1

我有一个带有某些类型字段的 pojo Set<String>。我想将它们作为 json 保存在数据库中,所以我创建了一个自定义 typeHandler,但是当我尝试保存时,我得到了错误:没有找到 TypeHandler ...。

 testSave(it.infora.suap.service.MailMessageServiceTest): nested exception is org.apache.ibatis.executor.ExecutorException: There was no TypeHandler found for parameter recipients_to of statement it.infora.suap.persistence.MailMessageMapper.insertEmailMessage

a中的参数recipients_toSet<String>

这是我的自定义 typeHandler 类:

public class SetTypeHandler implements TypeHandler<Set<String>>{


    @Override
    public void setParameter(PreparedStatement ps, int columnIndex, Set<String> parameter, JdbcType jt) throws SQLException {
    ps.setString(columnIndex,  serializeToJson(parameter));
    }

    @Override
    public Set<String> getResult(ResultSet rs, String columnName) throws SQLException {
        return deserializeFromJson(rs.getString(columnName));
    }

    @Override
    public Set<String> getResult(ResultSet rs, int columnIndex) throws SQLException {
        return deserializeFromJson(rs.getString(columnIndex));
    }

    @Override
    public Set<String> getResult(CallableStatement cs, int columnIndex) throws SQLException {
        return deserializeFromJson(cs.getString(columnIndex));
    }

    private String serializeToJson(Set<String> parameter){
        Gson gson = new Gson();
        return gson.toJson(parameter);
    }

    private Set<String> deserializeFromJson(String value){
        Gson gson = new Gson();
        Type collectionType = new TypeToken<Set<String>>(){}.getType();
        Set<String> result  = gson.fromJson(value, collectionType);

        return result;       
    }

}

怎么了?我正在使用带注释的映射器接口而不是 mapper.xml

谢谢

安德烈亚

4

1 回答 1

4

我在这里这里找到了一些信息,但您似乎错过了

@MappedTypes(Set.class) 
public class SetTypeHandler implements TypeHandler<Set<String>>{
于 2013-03-06T10:26:29.363 回答