Python 连接SQLite数据库文件

Posted 2020-11-21 nelson2013

涉及：

• Python连接db文件
• 如何按照列名获取数据
• 如何传入参数

示例代码如下：

# encoding=utf-8

import sqlite3

def get_signal_names(db_file_path):
    names = list()
    with sqlite3.connect(db_file_path, isolation_level="IMMEDIATE", timeout=60, check_same_thread=False) as con:
        # 设置可以使用名称来获取查询后的数据
        con.row_factory = sqlite3.Row
        cur = con.cursor()
        sql = "select distinct(Name) from Channels order by Name asc"
        cur.execute(sql)
        results = cur.fetchall()
        for row in results:
            names.append(row["Name"])
        return names


def get_channel_record(db_file_path, signal_name):
    channel = dict()
    with sqlite3.connect(db_file_path, isolation_level="IMMEDIATE", timeout=60, check_same_thread=False) as con:
        con.row_factory = sqlite3.Row
        cur = con.cursor()
        sql = "select MessageId, MessageChannel, SignalType from test_tb where Name = ?"
        # 注意(signal_name,)元组类型后的逗号
        cur.execute(sql, (signal_name,))
        re = cur.fetchone()

        channel["message_id"] = re["MessageId"]
        channel["signal_type"] = re["SignalType"]
        channel["message_channel"] = re["MessageChannel"]


    return channel

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