如何从字典创建sqlite3表 [英] how to create a sqlite3 table from a dictionary

问题描述

import sqlite3

db_file = 'data/raw/db.sqlite'
tables = {
    'Players': {
        'id': 'INTEGER PRIMARY KEY',
        'fname': 'TEXT',
        'lname': 'TEXT',
        'dob': 'DATETIME',
        'age': 'INTEGER',
        'height': 'INTEGER', # inches
        'weight': 'INTEGER', # pounds
        'rank': 'INTEGER',
        'rhlh': 'INTEGER', # 0 - right, 1 - left
        'bh': 'INTEGER', # 0 - onehand, 1 - twohand
        'city': 'TEXT', # birth city
        'county': 'TEXT' #birth country
        }
}


conn = sqlite3.connect(db_file)
c = conn.cursor()

for table in tables.keys():
    for cols in tables[table].keys():
        c.execute("CREATE TABLE {} ( \
                        {} {})".format(table, cols, tables[table][cols]))

c.close()
conn.close()

有没有一种方法可以将这个 tables 嵌套的dict对象简单地转换为db表?我收到 sqlite3.OperationalError:table Players已经存在的错误，这很明显，因为我多次调用 CREATE TABLE .

Is there a way to simply turn this tables nested dict object into a db table? The error I am getting sqlite3.OperationalError: table Players already exists which is obvious because I am calling CREATE TABLE more than once.

有人使用嵌套的字典(最终将包含多个表)来制作数据库时，有什么捷径?这是可怕的俩吗?我应该怎么做?

Does anyone have a quick trick in making a DB like so, using a nested dictionary which will eventually contain multiple tables? Is this a terrible pracitce? What should I do differently?

谢谢！

我如何解决:

答案在下面的评论中.

推荐答案

在这里，一次快速且可能很脏的查询全部在一个查询中.

Here, quick and probably dirty one, all in one query.

import sqlite3

db_file = 'data/raw/db.sqlite'
tables = {
    'Players': {
        'id': 'INTEGER PRIMARY KEY',
        'fname': 'TEXT',
        'lname': 'TEXT',
        'dob': 'DATETIME',
        'age': 'INTEGER',
        'height': 'INTEGER', # inches
        'weight': 'INTEGER', # pounds
        'rank': 'INTEGER',
        'rhlh': 'INTEGER', # 0 - right, 1 - left
        'bh': 'INTEGER', # 0 - onehand, 1 - twohand
        'city': 'TEXT', # birth city
        'county': 'TEXT' #birth country
        }
}


conn = sqlite3.connect(db_file)
c = conn.cursor()

for table in tables.keys():
    fieldset = []
    for col, definition in tables[table].items():
        fieldset.append("'{0}' {1}".format(col, definition))

    if len(fieldset) > 0:
        query = "CREATE TABLE IF NOT EXISTS {0} ({1})".format(table, ", ".join(fieldset))

        c.execute(query)

c.close()
conn.close()

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