I cannot get the data from the Sqlite database

I cannot get the data from the Sqlite database. It doesn't print anything for me. I checked the connection to the db is made and the database contains the data. It gives no error but does not print anything. When I start the app the tableView contains no records.

In console print this:

API call with NULL database connection pointer
misuse at line 139466 of [d24547a13b]
prepare: out of memory

// AppDelegate.swift

import UIKit
import SQLite3

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        
DataManager.dataManager.dbOpaquePointer = DataManager.dataManager.openDatabase(dbName: "DB.sqlite")
        
return true

}

}

// TableWord.swift

import Foundation

class TableWord{

    var idword: Int = 0
    var word: String = ""
    var features: String = ""
    var number: Int = 0
    
    init(idword: Int, word: String, features: String, number: Int) {
        self.idword = idword
        self.word = word
        self.features = features
        self.number = number
    }
    
}

// DataManager.swift

import UIKit
import SQLite3


class DataManager {
    
    static let dataManager = DataManager()

    var dbOpaquePointer: OpaquePointer?
    
    // OPEN
    func openDatabase(dbName: String) -> OpaquePointer? {
        

        let documentDirectory = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
        let fileUrl = documentDirectory?.appendingPathComponent(dbName).relativePath
        
        
        guard let part1DbPath = fileUrl else {
            print("part1DbPath is nil.")
            return nil
        }
        

        if sqlite3_open(part1DbPath, &dbOpaquePointer) == SQLITE_OK {
            print(“Open database in \(part1DbPath)")
            return dbOpaquePointer
        } else {
            print("\(Errors.SQLiteError.openDatabase)")
        }
        
        return dbOpaquePointer
        
    }
    
    
    
    // SELECT
    func selectTableWord() -> [TableWord] {
        
        let querySelectTableWord = "SELECT * FROM tableword;"
        
        var dbOpaquePointer2: OpaquePointer? = nil
        
        var dataTableWord: [TableWord] = []
        
        if sqlite3_prepare_v2(dbOpaquePointer, querySelectTableWord, -1, &dbOpaquePointer2, nil) == SQLITE_OK {
            
            while (sqlite3_step(dbOpaquePointer2) == SQLITE_ROW) {
                
                let idword = sqlite3_column_int(dbOpaquePointer2, 0)
                
                guard let queryResultCol1 = sqlite3_column_text(dbOpaquePointer2, 1) else {
                    print("\(Errors.SQLiteError.queryNil)")
                    return dataTableWord
                }
                
                let word = String(cString: queryResultCol1)
                
                guard let queryResultCol2 = sqlite3_column_text(dbOpaquePointer2, 2) else {
                    print("\(Errors.SQLiteError.queryNil)")
                    return dataTableWord
                }
                
                let features = String(cString: queryResultCol2)
                
                let number = sqlite3_column_int(dbOpaquePointer2, 3)
                
                dataTableWord.append(TableWord(idword: Int(idword), word: word, features: features, number: Int(number)))
                
            }
            
            
        } else {
            let errorMessage = String(cString: sqlite3_errmsg(dbOpaquePointer2))
            print("\(Errors.SQLiteError.prepare): \(errorMessage)")
        }
        
        sqlite3_finalize(dbOpaquePointer2)
        
        return dataTableWord
        
    }
    
    
}

// ViewController.swift

import UIKit
import SQLite3

class ViewController: UIViewController, UITextViewDelegate, UITableViewDataSource {
    
    @IBOutlet weak var resultTableView: UITableView!
    
    var db: DataManager = DataManager()
    
    var dataTableWord: [TableWord] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        dataTableWord = db.selectTableWord()
        
        searchTextView.delegate = self
        resultTableView.dataSource = self
        
    }

    //MARK: - UITableViewDataSource

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataTableWord.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "idCell1Main1", for: indexPath) as! TableViewCell
        
       cell.cellLabelNumber.text = String(dataTableWord[indexPath.row].idword)
       cell.cellLabelTitle.text = dataTableWord[indexPath.row].word
       cell.cellLabelSubtitle.text = dataTableWord[indexPath.row].features

    return cell

    }

}