Question

n00b Java / hibernate问题。我想使用像这样定义的Hibernate来持久保存我的类DataStoreProvider -

class DataStoreProvider{
  @ElementCollection
  @MapKeyClass(value = NativeType.class)
  protected ConcurrentHashMap<NativeType, ODBCType> nativeToODBC;
  protected String name;

  //getters and setters
}

引用的用户定义类定义如下 -

final public class NativeType {

  private String name;
  private int maxPrecision;
  private byte maxScale;

  public NativeType(String name, int maxPrecision, byte maxScale){
    this.name = name;
    this.maxPrecision = maxPrecision;
    this.maxScale = maxScale;
  }
  // getters and setters
}

public enum ODBCType {
  SQL_CHAR(1000000, 0),
  SQL_VARCHAR(1000000, 0),
  SQL_LONGVARCHAR(1000000, 0),
  SQL_WCHAR(1000000, 0),
  ;

  private final int maxPrecision;
  private final int maxScale;

  private ODBCType(int maxPrecision, int maxScale){
    this.maxPrecision = maxPrecision;
    this.maxScale = maxScale;
  }
  // getters and setters

}

NativeType在技术上仅在DataStoreProvider的上下文中具有标识。因此，如果需要，我可以将提供程序包含为NativeType的属性，以使其更清晰。当然，NativeType-DataStoreProvider的关系也是多对一的。

我该怎么做才能为DataStoreProvider创建一个表，另一个列出DataStoreProvider的Id - NativeType列和ODBCType枚举值？

这些是数据库表 -

DataStoreProvider
===============
1|d1
2|d2

nativeToODBC
===============
1|@NativeType(VARCHAR2,4000,0)|ODBCType.SQL_VARCHAR
1|@NativeType(CHAR,4000,0)|ODBCType.SQL_CHAR

提前致谢！

java hibernate持久化成员hashmap <user-defined type，=“”enum =“”>

0 个答案: