阅读目录
简介
Psycopg 是Python语言的PostgreSQL数据库接口。 它的主要优势在于完全支持Python DB API 2.0，以及安全的多线程支持。它适用于随时创建、销毁大量游标的、和产生大量并发INSERT、UPDATE操作的多线程数据库应用。Psycopg包内含 ZPsycopgDA，一个Zope数据库接口。
示例1：新建表、插入、修改
#-*- coding: utf-8 -*- import psycopg2 def main(user,pwd,ip,port,dbname): connection = "dbname=%s user=%s password=%s host=%s port=%s" % (dbname, user,pwd, ip, port) db = psycopg2.connect(connection) cur = db.cursor() #创建表 sql_stat = "CREATE TABLE test_class_id(id INT PRIMARY kEY NOT NULL, test_class TEXT, test_id CHAR(10))"; cur.execute(sql_stat) #插入表 sql_stat = "insert into test_class_id(id, test_class, test_id) values (1, 'a', '3')" cur.execute(sql_stat) sql_stat = "insert into test_class_id(id, test_class, test_id) values (2, 'a', '3')" cur.execute(sql_stat) #更改字段值 sql_stat = "update test_class_id set test_class='b' where id=1" cur.execute(sql_stat) db.commit() if __name__ == "__main__": user = '****' pwd = '****' ip = '***' port = '5432' dbname = '****' main(user, pwd, ip, port, dbname) print "Done~~"
结果
注：这里有多次提交execute 最后一次提交commit，如果没有最后的一次commit，你们前面的提交也是不执行的。
示例2：批量表操作
-*- coding: utf-8 -*- import psycopg2 class_ids = [] class_ids.append({"test_id": 1, "test_class":"A", "test_id":"1"}) class_ids.append({"test_id": 2, "test_class":"A", "test_id":"2"}) class_ids.append({"test_id": 3, "test_class":"B", "test_id":"3"}) def main(user,pwd,ip,port,dbname): connection = "dbname=%s user=%s password=%s host=%s port=%s" % (dbname, user,pwd, ip, port) db = psycopg2.connect(connection) cur = db.cursor() #sql_del = "delete from cdb_chk_group" #cur.execute(sql_del) #批量操作 sql_stat = 'insert into test_class_id(id, test_class, test_id) values (%(test_id)s, %(test_class)s,%(test_id)s)' cur.executemany(sql_stat, class_ids) db.commit() if __name__ == "__main__": user = '****' pwd = '****' ip = '****' port = '5432' dbname = '****' main(user, pwd, ip, port, dbname) print "Done~~"
验证
用法补充
1. 查询数据，并输出结果
查询一条
>>> cur.execute("select * from test;") >>> cur.fetchone() (1, 100, "abc'def")
查询所有条
>>> cur.execute("select * from test;") >>> cur.fetchall() [(1, 100, "abc'def"),(2, 100, "abc'def")]
本文转自jihite博客园博客，原文链接：http://www.cnblogs.com/kaituorensheng/p/5180104.html，如需转载请自行联系原作者
