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DB2. Support for unique indices with null columns

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This commit is contained in:
Roland Praml
2022-01-07 11:31:00 +01:00
parent 193617a107
commit 23a5d577a6
1 changed files with 15 additions and 3 deletions
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ebean-ddl-generator/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/DB2Ddl.java
+15 -3
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@@ -22,10 +22,22 @@ public class DB2Ddl extends PlatformDdl {
public String alterTableAddUniqueConstraint(String tableName, String uqName, String[] columns, String[] nullableColumns) {
if (nullableColumns == null || nullableColumns.length == 0) {
return super.alterTableAddUniqueConstraint(tableName, uqName, columns, nullableColumns);
} else {
// Hmm: Complex workaround: https://www.ibm.com/developerworks/mydeveloperworks/blogs/SQLTips4DB2LUW/entry/unique_where_not_null_indexes26?lang=en
return "-- NOT SUPPORTED " + super.alterTableAddUniqueConstraint(tableName, uqName, columns, nullableColumns);
}
if (uqName == null) {
throw new NullPointerException();
}
StringBuilder sb = new StringBuilder("create unique index ");
sb.append(uqName).append(" on ").append(tableName).append('(');
for (int i = 0; i < columns.length; i++) {
if (i > 0) {
sb.append(",");
}
sb.append(columns[i]);
}
sb.append(") exclude null keys");
return sb.toString();
}
@Override