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Python 类中使用 cursor.execute() 时语法错误的解决方法

在 Python 类中使用 cursor.execute() 时，出现语法错误（如 SyntaxError 或 SQL 语法相关错误）通常是因为 SQL 语句格式不正确、占位符使用不当，或参数传递方式不符合预期...问题背景在 Python 2.7 中，当我在类方法中尝试运行 cursor.execute("SELECT VERSION()") 时，会收到一个语法错误。然而，在类外运行相同的代码却可以正常工作。...cursor.execute 行使用了 4 个空格而不是应有的一个制表符，导致缩进错位。打开编辑器中的“显示空格”功能可以更容易地发现此类问题。...以下是如何解决此问题：将 cursor.execute 行中的空格替换为制表符。确保 Python 代码中所有缩进都正确对齐。...通过遵循这些建议，应该可以解决大部分由于 cursor.execute() 语法问题导致的错误。

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Python 操作SQLite数据库

(insert) insert = "insert into persion(id,name,age,msg) values(4,'wang',4,'hello wang');" cursor.execute...;" cursor.executemany(insert,data) 简单的查询语句的使用 select = "select * from persion;" cursor.execute(select...= "delete from persion where id=3;" cursor.execute(delete) select = "select * from persion;" cursor.execute...(create) cursor.execute("insert into login(username,password) values('admin','123123');") cursor.execute...("insert into login(username,password) values('guest','123123');") cursor.execute("insert into login(

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使用 pymysql 操作MySQL数据库

try: with connection.cursor() as cursor: print('--------------新建表--------------') cursor.execute...row[0], row[1], row[2], row[3], sep='\t') print('--------------清除数据--------------') cursor.execute...print('--------------插入数据--------------') cursor.execute(insert_table_sql, ('yitian', '易天', datetime.date.today...())) cursor.execute(insert_table_sql, ('zhang3', '张三', datetime.date.today())) cursor.execute(insert_table_sql..., ('li4', '李四', datetime.date.today())) cursor.execute(insert_table_sql, ('wang5', '王五', datetime.date.today

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10分钟吃透，python操作mysql数据库的增、删、改、查

charset=utf8; pymysql库的安装在pycharm编译器中的终端输入一下代码 pip install pymysql 或者根据下面的图片中的引导下载：增加数据写法一（静态）： cursor.execute...123456789')") 写法二（动态）： sql = "insert into admin(username,password,mobile) values (%s,%s,%s)" cursor.execute..."]) 写法三（动态）： sql = "insert into admin(username,password,mobile) values (%(n1)s,%(n2)s,%(n3)s)" cursor.execute...)") # 写法二（动态） # sql = "insert into admin(username,password,mobile) values (%s,%s,%s)" # cursor.execute...利用execute的第一个参数判断"）： sql = "select * from admin where id>%s" res = cursor.execute(sql, [2, ]) data_list

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python中的SQLite操作

("INSERT INTO COMPANY VALUES (2, 'Allen', 25, 'Texas', 15000.00 );") cursor.execute("INSERT INTO COMPANY...VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );") cursor.execute("INSERT INTO COMPANY VALUES (4, 'Mark...', 25, 'Rich-Mond ', 65000.00 );") cursor.execute("INSERT INTO COMPANY VALUES (5, 'David', 27, 'Texas...', 85000.00 );") cursor.execute("INSERT INTO COMPANY VALUES (6, 'Kim', 22, 'South-Hall', 45000.00 );"...) cursor.execute("INSERT INTO COMPANY VALUES (7, 'James', 24, 'Houston', 10000.00 );") cursor.execute

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python教程之pymysql及DB类的实现

laoleiphp', charset='utf8') cursor=conn.cursor() sql="select * from sky_guest limit 10 " cursor.execute...(sql) lists=cursor.fetchall() sql="insert into sky_guest set title='测试insert' " cursor.execute...self.conn=conn def query(self,sql,params=()): cursor=self.conn.cursor() cursor.execute...self,sql,params=()): cursor = self.conn.cursor(cursor = pymysql.cursors.DictCursor) cursor.execute...self,sql,params=()): cursor = self.conn.cursor(cursor = pymysql.cursors.DictCursor) cursor.execute

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RDKit支持PostgreSQL配置

("select version()") reply = cursor.fetchall() print(reply) cursor.execute("drop schema if exists drugbank...cascade") cursor.execute("create schema drugbank") cursor.execute(""" create table drugbank.drugbank...(query) print(query[:1000]) cursor.execute("select count(*) from drugbank.drugbank") print(cursor.fetchall...(), len(drugbank)) cursor.execute("select * from drugbank.drugbank limit 10") print(cursor.fetchall...()) cursor.execute("select * from drugbank.drugbank where id > 500 and id < 600 limit 10;") print(

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python 串行执行和并行执行实例

20.5.101.31/tlyy') cursor = conn.cursor() def query01(): tname = threading.current_thread() aa=10 # cursor.execute...SELECT * FROM TEST100 WHERE ID = %s", [aa]) cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""") cursor.execute...SELECT * FROM TEST100 WHERE ID = %s", [aa]) cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""") cursor.execute...SELECT * FROM TEST100 WHERE ID = %s", [aa]) cursor.prepare("""SELECT * FROM TEST100 WHERE ID=:id""") cursor.execute...= cursor.fetchall() print row return row def query05(): tname = threading.current_thread() aa=50 # cursor.execute

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安装pyodbc_编程python是什么

cursor.execute("select user_id, user_name from users") row = cursor.fetchone() if row: print row...6）由于cursor.execute返回一个cursor，所以你可以把上面的语句简化成： for row in cursor.execute("select user_id, user_name from...""", ['2001-01-01', 'y']) cursor.execute("select count(*) as user_count from users where age > ?"...cursor.execute("insert into products(id, name) values ('pyodbc', 'awesome library')") cnxn.commit() cursor.execute...cursor.execute("delete from products where id ?"

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python使用phoenixdb操作hbase

= 'http://localhost:8765/' conn = phoenixdb.connect(url, autocommit=True) cursor = conn.cursor() # cursor.execute...("DROP TABLE users") cursor.execute("CREATE TABLE users (id INTEGER PRIMARY KEY, username VARCHAR, password...VARCHAR)") cursor.execute("UPSERT INTO users VALUES (?..., (1, 'admin', 'Letmein')) cursor.execute("UPSERT INTO users VALUES (?, ?, ?)"...(cursor_factory=phoenixdb.cursor.DictCursor) cursor.execute("SELECT * FROM users WHERE id=1") user =

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Python 操作 MySQL

('select * from bigstu') for row in cursor.fetchall(): print(row) # 查 cursor.execute('select id,...conn.commit() # 别忘了提交添加列在mobile后面添加一列cash addCo = "alter table bigstu add cash int after mobile" cursor.execute...(addCo) 如果要设置默认值 addCo = "alter table bigstu add cash int default 0 after mobile" cursor.execute(addCo...) 删删除数据删除 name=秀吉的数据 deleteSql = "delete from bigstu where name = '%s'" cursor.execute(deleteSql...% '秀吉') 删除列删除cash列 dropCo = "alter table bigstu drop cash" cursor.execute(dropCo) 改修改数据更新符合条件的数据

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pymysql模块

sql='select * from userinfo where name="%s" and password="%s"' %(user,pwd) #注意%s需要加引号 print(sql) res=cursor.execute...进行字符串拼接 # sql="select * from userinfo where name='%s' and password='%s'" %(user,pwd) # print(sql) # res=cursor.execute...注意%s需要去掉引号，因为pymysql会自动为我们加上单条数据执行sql语句 cursor.execute(sql,[user,pwd]) #pymysql模块自动帮我们解决sql注入的问题，只要我们按照...，返回sql影响成功的行数 # print(res) #part2 # sql='insert into userinfo(name,password) values(%s,%s);' # res=cursor.execute...self.conn.close() def fetchone(self,sql,params): cursor = self.cursor cursor.execute

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第十三章 Python数据库编程

返回的数字是影响的行数 0L >>> sql = "insert into user(id,name,password) values('1','xiaoming','123456')" >>> cursor.execute...(sql) 1L >>> conn.commit() # 提交事务，写入到数据库 >>> cursor.execute('show tables') # 查看创建的表 1L >>> cursor.fetchall...() # 返回上一个游标执行的所有结果，默认是以元组形式返回 ((u'user',),) >>> cursor.execute('select * from user') 1L...123456')] >>> cursor.executemany(sql, args) 3L >>> conn.commit() >>> sql = 'select * from user' >>> cursor.execute...1L >>> conn.commit() >>> sql = 'select * from user' >>> cursor.execute(sql)

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Python可视化数据分析09、MySQL读写

20, "潇洒霸气") sqlInsert4 = "insert into users values(0,'{0}',{1},'{2}')".format("删除测试", 20, "待删除数据") cursor.execute...(sqlInsert1) cursor.execute(sqlInsert2) cursor.execute(sqlInsert3) cursor.execute(sqlInsert4) sqlUpdate...= "update users set introduce='{0}' where userName='{1}'".format("潇洒的姑娘", "春梦") cursor.execute(sqlUpdate...) sqlDelete = "delete from users where userName='{0}'".format("删除测试") cursor.execute(sqlDelete) # 提交...db.commit() sql = "select * from users" # 执行SQL cursor.execute(sql) # 回去返回集合 data = cursor.fetchall

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pymysql创建表

password) cursor = connect.cursor() create_database = ''' create database if not exists test; ''' cursor.execute...(create_database) check_databases = ''' show databases; ''' cursor.execute(check_databases) pprint.pprint...(cursor.fetchall()) use_test = ''' use test; ''' cursor.execute(use_test) create_table = ''' create table...name varchar(45) null, age int null, primary key (id))default character set = utf8; ''' cursor.execute...(create_table) #查询新创建的表的结构 cursor.execute('desc users') result2 = cursor.fetchall() print('----------

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Python连接teradata和Ora

row.val) #连接orcle数据库 conn = cx_Oracle.connect('hr/hr@localhost/orcl') cursor = conn.cursor () cursor.execute...("DROP TABLE TEST") cursor.execute ("CREATE TABLE TEST(ID INT, COL1 VARCHAR(32), COL2 VARCHAR(32...), COL3 VARCHAR(32))") cursor.execute ("INSERT INTO TEST (ID, COL1, COL2, COL3)VALUES(1, 'a', 'b',...'c')") cursor.execute ("INSERT INTO TEST (ID, COL1, COL2, COL3)VALUES(2, 'aa', 'bb', 'cc')") cursor.execute

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Python数据持久化-mysql篇

', charset = 'utf8' ) conn = pymysql.connect(**args) cursor = conn.cursor() cursor.execute...("drop table if exists test") cursor.execute("create table test(id int,name varchar(20))") cursor.execute...('insert into test values(1,"小明")') cursor.execute('insert into test values(2,"小红")') cursor.execute...', charset = 'utf8' ) conn = pymysql.connect(**args) cursor = conn.cursor() cursor.execute...pydb', charset='utf8' ) conn = pymysql.connect(**args) cursor = conn.cursor() cursor.execute

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Python3 操作Mysql数据库

3306, charset='utf8' ) #使用 cursor() 方法创建一个游标对象 cursor cursor = db.cursor() #使用 execute() 方法执行 SQL 查询 cursor.execute...charset='utf8' ) #使用 cursor() 方法创建一个游标对象 cursor cursor = db.cursor() #使用 execute() 方法执行 SQL，如果表存在则删除 cursor.execute...(sql_1) cursor.execute(sql_2) cursor.execute(sql_3) #提交到数据库执行 db.commit() except: #如果发生错误则回滚 db.rollback...(sql) try: #执行SQL语句 cursor.execute(sql) #提交到数据库执行 db.commit() except: #发生错误时回滚 db.rollback() #关闭数据库连接...(sql) try: #执行SQL语句 cursor.execute(sql) #提交到数据库执行 db.commit() except: #发生错误时回滚 db.rollback() #关闭数据库连接

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python使用pymsql

='root', passwd='123456', db='jiangjj') # 创建游标 cursor = conn.cursor() # 执行SQL，并返回收影响行数 effect_row = cursor.execute...passwd='123456', db='jiangjj') # 创建游标 cursor = conn.cursor() #参数传递，必须使用参数的形式 # inp=input("请输入班级：") # r = cursor.execute...方式1 sid=input("请输入ID:") gender=input('请输入性别：') class_cid=input("请输入班级id：") sname=input("请输入姓名：") r = cursor.execute...('update student set sname=%s where sid=%s',('将将将',1)) #删除数据 cursor.execute('delete from student where...sid=%s',(20)) 3、获取查询数据 #查询数据 r = cursor.execute('select * from student') print(r) # result = cursor.fetchall

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44 - 操作MySQL数据库

db db = connectDB() print(type(db)) def createTable(db): cursor = db.cursor() try: cursor.execute...如何向MySQL表中插入数据 def insertRecords(db): cursor = db.cursor() try: cursor.execute('delete...from persons') cursor.execute(''' insert into persons(id, name, age, address..., salary) values(1, 'Bill', 32, 'Colifornia', 20000);''') cursor.execute(...name, age, address, salary) values(2, 'Mike', 30, 'China', 10000);''') cursor.execute

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