概念

CREATE (agent:`007`) RETURN agent;
UNWIND RANGE(1,6) AS i
WITH i CREATE (n:OtherAgents {idx: '00' + i})
RETURN n
;

MigrationsConfig configLookingAtDifferentPlaces = MigrationsConfig.builder()
    .withLocationsToScan(
        "classpath:my/awesome/migrations", (1)
        "file:/path/to/migration" (2)
    ).build();

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <create>
    <constraint name="unique_isbn" type="unique">
      <label>Book</label>
      <properties>
        <property>isbn</property>
      </properties>
    </constraint>
  </create>
</migration>

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <catalog>
    <constraints>
      <constraint name="unique_isbn" type="unique">
        <label>Book</label>
        <properties>
          <property>isbn</property>
        </properties>
      </constraint>
    </constraints>
  </catalog>
  <create item="unique_isbn"/>
</migration>

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <drop item="unique_isbn"/>
</migration>

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <create>
    <index name="node_index_name">
      <label>Person</label>
      <properties>
        <property>surname</property>
      </properties>
    </index>
  </create>
</migration>

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <refactor type="rename.label">
    <parameters>
      <parameter name="from">Engineer</parameter>
      <parameter name="to">DevRel</parameter>
      <parameter name="customQuery"><![CDATA[
        MATCH (person:Engineer)
        WHERE person.name IN ["Mark", "Jennifer", "Michael"]
        RETURN person
      ]]></parameter>
    </parameters>
  </refactor>
</migration>

<?xml version="1.0" encoding="UTF-8"?>
<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
  <?assert that edition is enterprise ?>
  <?assume q' RETURN true?>
</migration>

package some.migrations;

import ac.simons.neo4j.migrations.core.JavaBasedMigration;
import ac.simons.neo4j.migrations.core.MigrationContext;

import org.neo4j.driver.Driver;
import org.neo4j.driver.Session;

public class V001__MyFirstMigration implements JavaBasedMigration {

    @Override
    public void apply(MigrationContext context) {
        try (Session session = context.getSession()) { (1)
            // Steps necessary for a migration
        }
    }
}

<migration xmlns="https://michael-simons.github.io/neo4j-migrations">
    <drop item="a" ifExists="true" />
    <create item="a" />
</migration>

public class V1_2_3__AddLastNameIndex implements JavaBasedMigration {
    @Override
    public void apply(MigrationContext context) {
        // Your thing
    }

    @Override
    public String getSource() {
        return "Add last name index"; (1)
    }
}

// assume that edition is enterprise

// assume that edition is community.

// assume that version is 4.3

// assume that version is ge 4.0

// assert that edition is enterprise
// assume that version is 4.3
CREATE CONSTRAINT isbn_exists IF NOT EXISTS ON (book:Library) ASSERT exists(book.isbn);

// assert that edition is enterprise
// assume that version is ge 4.4
CREATE CONSTRAINT isbn_exists IF NOT EXISTS FOR (book:Library) REQUIRE book.isbn IS NOT NULL;

// assume q' RETURN true

// assert that edition is enterprise
// assert that version is 4.4
// assume q' MATCH (book:Library) RETURN count(book) = 0
CREATE CONSTRAINT isbn_exists IF NOT EXISTS FOR (book:Library) REQUIRE book.isbn IS NOT NULL;