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-(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);

}

アプリは初めて正常に動作しますが、再起動すると、以前の値を読み取ることはできますが、新しい値を挿入することはできません... pls help

これが私がこれを呼んでいる方法です....

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];
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1 に答える 1

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こんにちはAnkit私はあなたのコードを使用して電話しました

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

私が変更した唯一のことは、checkAndCreateDatabase関数で選択した別のデータベースファイルを使用することです

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

コードは、新しい uId を持つすべての挿入に対して正常に機能しました。読み取り関数を確認し、可能であれば読み取り関数のコードを上記のコードと一緒に貼り付け、これら 2 つの Viz 読み取り関数と挿入関数を呼び出す方法を貼り付けます。

于 2011-05-18T04:40:18.100 に答える