Dfrnhjy

i'm doing crud module for children and parent table. Can anyone suggest how to get the data from parent table.
Many thanks
here are may table

namespace ThuyNTCrudSetup;
use MagentoFrameworkDBDdlTable;
use MagentoFrameworkDBAdapterAdapterInterface;
use MagentoFrameworkSetupInstallSchemaInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoFrameworkSetupSchemaSetupInterface;

class InstallSchema implements InstallSchemaInterface

public function install(SchemaSetupInterface $setup, ModuleContextInterface $context)


 $installer = $setup;
 $installer->startSetup();

//
$table = $installer->getConnection()
->newTable($installer->getTable('crud_news_post'));
$table->addColumn(
'entity_id',
Table::TYPE_INTEGER,
null,
[
'identity' => true,
'unsigned' => true,
'nullable' => false,
'primary' => true
],
'Post ID'
)
->addColumn(
'authorpost_id',
Table::TYPE_INTEGER,
null,
[
'unsigned' => true,

 ],
 'Post Author ID'
 )
 ->addColumn(
 'title',
 Table::TYPE_TEXT,
 255,
 ['nullable' => false,],
 'Post Title'
 )
 ->addColumn(
 'url_key',
 Table::TYPE_TEXT,
 255,
 [],
 'Post Url Key'
 )
 ->addColumn(
 'post_content',
 Table::TYPE_TEXT,
 '64k',
 [],
 'Post Content'
 )
 ->addColumn(
 'type',
 Table::TYPE_TEXT,
 '64k',
 [],
 'Post Type'
 )
 ->addColumn(
 'is_active',
 Table::TYPE_INTEGER,
 null,
 [
 'nullable' => false,
 'default' => '1',
 ],
 'Is Author Active'
 )
 ->addColumn(
 'updated_at',
 Table::TYPE_TIMESTAMP,
 null,
 [],
 'Update at'
 )
 ->addColumn(
 'created_at',
 Table::TYPE_TIMESTAMP,
 null,
 [],
 'Creation Time'
 )->addForeignKey(
 $installer->getFkName('crud_news_post', 'authorpost_id', 'crud_news_author', 'author_id'),
 'authorpost_id',
 $installer->getTable('crud_news_author'),
 'author_id',
 Table::ACTION_CASCADE)
 ->setComment('News posts');
 // $installer->getConnection()->createTable($table);

// $installer->getConnection()->addIndex(
// $installer->getTable('crud_news_post'),
// $setup->getIdxName(
// $installer->getTable('crud_news_post'),
// ['name', 'url_key', 'post_content'],
// AdapterInterface::INDEX_TYPE_FULLTEXT
// ),
// [
// 'name',
//
// 'url_key',
// 'post_content',
//
// ],
// AdapterInterface::INDEX_TYPE_FULLTEXT
// );
$installer->getConnection()->createTable($table);

 $table = $installer->getConnection()
 ->newTable($installer->getTable('crud_news_author'));
 $table->addColumn(
 'author_id',
 Table::TYPE_INTEGER,
 null,
 [
 'unsigned' => true,
 "nullable"=>false,
 'primary' =>true,

 ],
 'Author ID'
 )
 ->addColumn(
 'author_name',
 Table::TYPE_TEXT,
 255,
 ['nullable' => false],

 'Author Name'
 )

// ->addIndex(
// $installer->getIdxName('crud_news_author', ['author_name']),
// ['author_name']
// )

 ->setComment('Author To Link Table');
 $installer->getConnection()->createTable($table);
 $installer->endSetup();