iphone - 添加 SQLcipher sqlite3_exec 后返回 SQLITE_NOTADB

Question

我将 SQLCipher 配置为他们网站上的教程...我可以编译并运行该项目。但是 sqlite3_exec 在尝试执行语句时返回 SQLITE_NOTADB。

请在下面找到代码片段:

=================

NSString *dbPath = [self getDBPath];
BOOL success = [fileManager fileExistsAtPath:dbPath];           
if(success) {
    int sql_results = sqlite3_open([dbPath UTF8String], &SQLDB);            
    const char* key = [@"BIGSecret" UTF8String];
    sqlite3_key(SQLDB, key, strlen(key));
    if (sql_results == SQLITE_OK) {
        NSString *sql;
        const char *update_sql; 
        sql = [NSString stringWithFormat:@"DROP table %@",tablename];
        update_sql = [sql cStringUsingEncoding:NSUTF8StringEncoding];
        if(sqlite3_exec(SQLDB, update_sql, nil, nil, nil) == SQLITE_OK) { 
            NSLog(@"Good to go %@ dropped",tablename);
        }
        else {      
            NSLog(@"Bad Delete Cat SQL: %s -- %d", update_sql,sql_results); 
            NSLog(@"error code %i", sql_results);
        }

无法解决问题，我哪里出错了....

谢谢，

本

Answer 1

从邮件列表交叉发布:

I noticed in your code that you are only entering the block to sqlite3_open if the database file exists. Are you by chance trying to encrypt an existing standard SQLite database using SQLCipher using this code? If so, calling sqlite3_key will not work that way. You'd instead want to open the standard SQLite database, attach a new encrypted database, and then export the data between the two. There are some more details on this procedure here:

http://sqlcipher.net/sqlcipher-api/#sqlcipher_export

Once you're dealing with an encrypted database you can call sqlite3_key as the first operation before using it.