目标C中的Sqlite数据库插入语句 [英] Sqlite Database Insert Statement in Objective C

问题描述

我尝试只将两个整数变量插入到我的sqlite数据库中。我创建了一个名为ups.sqlite的数据库，它有一个表（upssTable），表有两列。但是当我打开/ users / ds / Library / Application Support / iPhone Simulator / 5.0 / Applications / FCB4B455-4B7F-4C47-81B6-AC4121874596 / SqliteDeneme.app / ups.sqlite时，ups.sqlite中没有数据。我的代码在这里：

I try to insert only two integer variable to my sqlite database. I created a database which name is ups.sqlite, it has a one table (upssTable) and the table have two column. But when I open /Users/ds/Library/Application Support/iPhone Simulator/5.0/Applications/FCB4B455-4B7F-4C47-81B6-AC4121874596/SqliteDeneme.app/ups.sqlite there is no data in ups.sqlite. My code is here:

- (IBAction)buttonClick:(id)sender {

NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSString *dbPath = [self getDBPath];
BOOL success = [fileManager fileExistsAtPath:dbPath]; 

if(!success) {

    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ups.sqlite"];
    success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error];

    if (!success) 
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
}   

NSLog(@"database path %@",dbPath);


if(!(sqlite3_open([dbPath UTF8String], &cruddb) == SQLITE_OK))
{
    NSLog(@"An error has occured.");
}

if(sqlite3_open([dbPath UTF8String], &cruddb) ==SQLITE_OK){

    NSString *  str1 =@"1";
    NSString * str2 =@"1";


    const char *sql = "INSERT INTO upssTable (column1, column2) VALUES (?,?)"; 

    NSInteger result = sqlite3_prepare_v2(cruddb,sql, -1, &stmt, NULL);
    NSLog(@"upss %s\n", sqlite3_errmsg(cruddb));

    if(result == SQLITE_OK)        
    {
        sqlite3_bind_int(stmt, 1, [str1 integerValue]);
        sqlite3_bind_int(stmt, 2, [str2 integerValue]);

    }
    else
    {
        NSAssert1(0, @"Error . '%s'", sqlite3_errmsg(cruddb));                        
    }
    sqlite3_reset(stmt);
    sqlite3_finalize(stmt);
    sqlite3_close(cruddb);
}
}

- (NSString *) getDBPath {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
return [documentsDir stringByAppendingPathComponent:@"ups.sqlite"];
}

如何解决这个问题？请帮帮我。感谢您的回复。

How can I solve this problem? Please help me. Thanks for your reply.

推荐答案

您正在创建sqlite3语句，但实际上并没有使用 sqlite3_step（）执行它。

You are creating your sqlite3 statement, but you aren't actually executing it using sqlite3_step().

您是否也打算两次打开数据库？

Also you appear to be opening the database twice?

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