Question

我想用JOIN执行SQL查询，我可以将表别名传播到生成的字典键中。例如，我可能有一个查询

query = """
        SELECT t1.col1,t2.col1,t2.col2 
        FROM table1 t1 JOIN table2 t2
        ON t1.col0=t2.col0
        """

我希望输出保持t1，t2别名，因为我有重复的列名（col1）。我会跑

con = sqlite3.connect(dbpath, isolation_level=None, detect_types=sqlite3.PARSE_DECLTYPES)

def dict_factory(cursor, row):
    d = {}
    for idx,col in enumerate(cursor.description): d[col[0]] = row[idx]
    return d

db.dict = con.cursor()
db.dict.row_factory = dict_factory
result = db.dict.execute(query).fetchone()

但这会覆盖col1值。我怎么能让它回来，比方说，

{'t1.col1':123, 't2.col1':234, 't2.col2':345}

谢谢！

Answer 1

The documentation says:

The name of a result column is the value of the "AS" clause for that column, if there is an AS clause. If there is no AS clause then the name of the column is unspecified and may change from one release of SQLite to the next.

So you have to do:

var sessionPattern = IdUtils.CreateUrn<IAuthSession>(""); //= urn:iauthsession:
var sessionKeys = Cache.GetKeysStartingWith(sessionPattern).ToList();

var allSessions = Cache.GetAll<IAuthSession>(sessionKeys);

sqlite3：使用JOIN保留查询中的表名

1 个答案: