Detect foreign keys on MySQL MyISAM showing up as indexes
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Key: DDLUTILS-268
URL: https://issues.apache.org/jira/browse/DDLUTILS-268
Project: DdlUtils
Issue Type: Improvement
Components: Core - MySql
Reporter: Eirik Bjorsnos
Assignee: Thomas Dudziak
When reading a MyISAM MySQL database model from the database, DdlUtils will
read in Index instead of a ForeignKey.
As a result of this, DdlUtils suggests to remove the index and create the
foreign key. After applying this change, DdlUtils will still not see the
ForeignKey and thus suggests the same change all over again.
We work around this by looking for all indexes in a table. If we find an
equally named foreign key in our "wanted" model, we remove the index and add a
foreign key:
{code}
public void transform(Database database, Database wanted, Platform platform) {
if (platform instanceof MySqlPlatform) {
for (Table table : database.getTables()) {
for (Index index : table.getIndices()) {
Table wantedTable = wanted.findTable(table.getName());
if (wantedTable != null) {
ForeignKey key =
findCandidateForeignKey(platform.getSqlBuilder(), index, wantedTable);
if (key != null) {
table.removeIndex(index);
table.addForeignKey(new CloneHelper().clone(key,
table, database, true));
}
}
}
}
}
}
{code}
After this transformation, DdlUtils will not suggest removing the index and
adding the foreign key.
If this something that could be added to DdlUtils proper in some way?
Here's the DB I used for testing this:
{code}
<database name="ddlutils-db" xmlns="http://db.apache.org/ddlutils/schema/1.1";>
<table name="orderTable">
<column name="orderId" primaryKey="true" required="true" type="INTEGER"
size="10" autoIncrement="true"/>
<column name="CustomerName" required="false" type="VARCHAR" size="64"/>
</table>
<table name="orderLine">
<column name="orderLineId" primaryKey="true" required="true"
type="INTEGER" size="10" autoIncrement="true"/>
<column name="orderId" required="true" type="INTEGER" size="10"/>
<foreign-key foreignTable="orderTable">
<reference local="orderId" foreign="orderId"/>
</foreign-key>
</table>
</database>
{code}
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