python3操作pgsql报错：No operator matches the given name and argument type(s),You might need to add explicit type casts

python操作数据库时报错了，报错内容为“No operator matches the given name and argument type(s),You might need to add explicit type casts”，原因在于字段格式不正确。

举例：

import psycopg2


code='123'
# 建立连接
conn=psycopg2.connect(database="",user="",password="",host="",port="")
# 游标
cur=conn.cursor()
# query
query=("select ... where code = %s" %code)
# 执行query
cur.execute(query)
# 获取结果
rows=cur.fetchall()
print(rows)
    

运行结果：报错，提示"No operator matches the given name and argument type(s),You might need to add explicit type casts"

修改query为query=("select ... where code = cast (%s as VARCHAR)" %code)

运行结果：查询成功

报错原因在于字段格式错误，可通过cast(字段  as VARCHAR)指定格式为VARCHAR。

本文转载https://blog.csdn.net/yongshiaoteman/article/details/81095864