basic React Native SQLite script returning undefined which causes error - sqlite

Question

I'm trying to learn to use react-native-sqlite-storage as described on this page here:
https://github.com/andpor/react-native-sqlite-storage
I am working on a windows machine trying to build an android app. I have the following code:
import SQLite from 'react-native-sqlite-storage';
function errorCB(err) {
console.log("SQL Error: " + err);
}
function successCB() {
console.log("SQL executed fine");
}
function openCB() {
console.log("Database OPENED");
}
var db = SQLite.openDatabase("test.db", "1.0", "Test Database", 200000, openCB, errorCB);
db.transaction((tx) => {
tx.executeSql('SELECT * FROM Employees a, Departments b WHERE a.department = b.department_id', [], (tx, results) => {
console.log("Query completed");
});
});
export default 1;
When I run this, I get the error
undefined is not an object (evaluating
'NativeModules["SQLite"][method]')
The error is happening on the line var db = SQLite.openDatabase("test.db", "1.0", "Test Database", 200000, openCB, errorCB);
I suspect the reason the error is happening is because SQLite expects the existence of a database before you can actually open it. However, I do not see any instructions in the link above on how to create a database with react-native-sqlite-storage, so I'm not sure if my assumption is correct. Additionally, I assume I'd need to have a table for Employees, but again, the link above didn't explicitly state examples on how to create one. SO I don't know if my assumption is correct.
So how do I get SQLite.openDatabase() command to work?
More information
I deleted my project. Then I tried to re-install everything again, this time closely following the installation instructions for sqlite storage for android as mentioned on the andpor's github instructions (ie, modifying gradle files, updating MainApplication class etc...). Once I did that, running the command react-native run-android from the CLI causes this build error:
ERROR EPERM: operation not permitted, lstat 'C:\Users\John
Lai\Projects\ReactNative\myapp\android\app\build\intermediates\exploded-aar\myapp\realm\unspecified\jars\classes.jar'
{"errno":-4048,"code":"EPERM","syscall":"lstat","path":"C:\Users\John
Lai\Projects\ReactNative\myapp\android\app\build\intermediates\exploded-aar\myapp\realm\unspecified\jars\classes.jar"}
Error: EPERM: operation not permitted, lstat 'C:\Users\John
Lai\Projects\ReactNative\myapp\android\app\build\intermediates\exploded-aar\myapp\realm\unspecified\jars\classes.jar'
at Error (native)
I tried running this command as a regular user and as an administrator, and still the same issue.
More Information 2
I deleted my project. Then I did npm install for all my projects. Then I tried the commands rnpm link and react-native link react-native-sqlite-storage, both of which gave this error:
ERR! It seems something went wrong while linking. Error: spawn UNKNOWN
Please file an issue here: https://github.com/rnpm/rnpm/issues
So now the project won't even build. Any ideas?

Answer 1

the problem is the library is not linked
to link they suggest two ways
with pod (advanced)
with rnpm link (easy) but this command is deprecated
so to link the library you should use the
react-native link react-native-sqlite-storage
this command is equal to rnpm link but not deprecated
if automatic build failing try with manual linking for iOS manually linking ios and android manually linking android

Answer 2

lstat command error is generating on windows due to permission issues or npm version issues.
You can do 2 things to pass this.
1.Open terminal in admin mode .
2.upgrade/degrade npm version
For plugin installation, configure manually

Answer 3

You need change MainApplication.java with:
import org.pgsqlite.SQLitePluginPackage;
and
in getPackages:
new SQLitePluginPackage()