change drop to check if table exists

Author: Georg Traar

src/StatementGenerator.ts

@@ -60,7 +60,7 @@ export class StatementGenerator {
   }
 
   public static dropTable(tableName: string): string {
-    return `DROP TABLE ${this.quoteIdentifier(tableName)};`;
+    return `DROP TABLE IF EXISTS ${this.quoteIdentifier(tableName)};`;
   }
 
   public static insert(tableName: string, keys: string[], primaryKeys: string[] | null): string {

tests/StatementGenerator.test.ts

@@ -106,7 +106,7 @@ describe('StatementGenerator SQL Generation', () => {
   // Maintenance commands (DROP, REFRESH)
   it('should generate a DROP TABLE query', () => {
     const tableName = 'my_table';
-    expect(StatementGenerator.dropTable(tableName)).toBe(`DROP TABLE "my_table";`);
+    expect(StatementGenerator.dropTable(tableName)).toBe(`DROP TABLE IF EXISTS "my_table";`);
   });
 
   it('should generate a REFRESH query', () => {