python之數據庫操作

1.插入數據

import MySQLdb

#創建連接
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='123456',db='test')
cur = conn.cursor()

# execute 執行，%s形式是為了防止sql注入
reCount = cur.execute('insert INTO test1 (name,country,age,address) VALUES (%s,%s,%s,%s,%s)',('2','jerry','china','23','beijing'))

'''
#另一種寫法
sql = "insert INTO test1 (name,country,age,address) VALUES (%s,%s,%s,%s,%s)"
params = ('2','jerry','china','23','beijing')
reCount = cur.execute(sql,params)
'''

# 提交
conn.commit()
# 關閉連接
cur.close()
conn.close()

print reCount


2. 更新數據庫
import MySQLdb
# 創建連接
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='123456',db='test')
cur = conn.cursor()

sql = "update test1 set address = %s where id = 2"
# 添加逗號表示是一個序列
params = ('BeiJing',)
reCount = cur.execute(sql,params)

# 提交
conn.commit()
# 關閉連接
cur.close()
conn.close()

print reCount


3. 查找數據
import MySQLdb
# 創建連接
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='123456',db='test')
cur = conn.cursor()

sql = "select * FROM test1 "
reCount = cur.execute(sql)

#顯示查找到的數據，結果以字典形式展示
print cur.fetchall()

# 關閉連接cur.close()
conn.close()

print reCount

4. 刪除數據
import MySQLdb
# 創建連接
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='123456',db='test')
cur = conn.cursor()

sql = "delete FROM test1 WHERE id = 2"
reCount = cur.execute(sql)

# 提交
conn.commit()
# 關閉連接
cur.close()
conn.close()

print reCount