org.apache.cayenne.access

## Class DbGenerator

- java.lang.Object
- - org.apache.cayenne.access.DbGenerator

-     public class DbGenerator
      extends Object

  Utility class that generates database schema based on Cayenne mapping. It is a logical counterpart of DbLoader class.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected DbAdapter` | `adapter`
    `protected Map<String,List<String>>` | `createConstraints`
    `protected List<String>` | `createPK`
    `protected Map<String,String>` | `createTables`
    `protected List<DbEntity>` | `dbEntitiesInInsertOrder` Contains all DbEntities ordered considering their interdependencies.
    `protected List<DbEntity>` | `dbEntitiesRequiringAutoPK`
    `protected DataDomain` | `domain`
    `protected List<String>` | `dropPK`
    `protected Map<String,Collection<String>>` | `dropTables`
    `protected ValidationResult` | `failures`
    `protected JdbcEventLogger` | `jdbcEventLogger`
    `protected DataMap` | `map`
    `protected boolean` | `shouldCreateFKConstraints`
    `protected boolean` | `shouldCreatePKSupport`
    `protected boolean` | `shouldCreateTables`
    `protected boolean` | `shouldDropPKSupport`
    `protected boolean` | `shouldDropTables`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DbGenerator(DbAdapter adapter, DataMap map, Collection<DbEntity> excludedEntities, DataDomain domain, JdbcEventLogger logger)` Creates and initializes new DbGenerator instance.
    `DbGenerator(DbAdapter adapter, DataMap map, JdbcEventLogger logger)`
    `DbGenerator(DbAdapter adapter, DataMap map, JdbcEventLogger logger, Collection<DbEntity> excludedEntities)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `buildStatements()` Creates and stores internally a set of statements for database schema creation, ignoring configured schema creation preferences.
    `List<String>` | `configuredStatements()` Returns a list of all schema statements that should be executed with the current configuration.
    `List<String>` | `createConstraintsQueries(DbEntity table)` Creates FK and UNIQUE constraint statements for a given table.
    `DbAdapter` | `getAdapter()` Returns DbAdapter associated with this DbGenerator.
    `DataDomain` | `getDomain()` Returns a DataDomain used by the DbGenerator to detect cross-database relationships.
    `ValidationResult` | `getFailures()` Returns an object representing a collection of failures that occurred on the last "runGenerator" invocation, or null if there were no failures.
    `boolean` | `isEmpty(boolean respectConfiguredSettings)` Returns `true` if there is nothing to be done by this generator.
    `protected void` | `resetToDefaults()`
    `void` | `runGenerator(DataSource ds)` Executes a set of commands to drop/create database objects.
    `void` | `runGenerator(DataSourceInfo dsi)` Creates a temporary DataSource out of DataSourceInfo and invokes `public void runGenerator(DataSource ds)`.
    `protected boolean` | `safeExecute(Connection connection, String sql)` Builds and executes a SQL statement, catching and storing SQL exceptions resulting from invalid SQL.
    `void` | `setShouldCreateFKConstraints(boolean shouldCreateFKConstraints)`
    `void` | `setShouldCreatePKSupport(boolean shouldCreatePKSupport)`
    `void` | `setShouldCreateTables(boolean shouldCreateTables)`
    `void` | `setShouldDropPKSupport(boolean shouldDropPKSupport)`
    `void` | `setShouldDropTables(boolean shouldDropTables)`
    `boolean` | `shouldCreateFKConstraints()`
    `boolean` | `shouldCreatePKSupport()` Returns whether DbGenerator is configured to create primary key support for DataMap entities.
    `boolean` | `shouldCreateTables()` Returns whether DbGenerator is configured to create tables for DataMap entities.
    `boolean` | `shouldDropPKSupport()`
    `boolean` | `shouldDropTables()`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### adapter

          protected DbAdapter adapter

    - #### map

          protected DataMap map

    - #### domain

          protected DataDomain domain

    - #### jdbcEventLogger

          protected JdbcEventLogger jdbcEventLogger

    - #### dropTables

          protected Map<String,Collection<String>> dropTables

    - #### createTables

          protected Map<String,String> createTables

    - #### createConstraints

          protected Map<String,List<String>> createConstraints

    - #### createPK

          protected List<String> createPK

    - #### dropPK

          protected List<String> dropPK

    - #### dbEntitiesInInsertOrder

          protected List<DbEntity> dbEntitiesInInsertOrder

      Contains all DbEntities ordered considering their interdependencies. DerivedDbEntities are filtered out of this list.

    - #### dbEntitiesRequiringAutoPK

          protected List<DbEntity> dbEntitiesRequiringAutoPK

    - #### shouldDropTables

          protected boolean shouldDropTables

    - #### shouldCreateTables

          protected boolean shouldCreateTables

    - #### shouldDropPKSupport

          protected boolean shouldDropPKSupport

    - #### shouldCreatePKSupport

          protected boolean shouldCreatePKSupport

    - #### shouldCreateFKConstraints

          protected boolean shouldCreateFKConstraints

    - #### failures

          protected ValidationResult failures

  - ### Constructor Detail

    - #### DbGenerator

          public DbGenerator(DbAdapter adapter,
                             DataMap map,
                             JdbcEventLogger logger)

      Since:
        3.1

    - #### DbGenerator

          public DbGenerator(DbAdapter adapter,
                             DataMap map,
                             JdbcEventLogger logger,
                             Collection<DbEntity> excludedEntities)

      Since:
        3.1

    - #### DbGenerator

          public DbGenerator(DbAdapter adapter,
                             DataMap map,
                             Collection<DbEntity> excludedEntities,
                             DataDomain domain,
                             JdbcEventLogger logger)

      Creates and initializes new DbGenerator instance.
      Parameters:
        `adapter` - DbAdapter corresponding to the database
        `map` - DataMap whose entities will be used in schema generation
        `excludedEntities` - entities that should be ignored during schema generation
        `domain` - optional DataDomain used to detect cross-database relationships.
      Since:
        3.1

  - ### Method Detail

    - #### resetToDefaults

          protected void resetToDefaults()

    - #### buildStatements

          protected void buildStatements()

      Creates and stores internally a set of statements for database schema creation, ignoring configured schema creation preferences. Statements are NOT executed in this method.

    - #### isEmpty

          public boolean isEmpty(boolean respectConfiguredSettings)

      Returns `true` if there is nothing to be done by this generator. If `respectConfiguredSettings` is `true` , checks are done applying currently configured settings, otherwise check is done, assuming that all possible generated objects.

    - #### getAdapter

          public DbAdapter getAdapter()

      Returns DbAdapter associated with this DbGenerator.

    - #### configuredStatements

          public List<String> configuredStatements()

      Returns a list of all schema statements that should be executed with the current configuration.

    - #### runGenerator

          public void runGenerator(DataSourceInfo dsi)
                            throws Exception

      Creates a temporary DataSource out of DataSourceInfo and invokes `public void runGenerator(DataSource ds)`.
      Throws:
        `Exception`

    - #### runGenerator

          public void runGenerator(DataSource ds)
                            throws Exception

      Executes a set of commands to drop/create database objects. This is the main worker method of DbGenerator. Command set is built based on pre-configured generator settings.
      Throws:
        `Exception`

    - #### safeExecute

          protected boolean safeExecute(Connection connection,
                                        String sql)
                                 throws SQLException

      Builds and executes a SQL statement, catching and storing SQL exceptions resulting from invalid SQL. Only non-recoverable exceptions are rethrown.
      Throws:
        `SQLException`
      Since:
        1.1

    - #### createConstraintsQueries

          public List<String> createConstraintsQueries(DbEntity table)

      Creates FK and UNIQUE constraint statements for a given table.
      Since:
        3.0

    - #### getFailures

          public ValidationResult getFailures()

      Returns an object representing a collection of failures that occurred on the last "runGenerator" invocation, or null if there were no failures. Failures usually indicate problems with generated DDL (such as "create...", "drop...", etc.) and usually happen due to the DataMap being out of sync with the database.
      Since:
        1.1

    - #### shouldCreatePKSupport

          public boolean shouldCreatePKSupport()

      Returns whether DbGenerator is configured to create primary key support for DataMap entities.

    - #### shouldCreateTables

          public boolean shouldCreateTables()

      Returns whether DbGenerator is configured to create tables for DataMap entities.

    - #### shouldDropPKSupport

          public boolean shouldDropPKSupport()

    - #### shouldDropTables

          public boolean shouldDropTables()

    - #### shouldCreateFKConstraints

          public boolean shouldCreateFKConstraints()

    - #### setShouldCreatePKSupport

          public void setShouldCreatePKSupport(boolean shouldCreatePKSupport)

    - #### setShouldCreateTables

          public void setShouldCreateTables(boolean shouldCreateTables)

    - #### setShouldDropPKSupport

          public void setShouldDropPKSupport(boolean shouldDropPKSupport)

    - #### setShouldDropTables

          public void setShouldDropTables(boolean shouldDropTables)

    - #### setShouldCreateFKConstraints

          public void setShouldCreateFKConstraints(boolean shouldCreateFKConstraints)

    - #### getDomain

          public DataDomain getDomain()

      Returns a DataDomain used by the DbGenerator to detect cross-database relationships. By default DataDomain is null.
      Since:
        1.2

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