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Informations about the package dbcopy

dbcopy

dbcopy is a database copy- and migration tool. It is used by the Volkszaehler project.

Setup

dbcopy is configured via a dbcopy.json config file. dbcopy will look for this file in the following places if not specified using the --config option:

The config file has the following structure:

The tables section is optional. If not configured, dbcopy will auto-discover all tables in the source schema.

Command line syntax

Create command

The create command will copy the database schema of the source database connection to the target database. If database drivers (e.g. MySQL and SQlite) differ, the schema definition will be translated for the target platform. Limits of the underlying Doctrine/DBAL libraries apply.

Clear command

The clear command clears all tables in the target schema by TRUNCATING them. With the --drop option the tables are DROPPed altogether.

Drop command

Opposed to clear, the drop command DROPs the entire target schema if the database platforms supports it. If e.g. SQlite is used, the SQlite database file is not deleted.

Backup command

backup is the core routine of dbcopy. backup executes the following steps:

  1. Validate source connection is working and source schema exists, same for target connection and schema.
  2. Obtain list of tables- either from config file or by auto-discovering table of the source schema.
  3. Drop foreign keys on the identified tables in the target schema. This is necessary to allow copying of data without violating referential integrity.
  4. Copy data table by table according to configured copy mode.
  5. Re-apply foreign keys on the target schema (Note: currently not implemented for performance reasons.

Influx command

The influx command can copy data from the Volkszaehler data table into an InfluxDB measurement. This can be helpful for using Grafana or Chronograf with Volkszaehler.

With this command, the table configuration is ignored and only the data table transferred, including additional entity attributes.

Limitations

dbcopy does not support triggers and stored procedures. No support is planned.

All versions of dbcopy with dependencies

PHP Build Version
Package Version
Requires doctrine/dbal Version ^2.5|^3.0
symfony/console Version ^4.0|^5.0
influxdb/influxdb-php Version ^1.14
symfony/yaml Version ^4.|^5.0
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