Question

我正在为学校的最终项目制作一个iphone应用程序，我遇到了一些麻烦。我把它连接到一个sqlite数据库，但即使我没有在xcode中得到任何错误，当我用调试器逐步执行代码时它表明它正在工作 - 但它实际上并没有更新。我在网上看到了一些其他类似问题的线程，但我无法通过查看它们来解决问题。这是相关的代码，但如果你认为你需要看到更多，我很乐意发布所有内容：首先调用createAndCheckCode方法，然后调用addRecipe方法。我只是通过一个通用字符串，直到我可以弄清楚如何让它工作。我可以从不同的程序中查看数据库内容。

(void) addToDatabase
{
    databaseName = @"recipeappdatabase.sqlite";

// Get the path to the documents directory and append the databaseName
NSArray *documentPaths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,         
   NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];



// Check if the SQL database has already been 
//saved to the users phone, if not then copy it over
BOOL success;

// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];

// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:databasePath];

// If the database already exists then return without doing anything
if(!success)
{

// If not then proceed to copy the database from the application to the users filesystem

// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath]          stringByAppendingPathComponent:databaseName];

// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];

[fileManager release];
}

// Setup the database object
sqlite3 *database;

// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "insert into Recipes (title) VALUES ('toor')";
sqlite3_stmt *compiledStatement;

if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) ==      SQLITE_OK) {


sqlite3_bind_text(compiledStatement, 1, sqlStatement, -1, SQLITE_TRANSIENT);
}
//if (sqlite3_step(compiledStatement) != SQLITE_DONE)
//NSAssert1(0, @"Error updating table: %s", errorMsg);
sqlite3_finalize(compiledStatement);

}
sqlite3_close(database);


 }

编辑/删除讯息

即使没有错误，也无法添加到sqlite数据库

0 个答案: