python - MySQL中的Python动态查询

我使用python mysql从数据库中获取数据。但我不知道如何将三个非常相似的查询合并到一个查询中。这是我的代码：

if self.X and not self.Y:
        query = """
            SELECT tb1.email
            FROM table1 as tb1
            join table2 as tb2 ON tb2.id= tb1.p_id
            WHERE tb2.id={}
            """.format(self.X)

elif self.X and self.Y:
      query = """
            SELECT tb1.email
            FROM table1 as tb1
            join table2 as tb2 ON tb2.id= tb1.p_id
            WHERE tb2.id={}
            AND tb1.id ={}
            """.format(self.X, self.Y)
else:
    query = """
        SELECT tb1.email
        FROM table1 as tb1
        join table2 as tb2 ON tb2.id= tb1.p_id
        WHERE tb1.id={}
        """.format( self.Y)

正如您所看到的，三个查询之间的唯一区别是在一行中。如何使我的代码更可靠？

最佳答案

简单（附加到查询）：

query = """
    SELECT tb1.email
    FROM table1 as tb1
    join table2 as tb2 ON tb2.id= tb1.p_id
    WHERE {}.id = {}
    """

if self.X:
    query = query.format('tb2', self.X)
    if self.Y: query += f' AND tb1.id = {self.Y}'
elif self.Y:
    query = query.format('tb1', self.Y)

关于python - MySQL中的Python动态查询，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/57542861/