Python導出MySQL數據庫中表的建表語句到文件

 

為了做數據對象的版本控制，需要將MySQL數據庫中的表結構導出成文件進行版本化管理，試寫了一下，可以完整導出數據庫中的表結構信息

# -*- coding: utf-8 -*-
import os
import pymysql


class DBTool:

    conn = None
    cursor = None

    def __init__(self,conn_dict):
        self.conn = pymysql.connect(host=conn_dict['host'],
                                    port=conn_dict['port'],
                                    user=conn_dict['user'],
                                    passwd=conn_dict['password'],
                                    db=conn_dict['db'],
                                    charset=conn_dict['charset'])
        self.cursor = self.conn.cursor()


    def execute_query(self, sql_string):
        try:
            cursor=self.cursor
            cursor.execute(sql_string)
            list = cursor.fetchall()
            cursor.close()
            self.conn.close()
            return list
        except pymysql.Error as e:
            print("mysql execute error:", e)
            raise

    def execute_noquery(self, sql_string):
        try:
            cursor = self.cursor
            cursor.execute(sql_string)
            self.conn.commit()
            self.cursor.close()
            self.conn.close()
        except pymysql.Error as e:
            print("mysql execute error:", e)
            raise

def main():
    conn_dict = {'host': '127.0.0.1', 'port': 3306, 'user': '******', 'password': '******', 'db': 'test', 'charset': 'utf8'}
    conn = DBTool(conn_dict)
    sql_gettables = "select table_name from information_schema.`TABLES` WHERE TABLE_SCHEMA = 'databas_name';"
    list = conn.execute_query(sql_gettables)

    # 文件目標路徑，如果不存在，新建一個
    mysql_file_path = 'D:\mysqlscript'
    if not os.path.exists(mysql_file_path):
        os.mkdir(mysql_file_path)

    mysqldump_commad_dict = {'dumpcommad': 'mysqldump --no-data ', 'server': '127.0.0.1', 'user': '******',
                            'password': '******', 'port': 3306, 'db': 'databse_name'}

    if list:
        for row in list:
            print(row[0])
            # 切換到新建的文件夾中
            os.chdir(mysql_file_path)
            #表名
            dbtable = row[0]
            #文件名
            exportfile =  row[0] + '.sql'
            # mysqldump 命令
            sqlfromat = "%s -h%s -u%s -p%s -P%s %s %s >%s"
            # 生成相應的sql語句
            sql = (sqlfromat % (mysqldump_commad_dict['dumpcommad'],
                                mysqldump_commad_dict['server'],
                                mysqldump_commad_dict['user'],
                                mysqldump_commad_dict['password'],
                                mysqldump_commad_dict['port'],
                                mysqldump_commad_dict['db'],
                                dbtable,
                                exportfile))
            print(sql)
            result = os.system(sql)
            if result:
                print('export ok')
            else:
                print('export fail')

if __name__ == '__main__':
    main()

 

建庫測試

create database test_database
charset utf8mb4 collate utf8mb4_bin;

use test_database;


create table table_a
(
    id int auto_increment not null,
    name varchar(100) unique,
    create_date datetime,
    primary key pk_id(id),
    index idx_create_date(create_date)
);

insert into table_a(name,create_date) values ('aaaaaa',now());
insert into table_a(name,create_date) values ('bbbbbb',now());

create table table_b
(
    id int auto_increment not null,
    name varchar(100) unique,
    create_date datetime,
    primary key pk_id(id),
    index idx_create_date(create_date)
);
insert into table_b(name,create_date) values ('aaaaaa',now());
insert into table_b(name,create_date) values ('bbbbbb',now());

 

執行的時候會提示一個警告，但是不影響最終的結果

mysqldump: [Warning] Using a password on the command line interface can be insecure.

導出建表語句會根據表的數據情況編號自增列，這是mysqldump的問題而不是導出的問題，如果有必要可以需求做相應的修改

 

 

 

去掉mysqldump導出表結構中備注信息

import os

filepath = "D:\\mysqlscript"
# 切換到新建的文件夾中
os.chdir(filepath)
pathDir = os.listdir(filepath)
for file in pathDir:
    lines = open(file, "r")
    content = "use ***;"
    content = content + "\n"
    for line in lines:
        print(line)
        if not (str(line).startswith("--") or str(line).startswith("/*") ):
            if(line!="\n" and str(line).startswith(") ENGINE")):
                content = content +"\n"+ ")"
            else:
                content = content + line
    #將提煉后的內容重新寫入文件
    print(content)
    fp = open(file, 'w')
    fp.write(content)
    fp.close()