Python从MySQL数据库中导出csv文件处理

csv文件导入MySQL数据库

import pymysqlimport csvimport codecsdef get_conn(): conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8') return conndef insert(cur, sql, args): cur.execute(sql, args)def read_csv_to_mysql(filename): with codecs.open(filename=filename, mode='r', encoding='utf-8') as f: reader = csv.reader(f) head = next(reader) conn = get_conn() cur = conn.cursor() sql = 'insert into tb_csv values(%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)' for item in reader: if item[1] is None or item[1] == '': # item[1]作为唯一键，不能为null continue args = tuple(item) print(args) insert(cur, sql=sql, args=args) conn.commit() cur.close() conn.close()if __name__ == '__main__': read_csv_to_mysql('1.csv')

注：

1.csv文件的表头如：

序号,合同编号,义务人,档案柜号,柜内编号,权利人,放款金额,放款日期,他项权利证编号,抵押物地址,结清出库日期,备注,地区

mysql的创建tb_csv表语句

CREATE TABLE tb_csv( xuhao VARCHAR(20), htcode VARCHAR(20), yiwuren VARCHAR(20), dagh VARCHAR(20), gncode VARCHAR(20), quanliren VARCHAR(20), fkmoney VARCHAR(20), fkdata VARCHAR(20), qitacode VARCHAR(20), diyaaddr VARCHAR(100), jqdata VARCHAR(30), beizhu VARCHAR(30), zone VARCHAR(30), PRIMARY KEY(htcode))CHARSET=utf8;

这里为了省事，表中的字段都指明varchar类型

MySQL数据库写入csv文件

import pymysqlimport csvimport codecsdef get_conn(): conn = pymysql.connect(host='localhost', port=3306, user='root', passwd='root', db='test_csv', charset='utf8') return conndef query_all(cur, sql, args): cur.execute(sql, args) return cur.fetchall()def read_mysql_to_csv(filename): with codecs.open(filename=filename, mode='w', encoding='utf-8') as f: write = csv.writer(f, dialect='excel') conn = get_conn() cur = conn.cursor() sql = 'select * from tb_csv' results = query_all(cur=cur, sql=sql, args=None) for result in results: print(result) write.writerow(result)if __name__ == '__main__': read_mysql_to_csv('2.csv')

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