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 =...

删除已有的表 删除已有的表 import mysql . connector   mydb = mysql . connector . connect ( host = "localhost" , user = "myusername" , passwd = "mypassword" , database = "my...

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...

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 = ...

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...

从已有表中删除记录 从已有表中删除记录 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...

SQL 函数 SQL 函数 SQL functions SQL avg() SQL count() SQL first() SQL last() SQL max() SQL min() SQL sum() SQL Group By SQL Having SQL ucase() SQL lcase() SQL mid() S...

SQL DELETE 语句 DELETE 语句 语法 Person: 删除某行 结果: 删除所有行 SQL DELETE 语句 DELETE 语句 DELETE 语句用于删除表中的行。 语法 DELETE FROM 表名称 WHERE 列名称 = 值 Person: LastName Fi...

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