SequenceStyleGenerator、接尾辞の代わりに接頭辞を使用する方法

Question

私は休止状態でシーケンスを扱っていますが、フォーマットには命名制約があります。フォーマットはSEQ_です。 SequenceStyleGeneratorをシーケンス名の接頭辞のためにカスタマイズ/パラメータ化するにはどうすればよいですか？

Answer 1

私は、SequenceStyleGeneratorを継承するクラスを作成し、接頭辞を持つためにdecideSequenceName関数をオーバーライドしました。

public class PrefixSequenceStyleGenerator extends SequenceStyleGenerator { 
public static final String CONFIG_PREFER_PREFIX = "prefer_sequence_prefix"; 
public static final String CONFIG_SEQUENCE_PER_ENTITY_PREFIX = "sequence_per_entity_prefix"; 
public static final String DEF_SEQUENCE_PREFIX = "SEQ_"; 

@Override 
protected String determineSequenceName(Properties params, Dialect dialect) { 
    boolean usePrefix = ConfigurationHelper.getBoolean(CONFIG_PREFER_PREFIX, params, false); 
    if(usePrefix){ 
     final String sequencePerEntityPrefix = ConfigurationHelper.getString(CONFIG_SEQUENCE_PER_ENTITY_PREFIX, params, DEF_SEQUENCE_PREFIX); 
     String sequenceName = ConfigurationHelper.getBoolean(CONFIG_PREFER_SEQUENCE_PER_ENTITY, params, false) ? sequencePerEntityPrefix + params.getProperty(JPA_ENTITY_NAME) : DEF_SEQUENCE_NAME; 
     final ObjectNameNormalizer normalizer = (ObjectNameNormalizer) params.get(IDENTIFIER_NORMALIZER); 
     sequenceName = ConfigurationHelper.getString(SEQUENCE_PARAM, params, sequenceName); 
     if (sequenceName.indexOf('.') < 0) { 
      sequenceName = normalizer.normalizeIdentifierQuoting(sequenceName); 
      final String schemaName = params.getProperty(SCHEMA); 
      final String catalogName = params.getProperty(CATALOG); 
      sequenceName = Table.qualify(
        dialect.quote(catalogName), 
        dialect.quote(schemaName), 
        dialect.quote(sequenceName) 
        ); 
      } 
     return sequenceName; 
    }else{ 
     return super.determineSequenceName(params, dialect); 
    } 
} 

}

と私は私のスーパークラスでそれを使用します。

@MappedSuperclass 

パブリッククラスAbstractModelWithTableSequenceはAbstractModelInterface {

private static final long serialVersionUID = 6503670320979543539L; 

@Id 
@Column(name="id") 
@GenericGenerator(name = "seq_generator", 
strategy = "com.gms.utils.PrefixSequenceStyleGenerator", 
parameters = { 
     @org.hibernate.annotations.Parameter(
       name = "optimizer", value = "pooled-lo"), 
     @org.hibernate.annotations.Parameter(
       name = "initial_value", value = "1"), 
     @org.hibernate.annotations.Parameter(
       name = "increment_size", value = "1"), 
     @org.hibernate.annotations.Parameter(
       name = PrefixSequenceStyleGenerator.CONFIG_PREFER_SEQUENCE_PER_ENTITY, value = "true"), 
     @org.hibernate.annotations.Parameter(
       name = PrefixSequenceStyleGenerator.CONFIG_SEQUENCE_PER_ENTITY_PREFIX, value = "SEQ_"), 
     @org.hibernate.annotations.Parameter(
       name = PrefixSequenceStyleGenerator.CONFIG_PREFER_PREFIX, value = "true"), 
    } 
) 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seq_generator") 
private Long id; 

@Override 
public Long getId() { 
    return id; 
} 

@Override 
public void setId(Long id) { 
    this.id = id; 
} 

@Override 
public boolean isNew() { 
    return getId() == null || getId() == 0; 
} 

@Override 
public int hashCode() { 
    final int prime = 31; 
    int result = 1; 
    result = prime * result + ((id == null) ? 0 : id.hashCode()); 
    return result; 
} 

@Override 
public boolean equals(Object obj) { 
    if (this == obj) { 
     return true; 
    } 
    if (obj == null) { 
     return false; 
    } 
    if (getClass() != obj.getClass()) { 
     return false; 
    } 
    AbstractModelWithTableSequence other = (AbstractModelWithTableSequence) obj; 
    if (id == null) { 
     if (other.id != null) { 
      return false; 
     } 
    } else if (!id.equals(other.id)) { 
     return false; 
    } 
    return true; 
} 

}

を実装