Add index on foreign key column if parent exists to speed up queries (#356)

* add index on foreign key column if parent exists to speed up queries

* Updated release notes

Author: ohecker

core/src/main/java/com/devonfw/tools/solicitor/writer/ResultDatabaseFactory.java

@@ -82,6 +82,15 @@ private void createTable(AbstractModelObject modelObject) {
     String sql = sb.toString();
     this.jdbcTemplate.execute(sql);
 
+    // add index on foreign key column if parent exists to speed up queries
+    if (modelObject.getParent() != null) {
+      sb = new StringBuilder();
+      sb.append("CREATE INDEX IDX_").append(name).append("_PARENT ON ").append(name).append(" (PARENT_").append(name)
+          .append(");");
+      sql = sb.toString();
+      this.jdbcTemplate.execute(sql);
+    }
+
   }
 
   /**

documentation/master-solicitor.asciidoc

@@ -2026,7 +2026,8 @@ Spring beans implementing this interface will be called at certain points in the
 
 [appendix]
 == Release Notes
-Changes in 1.48.0::
+Changes in 1.47.1::
+* https://github.com/devonfw/solicitor/pull/356: Fixed performance issue by adding indexes for SQL database tables used for reporting.
 
 Changes in 1.47.0::
 * https://github.com/devonfw/solicitor/issues/348: Support worksheet protection in reports generated by the `ExcelWriter`. See <<Excel sheet protection against unwanted manual changes>>.