hackolade · serhii-filonenko · Aug 12, 2026 · Aug 11, 2026
diff --git a/forward_engineering/alterScript/alterScriptFromDeltaHelper.js b/forward_engineering/alterScript/alterScriptFromDeltaHelper.js
@@ -52,27 +52,17 @@ const getSectionItems = section => ({
 });
 
 /**
- * Build the container statements. Schemas can only be dropped once every table they hold is gone, so the deleted
- * containers are reported separately and applied last.
+ * Build SET SCHEMA statements for added containers. Deleted and modified schemas do not produce schema-level DDL in Db2
+ * for z/OS.
  *
  * @param {{ collection: DeltaModel; app: App }} params Delta model and app instance.
- * @returns {{ deletedContainersScriptDtos: AlterScriptDto[]; upsertedContainersScriptDtos: AlterScriptDto[] }}
- *   Container alter script DTOs.
+ * @returns {AlterScriptDto[]} Container alter script DTOs.
  */
 const getAlterContainersScriptDtos = ({ collection, app }) => {
-	const { added, deleted, modified } = getSectionItems(collection.properties?.containers);
-	const { getAddContainerScriptDto, getDeleteContainerScriptDto, getModifyContainerScriptDto } =
-		getContainersScripts(app);
+	const { added } = getSectionItems(collection.properties?.containers);
+	const { getAddContainerScriptDto } = getContainersScripts(app);
 
-	return {
-		deletedContainersScriptDtos: deleted
-			.map(container => getDeleteContainerScriptDto(container))
-			.filter(scriptDto => scriptDto !== undefined),
-		upsertedContainersScriptDtos: [
-			...added.map(container => getAddContainerScriptDto(container)),
-			...modified.flatMap(container => getModifyContainerScriptDto(container)),
-		].filter(scriptDto => scriptDto !== undefined),
-	};
+	return added.map(container => getAddContainerScriptDto(container)).filter(scriptDto => scriptDto !== undefined);
 };
 
 /**
@@ -312,21 +302,20 @@ const getAlterScriptDtos = (data, app) => {
 		.filter(id => id !== undefined);
 	const relatedSchemas = buildRelatedSchemas(getSectionItems(collection.properties?.entities));
 
-	const { deletedContainersScriptDtos, upsertedContainersScriptDtos } = getAlterContainersScriptDtos({
+	const containerScriptDtos = getAlterContainersScriptDtos({
 		collection,
 		app,
 	});
 	const { deletedTypesScriptDtos, upsertedTypesScriptDtos } = getAlterTypesScriptDtos({ collection, app });
 
 	return [
-		...upsertedContainersScriptDtos,
+		...containerScriptDtos,
 		...upsertedTypesScriptDtos,
 		...getAlterCollectionScriptDtos({ collection, app, inlineDeltaRelationships, relatedSchemas }),
 		...getAlterVersioningScriptDtos({ collection, relatedSchemas }),
 		...getAlterRelationshipsScriptDtos({ collection, ignoreRelationshipIDs }),
 		...getAlterViewScriptDtos({ collection, app }),
 		...deletedTypesScriptDtos,
-		...deletedContainersScriptDtos,
 	]
 		.map(dto => prettifyAlterScriptDto(dto))
 		.filter(dto => dto !== undefined);

diff --git a/forward_engineering/alterScript/alterScriptHelpers/alterContainerHelper.js b/forward_engineering/alterScript/alterScriptHelpers/alterContainerHelper.js
@@ -10,60 +10,28 @@
  */
 
 const { createAlterScriptDto } = require('../dto/alterScriptDto');
-const { wrapInQuotes } = require('../../utils/general');
-const { getModifiedCommentOnSchemaScriptDtos } = require('./containerHelpers/commentsHelper');
 
 /**
- * Build the CREATE SCHEMA statement for an added container.
+ * Build the SET SCHEMA statement for an added container.
  *
  * @param {DdlProvider} ddlProvider DDL provider.
  * @returns {(containerData: AlterContainer) => AlterScriptDto | undefined} Add container script builder.
  */
 const getAddContainerScriptDto = ddlProvider => containerData => {
 	const script = ddlProvider.createSchema({
 		schemaName: containerData.role.name,
-		description: containerData.role.description,
 		isActivated: containerData.role.isActivated,
 	});
 
 	return createAlterScriptDto([script], true, false);
 };
 
-/**
- * Build the DROP SCHEMA statement for a deleted container.
- *
- * @param {DdlProvider} ddlProvider DDL provider.
- * @returns {(containerData: AlterContainer) => AlterScriptDto | undefined} Delete container script builder.
- */
-const getDeleteContainerScriptDto = ddlProvider => containerData => {
-	const script = ddlProvider.dropSchema({ name: containerData.role.name });
-
-	return createAlterScriptDto([script], true, true);
-};
-
-/**
- * Build the statements for a modified container.
- *
- * @returns {(containerData: AlterContainer) => AlterScriptDto[]} Modify container script builder.
- */
-const getModifyContainerScriptDto = () => containerData => {
-	const commentScriptDto = getModifiedCommentOnSchemaScriptDtos({
-		schemaName: wrapInQuotes(containerData.role.name),
-		compMod: containerData.role.compMod ?? {},
-		isActivated: containerData.isActivated !== false,
-	});
-
-	return commentScriptDto ? [commentScriptDto] : [];
-};
-
 /**
  * Build the container-level script builders bound to a DDL provider.
  *
  * @param {App} app App instance.
  * @returns {{
  * 	getAddContainerScriptDto: (containerData: AlterContainer) => AlterScriptDto | undefined;
- * 	getDeleteContainerScriptDto: (containerData: AlterContainer) => AlterScriptDto | undefined;
- * 	getModifyContainerScriptDto: (containerData: AlterContainer) => AlterScriptDto[];
  * }}
  *   Container script builders.
  */
@@ -72,8 +40,6 @@ const getContainersScripts = app => {
 
 	return {
 		getAddContainerScriptDto: getAddContainerScriptDto(ddlProvider),
-		getDeleteContainerScriptDto: getDeleteContainerScriptDto(ddlProvider),
-		getModifyContainerScriptDto: getModifyContainerScriptDto(),
 	};
 };
 

diff --git a/forward_engineering/alterScript/alterScriptHelpers/containerHelpers/commentsHelper.js b/forward_engineering/alterScript/alterScriptHelpers/containerHelpers/commentsHelper.js
diff --git a/forward_engineering/ddlProvider/ddlHelpers/comment/commentHelper.js b/forward_engineering/ddlProvider/ddlHelpers/comment/commentHelper.js
@@ -13,7 +13,6 @@ const { wrapInQuotes, commentIfDeactivated, wrapInSingleQuotes } = require('../.
 
 /** @enum {string} */
 const OBJECT_TYPE = {
-	schema: 'SCHEMA',
 	column: 'COLUMN',
 	table: 'TABLE',
 	index: 'INDEX',
@@ -146,21 +145,6 @@ const dropTypeCommentStatement = ({ typeName }) => {
 	});
 };
 
-/**
- * Build a schema comment statement.
- *
- * @param {{ schemaName: string; description?: string }} params Schema comment params.
- * @returns {string} Comment statement.
- */
-const getSchemaCommentStatement = ({ schemaName, description }) => {
-	return getCommentStatement({
-		objectName: schemaName,
-		objectType: OBJECT_TYPE.schema,
-		description,
-		mode: COMMENT_MODE.set,
-	});
-};
-
 /**
  * Build column comments for a table.
  *
@@ -183,20 +167,6 @@ const getColumnComments = ({ tableName, columnDefinitions }) => {
 		.join('\n');
 };
 
-/**
- * Build the statement removing a schema comment.
- *
- * @param {{ schemaName: string }} params Schema name.
- * @returns {string} Comment statement.
- */
-const dropSchemaCommentStatement = ({ schemaName }) =>
-	getCommentStatement({
-		objectName: schemaName,
-		objectType: OBJECT_TYPE.schema,
-		description: '',
-		mode: COMMENT_MODE.remove,
-	});
-
 /**
  * Build the statement removing a table comment.
  *
@@ -227,14 +197,12 @@ const dropTableColumnCommentStatement = ({ tableName, columnName }) =>
 
 module.exports = {
 	getColumnCommentStatement,
-	getSchemaCommentStatement,
 	getTableCommentStatement,
 	getIndexCommentStatement,
 	dropIndexCommentStatement,
 	getTypeCommentStatement,
 	dropTypeCommentStatement,
 	getColumnComments,
-	dropSchemaCommentStatement,
 	dropTableCommentStatement,
 	dropTableColumnCommentStatement,
 };
diff --git a/forward_engineering/ddlProvider/ddlProvider.js b/forward_engineering/ddlProvider/ddlProvider.js
@@ -5,7 +5,6 @@
  *   CreateSchemaParams,
  *   CreateTableParams,
  *   DdlProvider,
- *   DropSchemaParams,
  *   ForeignKeyInput,
  *   ForeignKeyStatement,
  *   HydrateColumnParams,
@@ -48,7 +47,6 @@ const { getColumnConstraints } = require('./ddlHelpers/columnDefinition/getColum
 const {
 	getTableCommentStatement,
 	getColumnComments,
-	getSchemaCommentStatement,
 	getIndexCommentStatement,
 	getTypeCommentStatement,
 } = require('./ddlHelpers/comment/commentHelper.js');
@@ -130,56 +128,38 @@ const hydrateSchema = containerData => ({
 });
 
 /**
- * Create schema DDL.
+ * Set the current schema.
  *
  * @param {CreateSchemaParams} params Schema params.
- * @returns {string} Schema DDL.
+ * @returns {string} SET SCHEMA DDL.
  */
-const createSchema = ({ schemaName, description, isActivated = true }) => {
+const createSchema = ({ schemaName, isActivated = true }) => {
 	const wrappedSchemaName = wrapInQuotes(schemaName);
-	const schemaStatement = assignTemplates({
-		template: templates.createSchema,
+	const setSchemaStatement = assignTemplates({
+		template: templates.setSchema,
 		templateData: {
 			schemaName: wrappedSchemaName,
 		},
 	});
 
-	const comment = getSchemaCommentStatement({ schemaName: wrappedSchemaName, description });
-	const commentStatement = comment ? '\n' + comment + '\n' : '\n';
-
-	return commentDeactivatedStatement(schemaStatement + commentStatement, { isActivated });
+	return commentDeactivatedStatement(setSchemaStatement + '\n', { isActivated });
 };
 
 /**
- * Drop schema DDL.
+ * Return no DDL for dropping a schema. Db2 for z/OS schemas are qualifiers rather than standalone objects that can be
+ * dropped. This method remains in the provider for framework compatibility.
  *
- * @param {DropSchemaParams} params Schema params.
- * @returns {string} Drop schema DDL.
+ * @returns {string} Empty DDL.
  */
-const dropSchema = ({ name, isActivated = true }) => {
-	const dropSchemaStatement = assignTemplates({
-		template: templates.dropSchema,
-		templateData: {
-			schemaName: wrapInQuotes(name),
-		},
-	});
-
-	return commentDeactivatedStatement(dropSchemaStatement, { isActivated });
-};
+const dropSchema = () => '';
 
 /**
- * Alter schema DDL.
+ * Return no DDL for altering a schema. Db2 for z/OS does not support ALTER SCHEMA. This method remains in the provider
+ * for framework compatibility.
  *
- * @param {string} schemaName Schema name.
- * @returns {string} Alter schema DDL.
+ * @returns {string} Empty DDL.
  */
-const alterSchema = schemaName =>
-	assignTemplates({
-		template: templates.alterSchema,
-		templateData: {
-			schemaName: wrapInQuotes(schemaName),
-		},
-	});
+const alterSchema = () => '';
 
 /**
  * Create distinct type DDL.

diff --git a/forward_engineering/ddlProvider/templates.js b/forward_engineering/ddlProvider/templates.js
@@ -1,9 +1,5 @@
 module.exports = {
-	createSchema: 'CREATE SCHEMA ${schemaName};',
-
-	dropSchema: 'DROP SCHEMA ${schemaName} RESTRICT;',
-
-	alterSchema: 'ALTER SCHEMA ${schemaName};',
+	setSchema: 'SET SCHEMA = ${schemaName};',
 
 	createType: 'CREATE TYPE ${name} AS ${sourceType};',
 

diff --git a/properties_pane/container_level/containerLevelConfig.json b/properties_pane/container_level/containerLevelConfig.json
@@ -126,7 +126,7 @@ making sure that you maintain a proper JSON format.
 				"propertyTooltip": "",
 				"structure": [
 					{
-						"propertyName": "Before CREATE SCHEMA",
+						"propertyName": "Before SET SCHEMA",
 						"propertyKeyword": "beforeCreateContainer",
 						"propertyType": "details",
 						"markdown": false,
@@ -137,7 +137,7 @@ making sure that you maintain a proper JSON format.
 						}
 					},
 					{
-						"propertyName": "After CREATE SCHEMA",
+						"propertyName": "After SET SCHEMA",
 						"propertyKeyword": "afterCreateContainer",
 						"propertyType": "details",
 						"markdown": false,

diff --git a/properties_pane/model_level/modelLevelConfig.json b/properties_pane/model_level/modelLevelConfig.json
@@ -102,7 +102,7 @@ making sure that you maintain a proper JSON format.
 						}
 					},
 					{
-						"propertyName": "Before each CREATE SCHEMA",
+						"propertyName": "Before each SET SCHEMA",
 						"propertyKeyword": "beforeCreateContainer",
 						"propertyType": "details",
 						"markdown": false,
@@ -113,7 +113,7 @@ making sure that you maintain a proper JSON format.
 						}
 					},
 					{
-						"propertyName": "After each CREATE SCHEMA",
+						"propertyName": "After each SET SCHEMA",
 						"propertyKeyword": "afterCreateContainer",
 						"propertyType": "details",
 						"markdown": false,