Iphone iOS:Sqlite数据库错误：由于未捕获异常而终止应用程序'；n内部一致性异常'；，原因:'；准备语句时出错'；

我在应用程序中使用了sqlite DB，我需要同时调用两个查询，但我给出的错误是：由于未捕获的异常“nsInternalInconsistencException”终止应用程序，原因是：“准备语句时出错”

我每10秒运行一次计时器，用于在按钮事件后从DB选择行和在DB中插入行

我的代码片段为：

在

视图中，将出现
：

int result2 = sqlite3_open([dbPath UTF8String], &database);
if (result2 != SQLITE_OK) {
    NSLog(@"Failure in connecting to the database with result %d",result2);
}
else {
    NSLog(@ "Succesfully opened connection to DB") ;

}

int result = sqlite3_close(database);
if (result != SQLITE_OK){
    NSLog(@"Failure in closing connection to database. Result %d",result);
}
else {
    NSLog(@"Successfully closed DB connection") ;
}

并且在
视图中将消失
：

int result2 = sqlite3_open([dbPath UTF8String], &database);
if (result2 != SQLITE_OK) {
    NSLog(@"Failure in connecting to the database with result %d",result2);
}
else {
    NSLog(@ "Succesfully opened connection to DB") ;

}

int result = sqlite3_close(database);
if (result != SQLITE_OK){
    NSLog(@"Failure in closing connection to database. Result %d",result);
}
else {
    NSLog(@"Successfully closed DB connection") ;
}

对于插入行的
：

NSString *queryInsert = [NSString stringWithFormat: @"insert into mail_snoozlist (msgBody,msgSubject, msgSender,msgTo,msgDate,snoozTime) values('%@','%@','%@','%@','%@','%@')",strBody,msgSub,msgFrom,msgTo,strMsgDate,stringFromDate];

    NSLog(@"queryInsert:%@",queryInsert);

    const char *sql = [queryInsert UTF8String];

    if(sqlite3_prepare_v2(database, sql, -1, &statement, NULL) == SQLITE_OK) {
        sqlite3_step(statement);
        sqlite3_reset(statement);

    } else {

        NSAssert1(0,@"error preparing statement",sqlite3_errmsg(database));
        return;
    }

    sqlite3_finalize(statement);

NSString *querySQL2 = [NSString stringWithFormat: @"Select * from mail_snoozlist WHERE snoozTime = '%@'",_snoozTime];

    NSLog(@"querySql:%@",querySQL2);

    if (sqlite3_prepare_v2(database, [querySQL2 UTF8String], -1, &statement, NULL) == SQLITE_OK)
    {

        while (sqlite3_step(statement) == SQLITE_ROW)
        {
            Message *obj = [[Message alloc] init];

            NSString *msgBody=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1)];
            obj.msgBody= msgBody;

            NSString *msgSub=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
            obj.msgSub= msgSub;

            NSString *msgSender=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 3)];
            obj.msgFrom= msgSender;

            NSString *msgTo=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 4)];
            obj.msgTo= msgTo;

            NSString *msgDate=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 5)];
            obj.msgDate= msgDate;

            [listOfItems addObject:obj];

            [self.tableView reloadData];
        }

        sqlite3_reset(statement);
        sqlite3_finalize(statement);

对于
选择行
：

NSString *queryInsert = [NSString stringWithFormat: @"insert into mail_snoozlist (msgBody,msgSubject, msgSender,msgTo,msgDate,snoozTime) values('%@','%@','%@','%@','%@','%@')",strBody,msgSub,msgFrom,msgTo,strMsgDate,stringFromDate];

    NSLog(@"queryInsert:%@",queryInsert);

    const char *sql = [queryInsert UTF8String];

    if(sqlite3_prepare_v2(database, sql, -1, &statement, NULL) == SQLITE_OK) {
        sqlite3_step(statement);
        sqlite3_reset(statement);

    } else {

        NSAssert1(0,@"error preparing statement",sqlite3_errmsg(database));
        return;
    }

    sqlite3_finalize(statement);

NSString *querySQL2 = [NSString stringWithFormat: @"Select * from mail_snoozlist WHERE snoozTime = '%@'",_snoozTime];

    NSLog(@"querySql:%@",querySQL2);

    if (sqlite3_prepare_v2(database, [querySQL2 UTF8String], -1, &statement, NULL) == SQLITE_OK)
    {

        while (sqlite3_step(statement) == SQLITE_ROW)
        {
            Message *obj = [[Message alloc] init];

            NSString *msgBody=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 1)];
            obj.msgBody= msgBody;

            NSString *msgSub=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 2)];
            obj.msgSub= msgSub;

            NSString *msgSender=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 3)];
            obj.msgFrom= msgSender;

            NSString *msgTo=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 4)];
            obj.msgTo= msgTo;

            NSString *msgDate=[[NSString alloc] initWithUTF8String:(const char *) sqlite3_column_text(statement, 5)];
            obj.msgDate= msgDate;

            [listOfItems addObject:obj];

            [self.tableView reloadData];
        }

        sqlite3_reset(statement);
        sqlite3_finalize(statement);

请任何人帮我解决这个问题

谢谢
 添加这两个方法，并在插入和选择之前在insert method中调用它们

 - (void) createEditableCopyOfDatabaseIfNeeded
{


    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"dbname.sqlite"];
    success = [fileManager fileExistsAtPath:writableDBPath];
    if (success) return;
    //{

    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"dbname.sqlite"];

    success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
    // }
    if (!success)
    {
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
}


- (void)initializeDatabase
 {



NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"dbname.sqlite"];
sqlite3_open([path UTF8String], &database);
}

您应该更改
NSAssert
语句以包含错误消息：

NSAssert1(0, @"error preparing statement: %s", sqlite3_errmsg(database));

一旦你这样做了，你应该得到一个有意义的回答，这将帮助你诊断问题

如果不查看
sqlite3\u errmsg
消息，就很难诊断问题。它可以简单到列名或表名中的输入错误，也可以复杂到无法找到表，因为创建数据库时找不到该表，所以创建了一个空白数据库（没有该表）。在看到错误消息之前很难说


顺便说一句，您不应该使用
stringWithFormat
构建SQL，因为您会受到SQL注入攻击，并且如果这些文本值中有任何一个带有撇号，您也会遇到问题。您应该使用
？
占位符而不是printf样式的格式化程序，然后使用
sqlite3\u bind\u text
调用将值绑定到这些列：

NSString *queryInsert = @"insert into mail_snoozlist (msgBody,msgSubject, msgSender,msgTo,msgDate,snoozTime) values(?, ?, ?, ?, ?, ?)";

if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error preparing statement: %s",sqlite3_errmsg(database));
    return;
}

// for these 6 sqlite3_bind function calls, if any of these strings can be `nil`, then you'd
// want to call sqlite3_bind_null if that's the case, rather than sqlite3_bind_text

if (sqlite3_bind_text(statement, 1, [strBody UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 1: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_bind_text(statement, 2, [msgSub UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 2: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_bind_text(statement, 3, [msgFrom UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 3: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_bind_text(statement, 4, [msgTo UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 4: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_bind_text(statement, 5, [strMsgDate UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 5: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_bind_text(statement, 6, [stringFromDate UTF8String], -1, NULL) != SQLITE_OK) {
    NSAssert1(0,@"error binding 6: %s",sqlite3_errmsg(database));
    sqlite3_finalize(statement);
    return;
}

if (sqlite3_step(statement) != SQLITE_DONE) {
    NSAssert1(0,@"error stepping: %s",sqlite3_errmsg(database));
}

sqlite3_finalize(statement);

我用
insert
语句说明了这个问题，但是
select
语句也应该这样做。
对于调用，请使用这些行//[self-CreateEditableCopyOfDatabaseIfRequired]；[自初始化数据库]；谢谢你的回复。我在查询中做了一点更改，解决了这个问题：
NSString*queryInsert=[NSString stringWithFormat:@“插入邮件休眠列表（msgBody、msgSubject、msgSender、msgTo、msgDate、snoozTime）值（“%s”、“s”、“s”、“s”、“s”、“s”、“strobdy UTF8String”、“msgObj.msgSub UTF8String]、[msgObj.msgFrom UTF8String]、[msgObj.msgTo UTF8String]，[stringFromDate UTF8String]，[stringFromDate UTF8String]]；
谢谢您的回复。我已经通过查询中的一点更改解决了这个问题：
NSString*queryInsert=[NSString stringWithFormat:@“插入邮件睡眠列表（msgBody，msgSubject，msgSender，msgTo，msgDate，snoozTime）值（'%s'，'%s'，'%s'，'%s'，'%s'，'%s'），'%s'），[Strobdy UTString]，[msgObj.msgSub UTF8String]，[msgObj.msgFrom UTF8String]，[msgObj.msgTo UTF8String]，[strmssgdate UTF8String]，[stringFromDate UTF8String]]
@Pankaj首先，你仍然应该将
%s
添加到你的
NSAssert1
行中，否则当你出错时，你将永远看不到
sqlite3\u errmsg
。其次，在你的SQL中将
%@
更改为
%s
只是巧合地起作用，实际上并不能解决任何问题，只会使代码变得不那么清晰。第三，如果您提议的更改试图插入一个
strobody
或一个
msgSubject
中碰巧有撇号，那么您的代码仍然会崩溃。不要使用
stringWithFormat
来构建SQL，而是使用
sqlite3\u bind\u text
。另外，一个不诚实的用户可能会进行SQL注入攻击，例如，我添加了这个代码e、 但现在我得到了错误：
由于未捕获的异常“nsinternalinconsistenceexception”而终止应用程序，原因是：“错误准备语句：库例程调用顺序错误”
。我没有得到任何错误绑定日志。@Pankaj现在您的断言报告了准确的SQLite错误消息：非常好。此错误，“库例程调用顺序不正确"，表示您没有遵循。例如，如果您关闭了数据库而忽略了重新打开它，则可能会发生这种情况。我认为错误不在上面的代码中，而是在其他地方。请逐步检查代码，检查调用open、prepare、bind、Step、finalize和close的顺序。特别是在
sqlite3\o处放置断点/日志pen
和
sqlite3\u close
行。@Pankaj请参阅。