKey:@"n"] integerValue]);
                sqlite3_bind_int(compiledstatement,13,[[item objectForKey:@"k"] integerValue]);
                //sqlite3_bind_text(compiledstatement,2,[@"" UTF8String], -1, SQLITE_TRANSIENT);
                if(!sqlite3_step(compiledstatement)==SQLITE_DONE) {hasError= true; NSLog(@"error (%s)", sqlite3_errmsg(database));} //error
                NSLog(@"error (%s)", sqlite3_errmsg(database));
                sqlite3_reset(compiledstatement);
            }
            sqlite3_finalize(compiledstatement);
        }else { NSLog(@"prepare FAILED (%s)", sqlite3_errmsg(database));}        
} else {NSLog(@"opening error");}
sqlite3_close(database);

编辑:

我无法理解为什么这段代码不起作用!!!我还没有找到最终的解决方案。

我总是在 COMMIT 收到“不按顺序调用的库例程”,为什么?这个顺序不对吗?

-open -begin -prepare -循环字典(绑定,步进和重置;对于字典中的每个项目,我必须插入或替换一行) -finalize -commit -close

如果我删除开始并提交 exec 我在“步骤”上出现错误“数据库已锁定”,当代码尝试插入第一行时......这是一场噩梦......

再次感谢你的帮助!!

    //----- database update -----------------------------------------------------------------------------------------------------

const char *updateTags_stmt="REPLACE INTO tags VALUES(?,?,?)";

if (sqlite3_open_v2([dbPath UTF8String], &database,SQLITE_OPEN_READWRITE,NULL) != SQLITE_OK) {
    sqlite3_close(database);return;
}

if (sqlite3_exec(database, "BEGIN", 0, 0, 0)!=SQLITE_OK) {sqlite3_close(database);return;}

sqlite3_stmt *compiledstatement;


    if(sqlite3_prepare_v2(database,updateTags_stmt , -1, &compiledstatement, NULL)!=SQLITE_OK) {sqlite3_close(database);return;}

        for (NSDictionary *item in [update objectForKey:@"tags"]) {
            sqlite3_bind_int(compiledstatement,1,[[item objectForKey:@"tid"] integerValue]);
            sqlite3_bind_text(compiledstatement,2,[[item objectForKey:@"categoria"] UTF8String], -1, SQLITE_TRANSIENT);
            sqlite3_bind_text(compiledstatement,3,[[item objectForKey:@"tag"] UTF8String], -1, SQLITE_TRANSIENT);
            if(sqlite3_step(compiledstatement)!=SQLITE_DONE) {
                sqlite3_finalize(compiledstatement);
                sqlite3_close(database);
                return;
            } else {if (sqlite3_reset(compiledstatement)!=SQLITE_OK){sqlite3_close(database);return;}}
        }
        if (sqlite3_finalize(compiledstatement)!=SQLITE_OK){sqlite3_close(database);return;}



    if (sqlite3_exec(database, "COMMIT", NULL, NULL, 0)!=SQLITE_OK) {sqlite3_close(database);return;}


if (sqlite3_close(database)!=SQLITE_DONE){sqlite3_close(database);return;}
4

2 回答 2

0

最后我发现了问题:在另一个类上还有另一个查询,其中 then 语句没有最终确定,所以数据库仍然保持打开状态......这节课两周!呵呵对不起!

于 2013-12-19T07:26:14.097 回答
0

这段代码是错误的;它首先反转 的返回值sqlite3_step,然后将该值与SQLITE_DONE(因为!返回 0 或 1 而永远不会成功)进行比较:

if(!sqlite3_step(compiledstatement)==SQLITE_DONE)

正确地做:

if (sqlite3_step(compiledstatement) != SQLITE_DONE)
于 2013-12-08T18:44:01.963 回答