Question

我制作了iPad应用程序，

我想将记录插入数据库表，但我无法做同样的事情。

这是我的代码段，

-(void) insertRecordIntoTableNamed: (NSString *) symbol{

NSString *sql = [NSString stringWithFormat:@"INSERT INTO recentquotes ('symbol', 'dt_tm') VALUES ('%@',datetime())",symbol];

   NSLog(@"sql=%@",sql);

    char *err;                          

    if (sqlite3_exec(db, [sql UTF8String], NULL, NULL, &err) != SQLITE_OK)
    {
        sqlite3_close(db);
        NSAssert(0, @"Error updating table.");
    }

}

我的NSLog显示：

sql=INSERT INTO recentquotes ('symbol', 'dt_tm') VALUES ('PATNI',datetime())

此声明是正确的，但我无法在数据库表中看到VALUES PATNI和datetime()

这是代码的其余部分，

NSString *filePahs = Nil;
-(NSString *) filePath {

    filePahs=[[NSBundle mainBundle] pathForResource:@"companymaster" ofType:@"sql"];
    NSLog(@"path=%@",filePahs);
    return filePahs;
}

上述方法的结果是：

path = / Users / krunal / Library / Application Support / iPhone Simulator / 5.0 / Applications / 9FF61238-2D1D-4CB7-8E24-9AC7CE9415BC / iStock kotak.app/companymaster.sql

-(void) openDB {
    //---create database---

    if (sqlite3_open([[self filePath] UTF8String], &db) != SQLITE_OK )
    {
        sqlite3_close(db);
        NSAssert(0, @"Database failed to open.");
    }
}



-(void) getAllRowsFromTableNamed: (NSString *) tableName {
    //---retrieve rows---
    NSString *qsql = @"SELECT * FROM recentquotes";
    sqlite3_stmt *statement;

    if (sqlite3_prepare_v2( db, [qsql UTF8String], -1, &statement, nil) ==
        SQLITE_OK) {
        NSLog(@"b4 while");
        while (sqlite3_step(statement) == SQLITE_ROW)
        {
            char *field1 = (char *) sqlite3_column_text(statement, 0);
                NSString *field1Str = [[NSString alloc] initWithUTF8String: field1]; 

            [recentqotarray addObject:field1Str];
            [field1Str release];

        }
        //---deletes the compiled statement from memory---
        sqlite3_finalize(statement);
        NSLog(@"recentqotarray=%@",recentqotarray);
    }   
}

修改

我写了这个，当我检查我的日志时，我得到这样的“在查找数据”，我没有得到我的sql = ...

     - (void) finddata
{
    NSString *databasePath;
    const char *dbpath = [databasePath UTF8String];
    sqlite3_stmt    *statement;

    NSLog(@"in finddata");
    if (sqlite3_open(dbpath, &db) == SQLITE_OK)
    {
        NSString *querySQL = [NSString stringWithFormat: @"SELECT * FROM recentquotes"];
        NSLog(@"sql=%@",querySQL);
        const char *query_stmt = [querySQL UTF8String];

        if (sqlite3_prepare_v2(db, query_stmt, -1, &statement, NULL) == SQLITE_OK)
        {
            while (sqlite3_step(statement) == SQLITE_ROW)
            {                
                NSLog(@"Inside recent quote table");
                char *field1 = (char *) sqlite3_column_text(statement, 0);
                NSLog(@"Column name=%s",field1);
                NSString *field1Str = [[NSString alloc] initWithUTF8String: field1]; 


                [recentqotarray addObject:field1Str];
                NSLog(@"array=%@",recentqotarray);

              } 
            sqlite3_finalize(statement);
        }
        sqlite3_close(db);
    }
}

提前致谢

Answer 1

在你的：

NSString *sql = [NSString stringWithFormat:@"INSERT INTO recentquotes ('symbol', 'dt_tm') VALUES ('%@',datetime())",symbol];

而不是'%@'尝试使用\"%@\"，并检查它是否插入到您的数据库中。

编辑：

我最近一直在研究数据库，并且我已经能够成功地在我的sqlite中插入数据，我会写下我使用的检查是否有帮助：

NSArray*dirPath;
NSString*docDir;


dirPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docDir=[dirPath objectAtIndex:0];
databasePath=[docDir stringByAppendingPathComponent:@"example.sqlite"];


BOOL success;

NSFileManager*fm=[NSFileManager defaultManager];
success=[fm fileExistsAtPath:databasePath];

if(success)
{
   NSLog(@"Already present");
}

NSString*bundlePath=[[NSBundle mainBundle] pathForResource:@"example" ofType:@"sqlite"];
NSError*error;
success=[fm copyItemAtPath:bundlePath toPath:databasePath error:&error];

if(success)
{
    NSLog(@"Created successfully");
}
const char*dbPath=[databasePath UTF8String];

if(sqlite3_open(dbPath, &myDB)==SQLITE_OK)
{

        NSString*insertSQL=[NSString stringWithFormat:@"insert into extable (name) values (\"%@\")",[nametextField.text]];

        const char*insertStmt=[insertSQL UTF8String];
        char *errmsg=nil;

        if(sqlite3_exec(myDB, insertStmt, NULL, NULL, &errmsg)==SQLITE_OK)
        {
            NSLog(@"ADDED!");
        }

 sqlite3_close(myDB);
}

无法在目标c中的表中插入记录

修改

1 个答案: