如何将 Pandas DataFrame 插入现有的 PostgreSQL 表?
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How do I insert a pandas DataFrame to an existing PostgreSQL table?
提问by Train Heartnet
I have a pandas DataFrame dfand a PostgreSQL table my_table. I wish to truncate my_tableand insert df(which has columns in the same order) into my_table, without affecting the schema of my_table. How do I do this?
我有一个 pandas DataFramedf和一个 PostgreSQL table my_table。我想截断my_table和插入df(其中有以相同的顺序列)进入my_table,在不影响的模式my_table。我该怎么做呢?
In a rather naive attempt, I tried dropping my_tableand then using pandas.DataFrame.to_sql, but this creates a new table with a different schema.
在一个相当幼稚的尝试中,我尝试删除my_table然后使用pandas.DataFrame.to_sql,但这会创建一个具有不同架构的新表。
回答by MaxU
I would manually truncate the table and then simply let Pandas do its job:
我会手动截断表格,然后让 Pandas 完成它的工作:
con.execute('TRUNCATE my_table RESTART IDENTITY;')
df.to_sql('my_table', con, if_exists='append')

