Package io.github.blyznytsiaorg.bibernate.ddl

Class DDLQueryCreator

java.lang.Object

io.github.blyznytsiaorg.bibernate.ddl.DDLQueryCreator

public class DDLQueryCreator
extends Object

The DDLQueryCreator class is responsible for creating Data Definition Language (DDL) queries based on the metadata of entities in the Bibernate framework. It generates queries for operations such as creating and dropping tables, indexes and sequences. Additionally, it handles the resolution of field mappings and the creation of queries based on entity metadata.

This class also provides methods for validating and creating DDL queries for various database operations.

The DDLQueryCreator class is designed to work in conjunction with other components of the Bibernate framework to facilitate database schema management and migration tasks.

Since:

1.0

Author:

Blyzhnytsia Team

See Also:

• EntityMetadataCollector
• EntityMetadata
• DDLFieldMetadataHolder
• OperationOrder
• FieldResolver

Field Summary

Fields

Modifier and Type	Field	Description
private final Map<Class<?>,EntityMetadata>	bibernateEntityMetadata
static final String	BRACKET
static final String	CREATE_INDEX
static final String	CREATE_TABLE
private final List<String>	createConstraints
private final List<String>	createIndexes
private final List<String>	createSequences
private final List<String>	createTables
private final Map<Integer,List<String>>	ddlMetadata
static final String	DELIMITER
static final String	DROP_TABLE
private final List<String>	dropConstraints
private final List<String>	dropSequences
private final List<String>	dropTables
private final List<FieldResolver>	fieldResolvers

Constructor Summary

Constructors

Constructor	Description
DDLQueryCreator()	Constructs a new DDLQueryCreator instance.

Method Summary

Modifier and Type	Method	Description
private void	checkIfColumnForIndexExists(EntityMetadata entityMetadata, String columnList)	Checks if the specified column exists in the entity metadata for creating an index.
private void	createIndexQuery(EntityMetadata entityMetadata)	Creates Data Definition Language (DDL) queries for creating indexes on the specified entity table.
void	createQueries()	Generates Data Definition Language (DDL) queries based on the metadata of Bibernate entities.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DROP_TABLE

public static final String DROP_TABLE

See Also:

• Constant Field Values

CREATE_INDEX

public static final String CREATE_INDEX

See Also:

• Constant Field Values

DELIMITER

public static final String DELIMITER

See Also:

• Constant Field Values

CREATE_TABLE

public static final String CREATE_TABLE

See Also:

• Constant Field Values

BRACKET

public static final String BRACKET

See Also:

• Constant Field Values

dropSequences

private final List<String> dropSequences

createSequences

private final List<String> createSequences

createTables

private final List<String> createTables

createIndexes

private final List<String> createIndexes

createConstraints

private final List<String> createConstraints

dropConstraints

private final List<String> dropConstraints

dropTables

private final List<String> dropTables

bibernateEntityMetadata

private final Map<Class<?>,EntityMetadata> bibernateEntityMetadata

ddlMetadata

private final Map<Integer,List<String>> ddlMetadata

fieldResolvers

private final List<FieldResolver> fieldResolvers

Constructor Details

DDLQueryCreator

public DDLQueryCreator()

Constructs a new DDLQueryCreator instance.

Initializes the DDL query metadata map and field resolvers list. Retrieves Bibernate entity metadata and sets up DDL metadata for various operations such as dropping constraints, tables and sequences, as well as creating sequences, tables, indexes and constraints. Finally, it invokes the createQueries() method to generate the DDL queries based on the entity metadata.

See Also:

• BibernateContextHolder
• OperationOrder

Method Details

createQueries

public void createQueries()

Generates Data Definition Language (DDL) queries based on the metadata of Bibernate entities.

Iterates over each Bibernate entity metadata and creates DDL queries for operations such as dropping tables, creating tables and creating indexes. For each entity, it creates DDL queries for its columns and resolves any associated field mappings using field resolvers.

The generated DDL queries are added to the respective lists in the DDL metadata map for further processing.

Since:

1.0

See Also:

• NoRelationFieldResolver
• ToOneRelationFieldResolver
• ManyToManyFieldResolver

createIndexQuery

private void createIndexQuery(EntityMetadata entityMetadata)

Creates Data Definition Language (DDL) queries for creating indexes on the specified entity table.

Parameters:

entityMetadata - the metadata of the entity for which indexes are created

checkIfColumnForIndexExists

private void checkIfColumnForIndexExists(EntityMetadata entityMetadata,
 String columnList)

Checks if the specified column exists in the entity metadata for creating an index.

Verifies whether the specified column exists in the entity metadata list of columns. If the column does not exist, it throws a MappingException indicating that the column does not exist for creating an index.

Parameters:

entityMetadata - the metadata of the entity

columnList - the list of columns for which the index is being created

Throws:

MappingException - if the specified column does not exist in the entity metadata