在 MySQL 中创建数据库 在 MySQL 中创建数据库 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" ) ...

SQL NULL 函数 SQL ISNULL()、NVL()、IFNULL() 和 COALESCE() 函数 SQL Server / MS Access Oracle MySQL SQL NULL 函数 SQL ISNULL()、NVL()、IFNULL() 和 COALESCE() 函数 请看下面的 "Products" 表： ...

防止 SQL 注入 防止 SQL 注入 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database...

选取表中的某些列 选取表中的某些列 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database =...

使用筛选器来选取 使用筛选器来选取 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database =...

使用 fetchone()方法读取表中的单行 使用 fetchone()方法读取表中的单行 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = ...

限制查询返回的记录数 限制查询返回的记录数 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , databa...

选取表中的所有记录 选取表中的所有记录 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database...

获取所插入的 ID 获取所插入的 ID import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database...

更新表中的已有记录 更新表中的已有记录 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database...