anpeiyong - 博客园

JavaSE---The Platform Environment

摘要： 1、Configuration Utilities This section describes some of the configuration utilities that help an application access its startup context. 1.1、Properti 阅读全文

posted @ 2020-10-10 17:11 anpeiyong 阅读(93) 评论(0) 推荐(0)

JavaSE---Basic I/O

摘要： 1、I/O Streams 1.1、Byte Streams Programs use byte streams to perform input and output of 8-bit bytes. （程序使用字节流输入|输出 8位字节） All byte stream classes are 阅读全文

posted @ 2020-10-10 11:29 anpeiyong 阅读(120) 评论(0) 推荐(0)

JavaSE---官方文档

摘要： https://docs.oracle.com/javase/7/docs/technotes/guides/index.html#javalanguage 阅读全文

posted @ 2020-10-09 17:39 anpeiyong 阅读(576) 评论(0) 推荐(0)

Mysql---表数据逻辑结构

摘要： https://baijiahao.baidu.com/s?id=1598257553176708891&wfr=spider&for=pc 阅读全文

posted @ 2020-10-08 17:27 anpeiyong 阅读(184) 评论(0) 推荐(0)

JDK官方文档

摘要： https://docs.oracle.com/en/java/javase/index.html 阅读全文

posted @ 2020-10-07 14:38 anpeiyong 阅读(598) 评论(0) 推荐(1)

Mysql---Optimization

该文被密码保护。阅读全文

posted @ 2020-10-06 17:31 anpeiyong 阅读(12) 评论(0) 推荐(0)

Mysql---MySQL Server Administration

摘要： 1、The Mysql Server mysqld is the MySQL server. 1.1、Configuring the Server a，查看Mysql Server options and configurable system variables mysqld --verbose 阅读全文

posted @ 2020-10-06 10:11 anpeiyong 阅读(292) 评论(0) 推荐(0)

Mysql---MySQL 8.0

摘要： 1、General Information 1.1、What Is New in MySQL 8.0 Features Added in MySQL 8.0 1.2、MySQL Information Sources MySQL Websites： The primary website for M 阅读全文

posted @ 2020-10-06 09:37 anpeiyong 阅读(99) 评论(0) 推荐(0)

Mysql---索引命中

摘要： 1、假设 test_demo表中有个复合索引 idx(sex,company,job) 1.1、最左前缀原则 explain select * from test_demo where sex='' and job ='' and company='' 结果：type：ref、key：idx ex 阅读全文

posted @ 2020-09-30 16:14 anpeiyong 阅读(354) 评论(0) 推荐(0)

SQL---Miscellaneous Functions

摘要： 1、DEFAULT 返回指定字段的默认值 DEFAULT(col_name) 2、UUID Returns a Universal Unique Identifier (UUID) generated according to RFC 4122 阅读全文

posted @ 2020-09-30 14:52 anpeiyong 阅读(113) 评论(0) 推荐(0)

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