orm

问题 I have just started using TypeORM and I'm struggling getting the following relationship to work: User->Friends, whereas a Friend is also a User Object. My getters, getFriends & getFriendsInverse are working, however; I do now want to distinguish between the two. In other words; when I perform a mysql join I do not want to do a left join on friends and another one on inverseFriends. The getter getFriends() needs to return all friends, regardless of which "side" the object I'm on. Does that

问题 I have just started using TypeORM and I'm struggling getting the following relationship to work: User->Friends, whereas a Friend is also a User Object. My getters, getFriends & getFriendsInverse are working, however; I do now want to distinguish between the two. In other words; when I perform a mysql join I do not want to do a left join on friends and another one on inverseFriends. The getter getFriends() needs to return all friends, regardless of which "side" the object I'm on. Does that

问题 I have seen many questions here for using tuples in the IN clause. My situation is a little different from the others. General usage of tuples in IN clause will look as below Select * from MY_TABLE where (id,name,date) IN ((1,'new','10-JUL-13'),(2, 'old','09-JUN-13')) Considering the above query, my requirement is to retrieve the records with id and name values along with date in a particular range. lets say effectiveDate <= date <= termDate I'm using ORACLE database and MyBatis ORM. I'll get

问题 I have seen many questions here for using tuples in the IN clause. My situation is a little different from the others. General usage of tuples in IN clause will look as below Select * from MY_TABLE where (id,name,date) IN ((1,'new','10-JUL-13'),(2, 'old','09-JUN-13')) Considering the above query, my requirement is to retrieve the records with id and name values along with date in a particular range. lets say effectiveDate <= date <= termDate I'm using ORACLE database and MyBatis ORM. I'll get

问题 I am trying to encrypt a column in my prostrgres DB. The column name is "test" of type "bytea". My enity code is below, @ColumnTransformer( forColumn="test", read="pgp_sym_encrypt(test::bytea, 'mySecretKey')", write="pgp_sym_decrypt(?, 'mySecretKey')") private String test; When I tried to retrieve the entity, I am getting the encrypted data like below. How do I get the decrypted value programmatically? But I get the actual value If i execute a postgres select query. "test": "\

问题 I am trying to encrypt a column in my prostrgres DB. The column name is "test" of type "bytea". My enity code is below, @ColumnTransformer( forColumn="test", read="pgp_sym_encrypt(test::bytea, 'mySecretKey')", write="pgp_sym_decrypt(?, 'mySecretKey')") private String test; When I tried to retrieve the entity, I am getting the encrypted data like below. How do I get the decrypted value programmatically? But I get the actual value If i execute a postgres select query. "test": "\

问题 I am trying to encrypt a column in my prostrgres DB. The column name is "test" of type "bytea". My enity code is below, @ColumnTransformer( forColumn="test", read="pgp_sym_encrypt(test::bytea, 'mySecretKey')", write="pgp_sym_decrypt(?, 'mySecretKey')") private String test; When I tried to retrieve the entity, I am getting the encrypted data like below. How do I get the decrypted value programmatically? But I get the actual value If i execute a postgres select query. "test": "\

问题 Given a vendor-specific SQLAlchemy datatype, such as sqlalchemy.dialects.postgresql.INTEGER , what is the best way to find the generic SQLAlchemy datatype that best corresponds to this vendor-specific type? For instance, if I have the vendor-specific type sqlalchemy.dialects.postgresql.INTEGER , I would want to map back to sqlalchemy.sql.sqltypes.Integer . I do understand that there might be situations where this isn't possible, for instance if the database supports an esoteric type that

问题 Question Given the models below, I want to get a queryset of all pages, annotated with the total number of comments in the thread associated to the page, including all comments in a comment thread tree associated with pages. I am using django-mptt to store comment tree. I can get this in python using comment.get_descendant_count() , but this is very ineficient when querying all pages Models class CommentThread(models.Model): ... class Page(models.Model): ... thread = models.ForeignKey(

问题 I'm fond of Django and use it regularly. I find most of its defaults sane, but one has always bothered me to the point that I override it on every project. The default max length of a URLField model field is 200 characters. The docs verify this limit, but don't explain why it is the case. class URLField(CharField): ... def __init__(self, verbose_name=None, name=None, **kwargs): kwargs['max_length'] = kwargs.get('max_length', 200) ... I override it because plenty of URLs are longer than 200