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MySQL NDB Cluster API Developer Guide
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4.3.2.10 PartitionKey

Annotation on a class or member to define the partition key. If annotating a class or interface, either a single column or multiple columns can be specified. If annotating a member, neither column nor columns should be specified.

4.3.2.10.1 Synopsis
 @Target(value={java.lang.annotation.ElementType.TYPE, java.lang.annotation.ElementType.FIELD, java.lang.annotation.ElementType.METHOD}) @Retention(value=java.lang.annotation.RetentionPolicy.RUNTIME) public @interface PartitionKey {
  public String column ;
  public Column[] columns ;
}
4.3.2.10.2 column

Name of the column to use for the partition key

Table 4.89 column

Parameter Description
return the name of the column to use for the partition key

4.3.2.10.3 columns

The column(s) for the partition key

Table 4.90 columns

Parameter Description
return the column(s) for the partition key