ios - SQLite 使用 FMDB : Insert record not working/no such table

请帮我找出问题所在。

插入语句不起作用，当我检查保存在 /Users/jppangilinan/Library/Application Support/iPhone Simulator/4.3/Applications/61BBA03F-C240-414D-9A64-6CE3B34DF9C2/Documents/person.sqlite3 似乎保存在该位置的数据库没有任何表，这就是插入语句不起作用的原因。为什么它没有在我的项目的资源文件夹中复制我的 sqlite db？ TIA

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docsPath = [paths objectAtIndex:0];
    NSString *path = [docsPath stringByAppendingPathComponent"person.sqlite3"];

FMDatabase *database = [FMDatabase databaseWithPath:path];
[database open];

[database beginTransaction];

NSString *query = [NSString stringWithFormat"insert into person(rowid,fname,lname,address) values (null, '%@','%@','%@')",fname.text,lname.text,address.text];

NSLog(@" %@",path);
NSLog(@" %@",query);

BOOL y= [database executeUpdate:query];

if (!y)
{
    NSLog(@"insert failed!!");
}

NSLog(@"Error %d: %@", [database lastErrorCode], [database lastErrorMessage]);



[database commit];
[database close];

}

---

Best Answer-推荐答案

为了在应用程序的 Documents 文件夹中访问您的资源数据库，您首先需要在应用程序启动时将其复制到那里。

如果数据库文件在你的 xcode 项目的资源文件夹中，它不会自动复制到应用程序的文档目录中。

为此，您可以使用:

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSError *error;

NSString *databasePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent"person.sqlite3"];

[[NSFileManager defaultManager] copyItemAtPath:databasePath 
                                                toPath:[NSString stringWithFormat"%@/%@",documentsDirectory,@"person.sqlite3"]
                                                 error:&error];

您将能够使用现有代码访问现在位于文档文件夹中的数据库。

发生的情况是，由于没有复制现有的 DB 文件，当您调用 databaseWithPath 时会创建一个新的空文件，这就是您收到 Error 1: no 的原因这样的表:人错误。

来自 FMDB documentation :

Database Creation

An FMDatabase is created with a path to a SQLite database file. This path can be one of these three:

A file system path. The file does not have to exist on disk. If it does not exist, it is created for you. An empty string (@""). An empty database is created at a temporary location. This database is deleted with the FMDatabase connection is closed.

NULL. An in-memory database is created. This database will be destroyed with the FMDatabase connection is closed.

FMDatabase *db = [FMDatabase databaseWithPath"/tmp/tmp.db"];

关于ios - SQLite 使用 FMDB : Insert record not working/no such table ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8499588/