I am looking to drop a table in MySQL using Liquibase only if the table exists.
I am not able to figure out how to check if a table exists in Liquibase.
You should use
<changeSet author="liquibase-docs" id="dropTable-example">
<preConditions onFail="MARK_RAN"><tableExists schemaName="schemaName" tableName="tableName"/></preConditions>
<dropTable cascadeConstraints="true"
catalogName="cat"
schemaName="public"
tableName="person"/>
</changeSet>
Also, you can check this link for more <preConditions>
options: http://www.liquibase.org/documentation/preconditions.html
Below is the Groovy version of dropping the table with Liquibase using preConditions
chack that the table exists.
changeSet(author: "author", id: "some_id_value") {
preConditions(onFail: "MARK_RAN"){
tableExists(tableName: "table_name")
}
dropTable(tableName: "table_name")
}
Here is a YAML snippet for dropping a table if exists
- changeSet:
id: drop-my-table-if-exists
author: the-author
comment: drop my_table if exists
preConditions:
- onFail: MARK_RAN
- tableExists:
tableName: my_table
changes:
- dropTable:
tableName: my_table
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