Do Not Show Relations To Invisible Tables In SchemaCrawler Diagram
Introduction
As a database administrator or developer, understanding the relationships between tables in a database is crucial for effective data management and analysis. SchemaCrawler is a powerful tool that provides a visual representation of database schema, making it easier to comprehend complex relationships between tables. However, in some cases, you might encounter invisible tables in your database, which can make it challenging to navigate the SchemaCrawler diagram. In this article, we will explore how to exclude relations to invisible tables in SchemaCrawler diagram.
Invisible Tables in Database
Invisible tables are tables that are not visible in the database schema, but they still exist in the database. These tables can be created using the CREATE TABLE statement with the INVISIBLE keyword. Invisible tables are not included in the database schema, and they do not appear in the information_schema.tables view. However, they can still be accessed using the SELECT statement.
Problem with Invisible Tables in SchemaCrawler
When you run SchemaCrawler on a database that contains invisible tables, it may include these tables in the diagram, making it difficult to navigate. This can be particularly problematic if you have a large number of invisible tables, as it can clutter the diagram and make it harder to understand the relationships between visible tables.
Solution: Exclude Relations to Invisible Tables
To exclude relations to invisible tables in SchemaCrawler diagram, you can use the --exclude-invisible-tables option when running SchemaCrawler. This option tells SchemaCrawler to ignore invisible tables and their relationships.
Command with Exclude Invisible Tables Option
Here is an example of how to use the --exclude-invisible-tables option with your command:
schemacrawler.cmd -server=postgresql -host=hostname -port=5432 -database=db -schemas=public -user=user -password=***-sslmode=require -exclude-invisible-tables -...
By adding the --exclude-invisible-tables option, you can exclude relations to invisible tables in the SchemaCrawler diagram, making it easier to navigate and understand the relationships between visible tables.
Additional Options for Customization
In addition to the --exclude-invisible-tables option, SchemaCrawler provides several other options that can help you customize the diagram and exclude specific tables or relationships. Some of these options include:
--exclude-tables: This option allows you to specify a list of tables to exclude from the diagram.--exclude-relationships: This option allows you to specify a list of relationships to exclude from the diagram.--include-tables: This option allows you to specify a list of tables to include in the diagram, even if they are invisible.
Example with Exclude Tables Option
Here is an example of how to use the --exclude-tables option to exclude specific tables from the diagram:
schemacrawler.cmd -server=postgresql -host=hostname -port=5432 -database=db -schemas=public -user=user -password=***-sslmode=require -exclude-invisible-tables -exclude-tables=table1,table2,table3 -...
By using these options, you can customize the SchemaCrawler diagram to exclude specific tables or relationships, it easier to navigate and understand the relationships between visible tables.
Conclusion
In this article, we explored how to exclude relations to invisible tables in SchemaCrawler diagram. We discussed the problem of invisible tables in database and how they can clutter the SchemaCrawler diagram. We also provided solutions using the --exclude-invisible-tables option and other customization options. By using these options, you can create a clear and concise SchemaCrawler diagram that helps you understand the relationships between visible tables in your database.
Additional Resources
For more information on SchemaCrawler and its options, please refer to the official SchemaCrawler documentation. Additionally, you can explore the SchemaCrawler community forum for more tips and best practices on using SchemaCrawler to manage your database schema.
SchemaCrawler Documentation
SchemaCrawler Community Forum
Introduction
In our previous article, we explored how to exclude relations to invisible tables in SchemaCrawler diagram. In this article, we will provide a Q&A section to address common questions and concerns related to excluding relations to invisible tables in SchemaCrawler.
Q&A
Q: What are invisible tables in a database?
A: Invisible tables are tables that are not visible in the database schema, but they still exist in the database. These tables can be created using the CREATE TABLE statement with the INVISIBLE keyword.
Q: Why do invisible tables appear in the SchemaCrawler diagram?
A: Invisible tables can appear in the SchemaCrawler diagram because SchemaCrawler includes all tables in the database, regardless of whether they are visible or invisible. This can clutter the diagram and make it harder to understand the relationships between visible tables.
Q: How do I exclude relations to invisible tables in SchemaCrawler?
A: To exclude relations to invisible tables in SchemaCrawler, you can use the --exclude-invisible-tables option when running SchemaCrawler. This option tells SchemaCrawler to ignore invisible tables and their relationships.
Q: Can I exclude specific tables from the SchemaCrawler diagram?
A: Yes, you can exclude specific tables from the SchemaCrawler diagram using the --exclude-tables option. This option allows you to specify a list of tables to exclude from the diagram.
Q: Can I include specific tables in the SchemaCrawler diagram, even if they are invisible?
A: Yes, you can include specific tables in the SchemaCrawler diagram, even if they are invisible, using the --include-tables option. This option allows you to specify a list of tables to include in the diagram, even if they are invisible.
Q: How do I customize the SchemaCrawler diagram to exclude specific relationships?
A: You can customize the SchemaCrawler diagram to exclude specific relationships using the --exclude-relationships option. This option allows you to specify a list of relationships to exclude from the diagram.
Q: Can I use multiple options to customize the SchemaCrawler diagram?
A: Yes, you can use multiple options to customize the SchemaCrawler diagram. For example, you can use the --exclude-invisible-tables and --exclude-tables options together to exclude both invisible tables and specific tables from the diagram.
Q: Where can I find more information on SchemaCrawler options and customization?
A: You can find more information on SchemaCrawler options and customization in the official SchemaCrawler documentation and community forum.
Conclusion
In this Q&A article, we addressed common questions and concerns related to excluding relations to invisible tables in SchemaCrawler. We provided information on how to exclude invisible tables, specific tables, and relationships from the SchemaCrawler diagram. We also provided resources for further information on SchemaCrawler options and customization.
Additional Resources
For more information on SchemaCrawler and its options, please refer to the official SchemaCrawler documentation and community forum.