如何使用sqlite數據庫插入數據？

Question

- (void)viewDidLoad { 
    // Do any additional setup after loading the view, typically from a nib. 

    NSString *docsDir; 

    NSArray *dirPaths; 

    dirPaths=NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES); 

    docsDir =[dirPaths objectAtIndex:0]; 

    databasePath=[[NSString alloc]initWithString: [docsDir stringByAppendingString:@"test2.db"]]; 

    //databasePath=[NSString stringWithFormat:[docsDir stringByAppendingPathComponent:@"test2.db"]]; 

    NSFileManager *filemgr=[NSFileManager defaultManager]; 

    if ([filemgr fileExistsAtPath:databasePath] ==NO) 
    { 
     const char *dbpath = [databasePath UTF8String]; 

     if (sqlite3_open(dbpath, &test2DB) ==SQLITE_OK) 
     { 
      char *errMSg; 

      const char *sql_stmt= "CREATE TABLE IF NOT EXISTS TESTING (ID INTEGER PRIMARY KEY AUTOINCREMENT, FIRSTNAME TEXT, LASTNAME TEXT, EMAIL TEXT, ADDRESS TEXT)"; 

      if (sqlite3_exec(test2DB, sql_stmt, NULL, NULL, &errMSg) != SQLITE_OK) 
      { 
       status.text=@"Failed To Create Table"; 
      } 
      sqlite3_close(test2DB); 
     }else{ 
      status.text =@"Failed to open/create database"; 
     } 
    } 
    [super viewDidLoad]; 

} 

//保存數據

-(IBAction)save:(id)sender 
{ 
    sqlite3_stmt *statment; 

    const char *dbpath =[databasePath UTF8String]; 

    if (sqlite3_open(dbpath, &test2DB) ==SQLITE_OK) { 
     NSString *insertSQL = [NSString stringWithFormat:@"INSERT INTO TESTING(Firstname,Lastname,Email,Address) VALUES (\"%@\", \"%@\", \"%@\", \%@\")",Firstname.text,Lastname.text,Email.text,Address.text]; 

     const char *insert_stmt=[insertSQL UTF8String]; 
     sqlite3_prepare_v2(test2DB, insert_stmt, -1, &statment, NULL); 

     if (sqlite3_step(statment) ==SQLITE_DONE) { 
      status.text=@"Details Added"; 
      Firstname.text=@""; 
      Lastname.text=@""; 
      Email.text=@""; 
      Address.text=@""; 
     }else 
     { 
      status.text=@"Failed to Add Details"; 
     } 
     sqlite3_finalize(statment); 
     sqlite3_close(test2DB); 
    } 
} 

Answer 1

改變數據庫名稱作爲test2.sqlite，NSDocumentDirectory並使用此代碼，這將節省您的數據：

- (IBAction) saveData 
{ 
    sqlite3_stmt *statement; 

    const char *dbpath = [databasePath UTF8String]; 

    if (sqlite3_open(dbpath, &Information) == SQLITE_OK) 
    { 
     NSString *insertSQL = [NSString stringWithFormat: @"INSERT INTO CONTACTS (name, address, phone,imageUrl) VALUES (\"%@\", \"%@\", \"%@\",\"%@\")", name.text, address.text, phone.text,imageUrl.text]; 

     const char *insert_stmt = [insertSQL UTF8String]; 

     sqlite3_prepare_v2(Information, insert_stmt, -1, &statement, NULL); 
     if (sqlite3_step(statement) == SQLITE_DONE) 
     { 
      status.text=@"Details Added"; 
     Firstname.text=@""; 
     Lastname.text=@""; 
     Email.text=@""; 
     Address.text=@"" 
     } else { 
      status.text = @"Failed to add contact"; 
     } 
     sqlite3_finalize(statement); 
     sqlite3_close(test2); 
    } 
} 

Answer 2

不NSDocumentationDirectory。這是NSDocumentDirectory。