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From "Eirik Bjorsnos (JIRA)" <j...@apache.org>
Subject [jira] Created: (DDLUTILS-268) Detect foreign keys on MySQL MyISAM showing up as indexes
Date Thu, 13 Jan 2011 13:16:45 GMT
Detect foreign keys on MySQL MyISAM showing up as indexes 

                 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:

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.addForeignKey(new CloneHelper().clone(key, table, database,

After this transformation,  DdlUtils will not suggest removing the index and adding the foreign

If this something that could be added to DdlUtils proper in some way?

Here's the DB I used for testing this:

<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"
        <column name="CustomerName" required="false" type="VARCHAR" size="64"/>

    <table name="orderLine">
        <column name="orderLineId" primaryKey="true" required="true" type="INTEGER" size="10"
        <column name="orderId" required="true" type="INTEGER" size="10"/>
        <foreign-key foreignTable="orderTable">
            <reference local="orderId" foreign="orderId"/>


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