hibernate的命名策略，可以减少对数据库标识符命名的维护，进一步减少这部份命名的重复性代码量，以提高维护。
hibernate的命名方式，有两类，一类是显式命名，一类是隐式命名。
1）显式命名：在映射配置时，设置的数据库表名，列名等，就是进行显式命名。
2）隐式命名：显式命名一般不是必要的，所以可以选择当不设置名称，这时就交由hibernate进行隐式命名，另外隐式命名还包括那些不能进行显式命名的数据库标识符。接口ImplicitNamingStrategy，就是用于实现隐式命名。
3）过滤命名：接口PhysicalNamingStrategy，用于对显式命名或隐式命名进一步过滤处理。
示例：
TestTable1Impl.java
@Entity
// 隐式命名表名
@Table
public class TestTable1Impl {
//---------------------------------------------------------------
// Field
//---------------------------------------------------------------
@Id
@Column()
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long testId;
@Column(length = 20)
private String testName;
@ManyToOne
private TestTable2Impl testForeign;
//---------------------------------------------------------------
// Method
//---------------------------------------------------------------
public Long getId() {
return testId;
}
public void setId(Long id) {
this.testId = id;
}
public String getName(){
return testName;
}
public void setName(String name){
this.testName = name;
}
public TestTable2Impl getTestForeign() {
return testForeign;
}
public void setTestForeign(TestTable2Impl testForeign) {
this.testForeign = testForeign;
}
}
TestTable2Impl.java
@Entity
// 显式命名表名
@Table(name = "TestTable2Impl")
public class TestTable2Impl {
//---------------------------------------------------------------
// Field
//---------------------------------------------------------------
@Id
@Column()
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long testId;
@Column(length = 20)
private String testName;
//---------------------------------------------------------------
// Method
//---------------------------------------------------------------
public Long getId() {
return testId;
}
public void setId(Long id) {
this.testId = id;
}
public String getName(){
return testName;
}
public void setName(String name){
this.testName = name;
}
}
MyImplicitNamingStrategyImpl.java
public class MyImplicitNamingStrategyImpl extends ImplicitNamingStrategyJpaCompliantImpl implements ImplicitNamingStrategy {
@Override
public Identifier determinePrimaryTableName(ImplicitEntityNameSource source) {
Identifier name = super.determinePrimaryTableName(source);
Identifier result = toStandard(name, "Impl");
System.out.println("ImplicitNamingStrategy / PrimaryTableName -> nt" + name + " => " + result);
return result;
}
private Identifier toStandard(Identifier name, String... removeSuffixes){
if(removeSuffixes == null)
return name;
if(name == null)
return null;
String text = name.getText();
if(removeSuffixes != null){
for(String suffix : removeSuffixes){
if(text.endsWith(suffix))
text = text.substring(0, text.length() - suffix.length());
}
}
return new Identifier(text, name.isQuoted());
}
@Override
public Identifier determineJoinTableName(ImplicitJoinTableNameSource source) {
Identifier name = super.determineJoinTableName(source);
System.out.println("ImplicitNamingStrategy / JoinTableName -> nt" + name);
return name;
}
@Override
public Identifier determineCollectionTableName(ImplicitCollectionTableNameSource source) {
Identifier name = super.determineCollectionTableName(source);
System.out.println("ImplicitNamingStrategy / CollectionTableName -> nt" + name);
return name;
}
@Override
public Identifier determineDiscriminatorColumnName(ImplicitDiscriminatorColumnNameSource source) {
Identifier name = super.determineDiscriminatorColumnName(source);
System.out.println("ImplicitNamingStrategy / DiscriminatorColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineTenantIdColumnName(ImplicitTenantIdColumnNameSource source) {
Identifier name = super.determineTenantIdColumnName(source);
System.out.println("ImplicitNamingStrategy / TenantIdColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineIdentifierColumnName(ImplicitIdentifierColumnNameSource source) {
Identifier name = super.determineIdentifierColumnName(source);
System.out.println("ImplicitNamingStrategy / IdentifierColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineBasicColumnName(ImplicitBasicColumnNameSource source) {
Identifier name = super.determineBasicColumnName(source);
System.out.println("ImplicitNamingStrategy / BasicColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineJoinColumnName(ImplicitJoinColumnNameSource source) {
Identifier name = super.determineJoinColumnName(source);
final String result;
if ( source.getNature() == ImplicitJoinColumnNameSource.Nature.ELEMENT_COLLECTION || source.getAttributePath() == null ) {
result = transformEntityName( source.getEntityNaming() );
} else {
result = transformAttributePath( source.getAttributePath() );
}
System.out.println("ImplicitNamingStrategy / JoinColumnName -> nt" + name + " => " + result);
return toIdentifier( result, source.getBuildingContext() );
}
@Override
public Identifier determinePrimaryKeyJoinColumnName(ImplicitPrimaryKeyJoinColumnNameSource source) {
Identifier name = super.determinePrimaryKeyJoinColumnName(source);
System.out.println("ImplicitNamingStrategy / PrimaryKeyJoinColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineAnyDiscriminatorColumnName(ImplicitAnyDiscriminatorColumnNameSource source) {
Identifier name = super.determineAnyDiscriminatorColumnName(source);
System.out.println("ImplicitNamingStrategy / AnyDiscriminatorColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineAnyKeyColumnName(ImplicitAnyKeyColumnNameSource source) {
Identifier name = super.determineAnyKeyColumnName(source);
System.out.println("ImplicitNamingStrategy / AnyKeyColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineMapKeyColumnName(ImplicitMapKeyColumnNameSource source) {
Identifier name = super.determineMapKeyColumnName(source);
System.out.println("ImplicitNamingStrategy / MapKeyColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineListIndexColumnName(ImplicitIndexColumnNameSource source) {
Identifier name = super.determineListIndexColumnName(source);
System.out.println("ImplicitNamingStrategy / ListIndexColumnName -> nt" + name);
return name;
}
@Override
public Identifier determineForeignKeyName(ImplicitForeignKeyNameSource source) {
Identifier name = super.determineForeignKeyName(source);
String result = null;
String tableName = source.getTableName().getText();
if(tableName.startsWith(TableNamingConfig.TABLE_PREFIX))
tableName = tableName.substring(TableNamingConfig.TABLE_PREFIX.length());
if(source.getColumnNames().size() == 1){
result = TableNamingConfig.FOREIGN_KEY_PREFIX + tableName + "_" + source.getColumnNames().get(0).getText();
} else {
String columnName = source.getReferencedTableName().getText();
if(columnName.startsWith(TableNamingConfig.TABLE_PREFIX))
columnName = columnName.substring(TableNamingConfig.TABLE_PREFIX.length());
result = TableNamingConfig.FOREIGN_KEY_PREFIX + tableName + "_" + columnName;
}
System.out.println("ImplicitNamingStrategy / ForeignKeyName -> nt" + name + " => " + result);
return new Identifier(result, name.isQuoted());
}
@Override
public Identifier determineUniqueKeyName(ImplicitUniqueKeyNameSource source) {
Identifier name = super.determineUniqueKeyName(source);
System.out.println("ImplicitNamingStrategy / UniqueKeyName -> nt" + name);
return name;
}
@Override
public Identifier determineIndexName(ImplicitIndexNameSource source) {
Identifier name = super.determineIndexName(source);
System.out.println("ImplicitNamingStrategy / IndexName -> nt" + name);
return name;
}
}
MyPhysicalNamingStrategyImpl.java
public class MyPhysicalNamingStrategyImpl implements PhysicalNamingStrategy {
@Override
public Identifier toPhysicalCatalogName(Identifier name, JdbcEnvironment jdbcEnvironment) {
System.out.println("PhysicalNamingStrategy / catalog -> nt" + name);
return name;
}
@Override
public Identifier toPhysicalSchemaName(Identifier name, JdbcEnvironment jdbcEnvironment) {
System.out.println("PhysicalNamingStrategy / schema -> nt" + name);
return name;
}
@Override
public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment jdbcEnvironment) {
Identifier result = toStandard(name, "tb_");
System.out.println("PhysicalNamingStrategy / table -> nt" + name + " => " + result);
return result;
}
@Override
public Identifier toPhysicalSequenceName(Identifier name, JdbcEnvironment jdbcEnvironment) {
System.out.println("PhysicalNamingStrategy / sequence -> nt" + name);
return name;
}
@Override
public Identifier toPhysicalColumnName(Identifier name, JdbcEnvironment jdbcEnvironment) {
Identifier result = toStandard(name);
System.out.println("PhysicalNamingStrategy / column -> nt" + name + " => " + result);
return result;
}
private Identifier toStandard(Identifier name){
return toStandard(name, null);
}
private Identifier toStandard(Identifier name, String prefix){
if(name == null)
return null;
String text = name.getText();
StringBuffer buffer = new StringBuffer();
if(prefix != null)
buffer.append(prefix);
char[] chars = text.toCharArray();
for(int i=0, len=chars.length; i= 'A' && c1 <= 'Z'){
if(i > 0 && i + 1 < len){
if(chars[i + 1] < 'A' || chars[i + 1] > 'Z')
buffer.append('_');
}
c1 = (char) (c1 - 'A' + 'a');
}
buffer.append(c1);
}
return new Identifier(buffer.toString(), name.isQuoted());
}
}
TableNamingConfig.java
public class TableNamingConfig {
public static final String TABLE_PREFIX = "tb_";
public static final String FOREIGN_KEY_PREFIX = "fk_";
}
spring.xml
test create-drop org.hibernate.dialect.MySQL5Dialect true true false
Test.java
public class Test {
public static void main(String[] params){
// 命名策略
new Test().test();
}
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml", this.getClass());
SessionFactory factory = null;
try {
factory = (SessionFactory) context.getBean("sessionFactory");
} finally {
if(factory != null){
factory.close();
factory = null;
}
}
}
}
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