spotval.blogg.se - Postgresql current timestamp

Utcnow() returns a datetime object of the current time in the UTC timezone.

Using now() will cause templates to be refreshed at the start of every new minute.

You can also use: now().second, now().minute, now().hour, now().day, now().month, now().year, now().weekday() and now().isoweekday() and other datetime attributes and functions.

Now() returns a datetime object that represents the current time in your time zone. Now(), relative_time(), today_at(), and utcnow() are not supported in limited templates. This form of the expression short-circuits so if the platform is event the expression trigger.to_state.state will never be evaluated and won’t cause an error. Instead you have to do this if atform = 'event' else trigger.to_state.state. This won’t work because both expressions will be evaluated and one will fail since the field doesn’t exist. This means you cannot use this filter to prevent executing an expression which would result in an error.įor example, if you wanted to select a field from trigger in an automation based on the platform you might go to make this template: atform = 'event' | iif(, trigger.to_state.state). The if_true, if_false and if_none expressions will all be evaluated and the filter will simply return one of the resulting values. The immediate if filter does not short-circuit like you might expect with a typical conditional statement. The following example results in the number 20.001: The examples below show the output of a temperature sensor with state 20.001, unit ☌ and user configured presentation rounding set to 1 decimal. Script : msg_who_is_home : sequence : - service : notify.notify data : message : > To keep a clear overview, consider using YAML multiline strings to define your templates: Navigate to Developer Tools > Template, create your template in the Template editor and check the results on the right. The frontend has a template editor tool to help develop and debug templates. We will not go over the basics of the syntax, as Jinja2 does a great job of this in their templates documentation. Jinja2 supports a wide variety of operations:

This means that we are using their syntax and make some custom Home Assistant variables available to templates during rendering. Templating in Home Assistant is powered by the Jinja2 templating engine. Process incoming data from sources that provide raw data, like MQTT, rest sensor or the command_line sensor.Formatting outgoing messages in, for example, the notify platforms and Alexa integration.Templating is a powerful feature that allows you to control information going into and out of the system. Home Assistant architecture, especially states.This is an advanced feature of Home Assistant. You can also chain withKeyName() to override default key name that is generated from table and column names (result is identical to specifying second parameter to function foreign()).ĭeferrable foreign constraint is supported on Postgres and Oracle and can be set by chaining. You can also chain onDelete() and/or onUpdate() to set the reference option (RESTRICT, CASCADE, SET NULL, NO ACTION) for the operation. Table.foreign(columns, )Īdds a foreign key constraint to a table for an existing column using table.foreign(column).references(column) or multiple columns using table.foreign(columns).references(columns).inTable(table).Ī default key name using the columns is used unless foreignKeyName is specified. If you want to chain unique() while creating new column you can use unique foreign # In PostgreSQL, SQLite and MSSQL a partial unique index can be specified by setting a 'where' predicate.

In MSSQL and Postgres, you can set the useConstraint option to true to create a unique constraint instead of a unique index (defaults to false for MSSQL, true for Postgres without predicate, false for Postgres with predicate). Deferrable unique constraint are supported on Postgres and Oracle and can be set by passing deferrable option to options object. If you need to create a composite index, pass an array of column to columns. A default index name using the columns is used unless indexName is specified.

In MySQL, the storage engine index type may be 'btree' or 'hash' index types, more info in Index Options section. Table.increments(name, options=)Īdds an unique index to a table over the given columns. Renames a column from one name to another. dropSchemaIfExists ( 'public', true ) Schema Building # dropColumn #ĭrops a column, specified by the column's name dropColumns #ĭrops multiple columns, taking a variable number of column names. dropSchemaIfExists ( 'public' ) //drop schema if exists 'public' cascade