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Pandas DatabaseError:提供的绑定数不正确_Pandas_Sqlite - Fatal编程技术网

Pandas DatabaseError:提供的绑定数不正确

Pandas DatabaseError:提供的绑定数不正确,pandas,sqlite,Pandas,Sqlite,我试图从一个大的csv文件查询;我将显示前三行: import pandas as pd df = pd.read_csv('crime.csv', nrows=3); df 由于内存限制,我先创建db文件,然后从那里查询,如下所示: import sqlite3 db = sqlite3.connect("crime.sqlite") for chunk in pd.read_csv('crime.csv', chunksize=1000): chunk.

我试图从一个大的csv文件查询;我将显示前三行:

import pandas as pd 
df = pd.read_csv('crime.csv', nrows=3); df

由于内存限制,我先创建db文件,然后从那里查询,如下所示:

import sqlite3

db = sqlite3.connect("crime.sqlite")

for chunk in pd.read_csv('crime.csv', chunksize=1000):
    chunk.to_sql("crime", db, if_exists="append")
    
db.execute("CREATE INDEX NEIGHBORHOOD_ID on crime(NEIGHBORHOOD_ID)")
db.close()
在这里,我定义了一个从新创建的.sqlite读取并查询的函数:

def crime_neighbor(neighbor_id):
    conn = sqlite3.connect("crime.sqlite")
    q = "SELECT * FROM crime WHERE NEIGHBORHOOD_ID = ?"
    values = (neighbor_id,)
    return pd.read_sql_query(q, conn, values)
当我运行
crime\u neighbor(“cbd”)
时,我得到以下错误:

DatabaseError: Execution failed on sql 'SELECT * FROM crime WHERE NEIGHBORHOOD_ID = ?': Incorrect number of bindings supplied. The current statement uses 1, and there are 0 supplied.

我尝试将
values=(neighbor\u id,)
更改为
values=[neighbor\u id,]
,但错误保持不变。

检查
pd.read\u sql\u查询(q,conn,values)的语法。
。它实际上并不发送参数。查看函数签名和参数。

您忘了告诉
read\u sql\u query
在哪里可以找到
参数。查看函数签名和参数@DinoCoderSaurus谢谢;在我显式地将值赋给params参数后,它起作用了:
返回pd.read\u sql\u查询(q,conn,params=values)
你能回答这个问题吗,这样我就可以结束这篇文章了?谢谢