[CM-2448] Crash : Table already exist | Android SDK (#628)

* added a check to skip existing table

* refactored the tableExist code

Author: KommunicateDeveloper

kommunicate/src/main/java/io/kommunicate/database/DatabaseMigrationHelper.kt

@@ -11,6 +11,14 @@ import kotlin.Throws
 object DatabaseMigrationHelper {
     private const val TEMP_ENCRYPTED_DB_NAME = "temp_encrypted.db"
 
+    // Check if table exists in destination DB
+    private fun tableExists(db: SQLiteDatabase, tableName: String): Boolean {
+        return db.rawQuery(
+            "SELECT 1 FROM sqlite_master WHERE type='table' AND name=? LIMIT 1",
+            arrayOf(tableName)
+        ).use { cursor -> cursor.moveToFirst() }
+    }
+
     @JvmStatic
     @Throws(Exception::class)
     fun migrateDatabase(context: Context, dbName: String) {
@@ -83,6 +91,12 @@ object DatabaseMigrationHelper {
                     continue
                 }
 
+                // Verifies if table exist
+                if (tableExists(destinationDb, tableName)) {
+                    println("Table $tableName already exists in destination DB, skipping creation.")
+                    continue
+                }
+
                 // Copy table schema
                 val createTableSql = getTableCreateSql(sourceDb, tableName)
                 destinationDb.execSQL(createTableSql)