You could create more or less schemas, it is all up to you and how you want to To create these schemas we use theĬreate schema forum_example create schema forum_example_private We are going to create two schemas:įorum_example, and forum_example_private. Might only realistically happen in development), you can easily query theĭatabases of the different apps.
This way if you are working on multiple apps in the same database (this
You can name your schema anything, we recommend naming your schema after yourĪpp. Schema is essentially a namespace, it allows you to create tables with the same Quick Start Guide to get PostGraphile up andĪll of our database objects will go into one or two custom Postgres schemas. If you haven't installed PostGraphile already, you can follow our Should be useful for anyone designing a Postgres schema. While we willĭiscuss how you can use the schema we create with PostGraphile, this article In this tutorial we will walk through the Postgres schema design for a forumĪpplication with users who can login and write forum posts. Packaging the repeatable work in one open source project that encourages PostGraphile aims to make developers more efficient and their APIs faster by Interface that is slower than if the logic was implemented in Postgres itself. Inefficient way to spend developer resources, but may also result in an This reimplementation of features that come with Postgres is not just an Or perhaps developers may rewrite basic insertįunctions with some extra app logic where that too may be handled in the Often developers may find themselves re-implementing authentication andĪuthorization in their apps, when Postgres comes with application level securityįeatures out of the box. Leverage the features in Postgres to completely express their application However, most developers do not know the extent to which they can Value of the lineage list.The Postgres database is rich with features well beyond that of any otherĭatabase. The Parent_State_ID column is a convenience for searching, and is redundant with the last Once a state has been closed, the CLOSE_TIME value If a state is currently OPEN, that is, the owner can make changes within the state, the CLOSE_TIME will be NULL. References the state's lineage stored in the STATE_LINEAGES The date/time that this state was created The STATES table maintains the following properties: System TableĪ unique integer ID for this state, assigned by ArcSDE When a state is created, a state ID is assigned and a record is added to this Using the information in this table joined with STATE_LINEAGES, the entire versioned database history can be reconstructed. For each state, the creation time, closing time, parent, and owner are maintained. Time, thus maintaining a list of all database states. The STATES table accounts for all of the states that have been created over The date/time that this version was created The ID of Version which is the Parent of this version. The name of the owner of the Parent Version The name of this version's Parent version SE_STRING_TYPE(64 in SQL Server 65 in all other DBMSs)Īn optional text description of the version The ID of the database state to which this version points Public or if it is privately accessed by the owner Specifies whether the version is available to the insert into versions value ('DEFAULT','SDE',1,1,0,'Instance default version.',null,null,SYSDATE) The default version, you can replace it with the following SQL insert statement. PUBLIC access, any user can change the state of the default.ĪrcGIS requires the presence of the default version. Since the default version has been granted The initial state_id will be set to 0, and the description string will read This default version will be named DEFAULT, will be owned by theĪdministrator, and granted PUBLIC access. When the VERSIONS table is first created by ArcSDE, a default version will be inserted These versions are used to access specific database states by the application. This table defines the different versions that the database contains and providesĪ list of available versions to be presented to the user. Each version is identified by name, with an owner, description, and associated database
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