sqlite简单封装

import sqlite3


class Sql_Demo(object):
    def __init__(self, datebase):
        self.conn = sqlite3.connect(datebase)  # 创建connect对象
        self.cursor1 = self.conn.cursor()  # 创建cursor对象
        self.message_error = "输入的sql语句有问题"
        self.message_erro_table = "此表已存在"
        self.message_delete = "删除成功"
        self.message_update = "更新成功"
        self.message_insert = "插入成功"

    # 创建表
    def create_table(self, sql):
        try:
            self.cursor1.execute(sql)
        except:
            print(self.message_erro_table)
            return False

    # 插入SQL处理 例如 insert into table_name(?,?) values(?,?)
    def sql_insert_format(self, sql, file_value):
        return sql.format(*file_value.keys(), *file_value.values())

    # 更新或删除的SQL处理 例如 selec * from table_name where id=?
    def sql_update_select_format(self, sql, values):
        return sql.format(**values)

    # 执行SQL方法
    def sql_execute(self, sql):
        self.cursor1.execute(sql)

    # 提交事务，关闭连接
    def sql_commit_close(self):
        self.conn.commit()
        self.conn.close()

    # 插入数据
    def insert(self, sql, file):
        try:
            for line in file:
                self.sql_execute(self.sql_insert_format(sql, line))
        except:
            print("插入失败")
            return False
        self.sql_commit_close()
        print(self.message_insert)

    # 查询所有数据
    def select_all(self, sql):
        try:
            self.sql_execute(sql)
            for line in self.cursor1.fetchall():  # 循环遍历获得结果集
                print(line)
        except:
            print(self.message_error)
            return False
        self.sql_commit_close()

    # 有条件查询数据
    def select(self, sql, line):
        try:
            self.sql_execute(self.sql_update_select_format(sql, line))
            for line in self.cursor1.fetchall():  # 循环遍历获得结果集
                print(line)

        except:
            print(self.message_error)
            return False

        self.sql_commit_close()

    # 删除全部数据
    def delete_all(self, sql):
        try:
            self.sql_execute(sql)
        except:
            print(self.message_error)
            return False
        self.sql_commit_close()
        print(self.message_delete)

    # 有条件的删除
    def delete(self, sql, file):
        try:
            for line in file:
                self.sql_execute(self.sql_update_select_format(sql, line))
        except:
            print(self.message_error)
            return False
        self.sql_commit_close()
        print(self.message_delete)

    # 更新数据
    def update(self, sql, file):
        try:
            for line in file:
                self.sql_execute(self.sql_update_select_format(sql, line))
        except:
            print(self.message_error)
            return False
        self.sql_commit_close()
        print(self.message_update)