search
HomeDatabaseMysql TutorialPython连接MySQL及对其操作

论文实验涉及,主要是记个笔记,见谅!下面是测试代码(实现数据库、表建立、插入数据、查询数据、更新数据): # -*- coding: cp936 -*-import MySQLdbtry: conn=MySQLdb.connect(host=localhost,user=root,passwd=19900216) #conn=MySQLdb.connect(host=lo

论文实验涉及,主要是记个笔记,见谅!下面是测试代码(实现数据库、表建立、插入数据、查询数据、更新数据):

# -*- coding: cp936 -*-
import MySQLdb


try:
    conn=MySQLdb.connect(host='localhost',user='root',passwd='19900216')
    #conn=MySQLdb.connect(host='localhost',user='root',passwd='19900216',db='world')
    #print "conn=",conn;
    cur=conn.cursor()
    #print "cur=",cur;
    cur.execute('create database if not exists python')
    conn.select_db('python')
    cur.execute('create table test(id int,info varchar(20))')
    value=[1,'hi rollen']
    cur.execute('insert into test values(%s,%s)',value)
    
    values=[]
    for i in range(9):
        values.append((i,'hi rollen'+str(i)))

    cur.executemany('insert into test values(%s,%s)',values)
    conn.commit()
    test=cur.execute('select * from test')
    print test #记录条数
    result=cur.fetchone()
    print 'ID: %s info %s' %result
    results=cur.fetchmany(5)
    for r in results:
        print r

    cur.scroll(0,mode='absolute')

    results=cur.fetchall()
    for r in results:
        print r[1]
    cur.execute('update test set info="I am rollen" where id=3')

    conn.commit()
    cur.close()
    conn.close()
except MySQLdb.Error,e:
    print "Mysql Error %d: %s" %(e.args[0],e.args[1])


代码注释:

代码中有很多类似xxxone、xxxmany,xxxmany的函数,作用比较好懂!

scroll(self,value,mode):移动指针到某一行。如果mode=‘relative’,则表示从当前所在行移动value条,如果mode=‘absolute’,表示从结果集的第一行移动value条


Q&A:

①Q:Mysql Notifier无法start mysql服务

A:进入Manage Items,删除服务后,再重新添加服务


②Q提示python、mysql不是内部或外部命令……,A:添加变量到PATH;


③Q装MySQL-python时,出现错误.一般是因为缺少visual c++的东西,或者安装的是64位的python

A:安装提示所缺少的东西后,再安装MySQL-python;或者尝试安装MySQL-python-1.2.5.win-amd64-py2.7



参考资料:

http://blog.csdn.net/lishan9133/article/details/7024989

http://www.cr173.com/html/27032_1.html

http://www.cnblogs.com/fnng/p/4115607.html

http://blog.sina.com.cn/s/blog_82a927880102uwty.html

http://www.crifan.com/python_install_module_mysql_mysqldb/

http://www.cnblogs.com/rollenholt/archive/2012/05/29/2524327.html



Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What Are the Limitations of Using Views in MySQL?What Are the Limitations of Using Views in MySQL?May 14, 2025 am 12:10 AM

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

Securing Your MySQL Database: Adding Users and Granting PrivilegesSecuring Your MySQL Database: Adding Users and Granting PrivilegesMay 14, 2025 am 12:09 AM

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

What Factors Influence the Number of Triggers I Can Use in MySQL?What Factors Influence the Number of Triggers I Can Use in MySQL?May 14, 2025 am 12:08 AM

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

MySQL: Is it safe to store BLOB?MySQL: Is it safe to store BLOB?May 14, 2025 am 12:07 AM

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

MySQL: Adding a user through a PHP web interfaceMySQL: Adding a user through a PHP web interfaceMay 14, 2025 am 12:04 AM

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL: BLOB and other no-sql storage, what are the differences?MySQL: BLOB and other no-sql storage, what are the differences?May 13, 2025 am 12:14 AM

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

MySQL Add User: Syntax, Options, and Security Best PracticesMySQL Add User: Syntax, Options, and Security Best PracticesMay 13, 2025 am 12:12 AM

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

MySQL: How to avoid String Data Types common mistakes?MySQL: How to avoid String Data Types common mistakes?May 13, 2025 am 12:09 AM

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools