mysql

How to get the id of last inserted row using preparedstatement? [duplicate]

由 拈花ヽ惹草 提交于 2021-02-07 09:38:55
问题 This question already has answers here : How to get a value from the last inserted row? [duplicate] (14 answers) Closed 7 years ago . I am using the following code to insert a new row to database, I need to get the id of the last inserted row but when I run the code it shows the following message: SEVERE: java.sql.SQLException: Generated keys not requested. You need to specify Statement.RETURN_GENERATED_KEYS to Statement.executeUpdate() or Connection.prepareStatement(). When I use the

MySQL数据库自动补全命令

由 主宰稳场 提交于 2021-02-07 09:30:37
文章目录 方式一：临时使用自动补全功能 方式二：永久使用自动补全功能 方式三：使用软件mycli实现自动补全功能 注意：第三种方法要在 XSell 中使用，在 finalsell 中使用不了 方式一：临时使用自动补全功能 mysql -u root -p --auto-rehash 方式二：永久使用自动补全功能 vim / etc / my . cnf [ mysql ] auto-rehash 方式三：使用软件mycli实现自动补全功能 此方法需要使用在线源进行软件包的安装 yum -y install epel-release yum -y install python-pip yum -y install python-devel yum clean all yum -y install gcc libffi-devel openssl-devel & & pip install --ignore-installed mycli = = 1.8 .0 yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel gcc wget https: /

Java面试复习体系总结（2021版）

由 ぃ、小莉子 提交于 2021-02-07 09:29:57
Java面试复习体系总结（2021版） 一、Java基础 内容 Java基础（一）：Java集合框架（超详细解析，看完面试不再怕） Java基础（二）：迭代器（Iterator）（含使用方法详解） Java基础 （三）：LinkedList（含使用方法详解） Java基础（四）：ArrayList（含使用方法详解） Java基础（五）：HashSet（使用方法详解） Java基础（六）：HashMap（使用方法详解） Java基础（七）：栈 Stack（使用方法详解） Java基础：详解Arrays.asList() （代码分析） Java基础知识（超详细解析，排班清晰！）：super关键字 Java基础知识（超详细解析，排班清晰！）：多态 Java基础知识（超详细解析，排版清晰！）：Java继承 Java基础知识（超详细解析，排版清晰！）：this关键字 Java基础知识（超详细解析，排版清晰！）：Java抽象 二、Java面试突击 内容 Java面试突击系列（一）：消息队列的面试连环炮 Java面试突击系列（二）：分布式搜索引擎的面试连环炮 Java面试突击系列（三）：分布式缓存 Java面试突击系列（四）：Redis面试常见问题 Java面试突击系列（五）：Redis集群模式 Java面试突击系列（六）：分布式系统 Java面试突击系列（八）：分布式Session方案

How to fetch DateTime from mysql using xdevapi

由 梦想与她 提交于 2021-02-07 09:26:53
问题 When I select a dateTime field, it gets returned as 6 bytes. How can I convert it to a time_point or struct tm? mysqlx::Session session( "mysqlx://root:password@127.0.0.1:33060/catalog" ); auto row = session.sql( "select create_time from information_schema.tables order by 1 LIMIT 1" ).execute().fetchOne(); assert( row[0].getType()==8 );//raw type assert( row[0].getRawBytes().second==6 );//6 bytes var bytes = row[0].getRawBytes().first; //e2 0f 08 0c 0a 32 //2018-08-12 10:50:04 回答1: Hey I just

How to fetch DateTime from mysql using xdevapi

由 我怕爱的太早我们不能终老 提交于 2021-02-07 09:26:36
问题 When I select a dateTime field, it gets returned as 6 bytes. How can I convert it to a time_point or struct tm? mysqlx::Session session( "mysqlx://root:password@127.0.0.1:33060/catalog" ); auto row = session.sql( "select create_time from information_schema.tables order by 1 LIMIT 1" ).execute().fetchOne(); assert( row[0].getType()==8 );//raw type assert( row[0].getRawBytes().second==6 );//6 bytes var bytes = row[0].getRawBytes().first; //e2 0f 08 0c 0a 32 //2018-08-12 10:50:04 回答1: Hey I just

Transactions between two replicating master mysql servers

由 我们两清 提交于 2021-02-07 09:16:00
问题 With a replicating mysql master to master database with innodb engine, if one transaction were to initiate on database A will that row lock for database B until the transaction has been committed? 回答1: The master getting the first transaction is completely separate from the second master and they communicate through a binary log. https://dev.mysql.com/doc/refman/5.7/en/replication-formats.html In the case of something requiring a transaction, then the actual statements are not written to the

How to go about saving an image in blob format to MySQL in Java

由 落花浮王杯 提交于 2021-02-07 08:22:33
问题 For the purpose of a task I have to store an image into MySQL as a blob format (even though it would have been better and ideal to store the image path in the database and keep the image in a folder in localcopy). So far I have researched and couldn't find any answer that could help me, this is what I have done so far Soon as a button click, this will be fired: empdao.insertImage(fis); Image is populated on another even listener like this : static FileInputStream fis = null; static String

How to go about saving an image in blob format to MySQL in Java

由 余生长醉 提交于 2021-02-07 08:22:10
问题 For the purpose of a task I have to store an image into MySQL as a blob format (even though it would have been better and ideal to store the image path in the database and keep the image in a folder in localcopy). So far I have researched and couldn't find any answer that could help me, this is what I have done so far Soon as a button click, this will be fired: empdao.insertImage(fis); Image is populated on another even listener like this : static FileInputStream fis = null; static String

Google Dataflow (Apache beam) JdbcIO bulk insert into mysql database

由 …衆ロ難τιáo~ 提交于 2021-02-07 08:07:17
问题 I'm using Dataflow SDK 2.X Java API ( Apache Beam SDK) to write data into mysql. I've created pipelines based on Apache Beam SDK documentation to write data into mysql using dataflow. It inserts single row at a time where as I need to implement bulk insert. I do not find any option in official documentation to enable bulk inset mode. Wondering, if it's possible to set bulk insert mode in dataflow pipeline? If yes, please let me know what I need to change in below code. .apply(JdbcIO.<KV

Fastest way to read huge MySQL table in python

由 て烟熏妆下的殇ゞ 提交于 2021-02-07 07:57:51
问题 I was trying to read a very huge MySQL table made of several millions of rows. I have used Pandas library and chunks . See the code below: import pandas as pd import numpy as np import pymysql.cursors connection = pymysql.connect(user='xxx', password='xxx', database='xxx', host='xxx') try: with connection.cursor() as cursor: query = "SELECT * FROM example_table;" chunks=[] for chunk in pd.read_sql(query, connection, chunksize = 1000): chunks.append(chunk) #print(len(chunks)) result = pd
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