将 Python 个字典列表转换为 json 个 Postgresql 数组

Question

我正在尝试将 jsonb 元素的 Python(2.7) 列表插入到 Postgresql(9.4) table 中，数据类型列为：jsonb[].

这是一些代码：

import json
anArray = [{"name":"Joe","age":51,"yob":1964,"gender":"male"},{"name":"George","age":41,"dob":1974,"gender":"male"},{"name":"Nick","age":31,"dob":1984,"gender":"male"}]
myArray = []
#here's what I have so far: 
for e in anArray:
    myArray.append(json.dumps(e))
#this gives me
myArray = ['{"name":"Joe","age":51,"yob":1964,"gender":"male"}','{"name":"George","age":41,"dob":1974,"gender":"male"}','{"name":"Nick","age":31,"dob":1984,"gender":"male"}']
#insert commands
insert_sql = "INSERT INTO my_table (data) VALUES (%s);"
insert_data = (myArray, )
cursor.execute(insert_sql, insert_data)

现在当我尝试插入 myArray 时，psycopg2 给我一个错误

psycopg2.ProgrammingError: column "data" is of type jsonb[] but expression is of type text[]

我不太确定将此数据插入 table 的正确语法是什么。任何 help/pointers 将不胜感激。

解决方案 感谢 piro，这是一个快速的解决方案。

insert_sql = "INSERT INTO my_table (columns) VALUES (%s::jsonb[]);"
insert_data = (myArray, )
cursor.execute(insert_sql, insert_data)

Answer 1

这不是 psycopg 错误：这是 psycopg 所依赖的 PostgreSQL 错误。

错误似乎暗示没有隐式文本[]->jsonb[] 转换，因此您需要手动添加一个：

INSERT INTO my_table (columns) VALUES (%s::jsonb[]);

Answer 2

使用Psycopg JSON adaptation

from psycopg2.extras import Json

data = [
    {"name":"Joe","age":51,"yob":1964,"gender":"male"},
    {"name":"George","age":41,"dob":1974,"gender":"male"},
    {"name":"Nick","age":31,"dob":1984,"gender":"male"}
]

query = '''
    insert into t (j)
    select array_agg(j)
    from jsonb_array_elements(%s) s(j)
'''

cursor.execute(query, (Json(data),))

jsonb_array_elements 将 return 一组 jsonb 将由 array_agg

变成一个 jsonb 的数组

将 Python 个字典列表转换为 json 个 Postgresql 数组

Convert Python list of dicts into Postgresql array of json

python

postgresql

json

psycopg2