Question

-(void)checkAndCreateDatabase{
    NSLog(@"hello");
    databaseName = @"EMAP234.sql";
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDir = [documentPaths objectAtIndex:0];
    databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
    NSLog(@"database path %@",databasePath);
    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) return;

    // 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];
}

-(void)insertIntoDatabase:(NSString *)insertCommand{
    // 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 = [insertCommand UTF8String];
        sqlite3_stmt *compiledStatement;


        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
            // Loop through the results and add them to the feeds array
            NSLog(@"inserted");
            while(sqlite3_step(compiledStatement) == SQLITE_ROW) {}
        }

        // Release the compiled statement from memory
        sqlite3_finalize(compiledStatement);

    }
    sqlite3_close(database);

}

该应用程序第一次运行正常，但是当我重新启动它时，它可以读取较早的值，但无法插入新值...请帮助

这就是我如何称呼它......

DatabaseOperations *obj=[[DatabaseOperations alloc]init];
[obj checkAndCreateDatabase];
NSLog(@"patient ID %d",[obj readMaxPatientIDFromDatabase]);

patientID= [NSString stringWithFormat:@"HCI%d", ([obj readMaxPatientIDFromDatabase]+1)];
NSLog(@"patient ID %@",patientID);
[self generatePatientInsertCommand];
[obj insertIntoDatabase:patientInsertCommand];
[self generateCarrierInsertCommand];
[obj insertIntoDatabase:carrierInsertCommand];
[self generateSyncTableInsertCommand];
[obj insertIntoDatabase:syncTableInsertCommand];
NSString *msg=@"your PatientID is";
[obj release];
msg=[msg stringByAppendingString:patientID];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"REGISTERED" message:msg delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil];
[alert show];
[alert release];

Answer 1

Hello Ankit我使用了你的代码并调用了

[self checkAndCreateDatabase];
[self insertIntoDatabase:[NSString stringWithFormat:@"INSERT INTO User (uId,userName,userBirthday) VALUES (\"%d\", \"%@\", \"%@\" )",3,@"Admin",@"2010-12-01"]];

我唯一改变的是使用我在checkAndCreateDatabase函数中选择的不同数据库文件

-(void)checkAndCreateDatabase{
    NSLog(@"hello");
    databaseName = @"MasterDB.sqlite";
....
}

该代码适用于每个带有新uId的插入。请检查您的读取功能和如果可能，然后粘贴读取功能的代码以及上述代码以及您调用这两个读取和插入功能的方式。

当应用程序终止并再次启动时，无法在iphone的sqlite数据库中插入

1 个答案: