bigint | 易学教程

Mysql returning incorrect bigint result by one, very strange error

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问题 I really don't know what is going on here. I have a database table that looks like this: With this data: When I run this query SELECT * FROM game WHERE id = 4 in phpmyadmin I get back this result as expected: But when I make this query on it through a rest api (where gameId = 4) var query = connection.query("SELECT * FROM game WHERE id = ? ",[game.gameId],function(err,rows){ I get this result Where adminId for some reason has been subtracted by one. I really haven't a clue what is going on. I

Primary key id reaching limit of bigint data type

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问题 I have a table that is exposed to large inserts and deletes on a regular basis (and because of this there are large gaps in the number sequence of the primary id column). It had a primary id column of type 'int' that was changed to 'bigint'. Despite this change, the limit of this datatype will also inevitably be exceeded at some point in the future (current usage would indicate this to be the case within the next year or so). How do you handle this scenario? I'm wondering (shock horror)

What if I need a very very big autoincrement ID?

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问题 According to the MySQL website, the signed bigint can go up to 18446744073709551615. What if I need a number bigger than that for the auto-incrementing primary key? 回答1: If you insert 1 million records per second 24x7, it will take 584542 years to reach the limit. I hope by then a next version of MySQL will support bigger ID columns, and developers will all be able to do back-of-the-envelope calculations before posting to Stack Overflow :) 回答2: With such a number (1 to 18446744073709551615),

Rails Migration: Bigint on PostgreSQL seems to be failing?

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问题 Trying to create a table with a bigint column creates a standard integer column instead. What could be going wrong? I don't know where to start looking. I'm using this in the migration: create_table :table_name do |t| t.integer :really_big_int, limit: 8 end I'm using Ruby 1.9.2, PostgreSQL 9.0.3 and Rails 3.0.9. I've dropped the database and ran the migrations several times and it still doesn't create the bigint column. 回答1: For some reason the create table doesn't like bigint. You can,

json_decode AND json_encode long integers without loosing data

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问题 As noted in the PHP documentation, when json_decode ing a data structure containing long integers, they'll be converted to floats. The workaround is to use JSON_BIGINT_AS_STRING , which preserves them as strings instead. When json_encode ing such values, JSON_NUMERIC_CHECK will encode those numbers back into large integers: $json = '{"foo":283675428357628352}'; $obj = json_decode($json, false, JSON_BIGINT_AS_STRING); $json2 = json_encode($obj, JSON_NUMERIC_CHECK); var_dump($json === $json2);

BigInteger in C?

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问题 What is the easiest way to handle huge numbers in C? I need to store values in the Area 1000^900... Does anybody know of an easy way to do that? Any help would really be appreciated! 回答1: Use libgmp: GMP is a free library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. There is no practical limit to the precision except the ones implied by the available memory in the machine GMP runs on... Since version 6, GMP is distributed

BigInteger in C?

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PostgreSQL之SELECT...GROUP BY...HAVING

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1.SELECT...GROUP BY的使用 PostgreSQL9.3官方文档： http://www.postgres.cn/docs/9.3/sql-select.html#SQL-GROUPBY SELECT查询在通过了WHERE过滤器之后，生成的输出表可以继续用GROUP BY 子句进行分组，然后用HAVING子句删除一些分组行。 SELECT select_list FROM ... [WHERE ...] GROUP BY grouping_column_reference [, grouping_column_reference]... HAVING condition GROUP BY 子句用于把那些在表中所列出的列上共享相同值的行聚集在一起。这些列的列出顺序并没有什么关系。效果是把每组共享相同值的行缩减为一个组行，它代表该组里的所有行。这样就可以删除输出里的重复和/或计算应用于这些组的聚集。比如： highgo=# create table tests1(id int primary key,name varchar,num int); highgo=# insert into tests1 values(1,'yy',3),(2,'ws',2),(3,'yy',6);

【CMDB】onecmdb 开源cmdb/ITIL软件部署

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参考： https://blog.csdn.net/shaw_young/article/details/78730724 资源：官方主页：http://www.onecmdb.org/wiki/index.php?title=Main_Page 官方下载：http://sourceforge.net/projects/onecmdb/files/ 环境： centos 7.5 x64 mariadb 5.5.56 ip:192.168.3.5 安装linux64位系统32位支持包glibc.i686 yum list glibc* yum install glibc.i686 解压到目录： tar -xzvf onecmdb-2.1.0-linux.i386.tar.gz -C /opt 引入mysql jar包：下载mysql-connector-java-5.1.48.tar.gz tar -xzvf mysql-connector-java-5.1.48.tar.gz cd mysql-connector-java-5.1.48 cp mysql-connector-java-5.1.48.jar /opt/onecmdb/tomcat/webapps/ROOT/WEB-INF/lib 编辑配置文件：修改连接端口 cd /opt/onecmdb/tomcat/conf

RJDBC wrongly reading bigintegers from database table

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问题 I am retrieving a column containing big integers from a data base into R (using RJDBCs dbGetQuery method). For a test case, one can consider the following numbers 1000522010609612 1000522010609613 1000522010609614 1000522010609615 1000522010609616 1000522010609617 **971000522010609612 1501000522010819466 971000522010943717 1501000522010733490** R seems to be reading the contents wrongly. The way in which it is available to me in R (after I read from the database using RJDBC) is: