sqlite | 易学教程

How to import quoted data from a CSV file into SQLite?

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问题 Better progress: nicholas@mordor:~/csv$ nicholas@mordor:~/csv$ sqlite3 SQLite version 3.31.1 2020-01-27 19:55:54 Enter ".help" for usage hints. Connected to a transient in-memory database. Use ".open FILENAME" to reopen on a persistent database. sqlite> sqlite> .import BCCDC_COVID19_Dashboard_Case_Details.csv details ... BCCDC_COVID19_Dashboard_Case_Details.csv:25475: unescaped " character BCCDC_COVID19_Dashboard_Case_Details.csv:25475: unescaped " character sqlite> sqlite> select * from

python3.5 sees but python3.9 does not see sqlite3

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问题 My machine: Linux eyes 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u3 (2019-06-16) x86_64 GNU/Linux i.e. python3.5 is its native python3 Have two python3 in the system: root@machine: # update-alternatives --list python3 /usr/bin/python3.5 /usr/local/bin/python3.9 root@machine: # update-alternatives --config python3 There are 2 choices for the alternative python3 (providing /usr/bin/python3). Selection Path Priority Status --------------------------------------------------------------- 0 /usr

python3.5 sees but python3.9 does not see sqlite3

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SVN cleanup问题

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简要说明： svn: E155017: Can't install '*' from pristine store, because no checksum is recorded for this file svn报错：“Previous operation has not finished; run 'cleanup' if it was interrupted“ 问题描述：使用Tor 执行update操作，出现更新错误，提示信息如下：按照提示执行cleanup操作，解决方案：一般的clean up报错，只要回到当前目录上一层进行clean up就能继续提交svn内容。但是，当回到最上层目录都无法clean up时，需要按照如下步骤： sqlite3 PROJECT-ROOT\.svn\wc.db delete from work_queue 解决步骤 1）清空SVN队列搜索wc.db，看是否存在该数据库文件 2) 安装sqlite3 SQLite on Windows 进入 SQL 下载页面： http://www.sqlite.org/download.html 下载 Windows 下的可执行文件包： sqlite-tools-win32-x86- <build#> .zip 注意: <build#> 是 sqlite 的编译版本号将 zip

linux 下安装python2.7.13

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1.下载所必要的依赖包 yum - y install python - devel openssl openssl - devel gcc sqlite sqlite - devel mysql - devel libxml2 - devel libxslt - devel [ root@cdh1 20191018 ] # ll * gz - rwxrwxrwx 1 root root 389668 Oct 18 14 : 55 distribute - 0.6 . 10 .tar.gz - rwxrwxrwx 1 root root 1246072 Apr 20 2018 pip - 10.0 . 1 .tar.gz - rwxrwxrwx 1 root root 17076672 Dec 18 2016 Python - 2.7 . 13 .tgz - rwxrwxrwx 1 root root 796957 Apr 24 2016 setuptools - 1.4 . 2 .tar.gz --gz包请自动解压 2.安装python2.7.13 cd / BIG_DATA / EDW / ZYXF_EDW / PYTHON_APP / EDW_ONLINE / 20191018 / Python - 2.7 . 13 . / configure -- prefix=/usr

MySQL总结

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一、数据库简介 1、MySQL数据库介绍 MySQL是一个关系型数据库管理系统，有瑞典MySQL AB公司开发，后来被sun公司收购，sun公司后来后被Oracle公司收购，目前是Oracle旗下产品。 MySQL开源，支持多平台、免费、使用范围广，是了解学习关系型数据库的首选。特点： 1、使用c和c++编写，并使用了多种编译器进行测试没保证源代码的可移植性 2、支持多种操作系统，如linux、windows、unix等 3、为多种编程语言提供了API。如c++、c、java、python、PHP等 4、优化的SQL查询算法，有效地提高查询速度 5、可以处理拥有上千万条记录的大型数据库 6、使用标准的SQl数据语言形式 2、数据库定义数据存储-数据库阶段数据库：是指长期存储在计算机内，有组织的数据集合，简而言之，数据库就是一个存储数据的地方。表：是数据库中存储的基本单位，数据按照分类存储到不同的表中，能够非常高效的查询其中的数据。二、SQL语言 1、SQL语言定义 Structured Query Language 结构化查询语言 SQL是一门特殊的语言，专门用来操作关系型数据库，当前关系型数据库都支持使用SQL语言进行操作，也就是说可以通过SQL语言操作Oracle、mysql、SqlServer、sqlite等等所有的关系型数据库。 2、SQL语言主要分为： DQL

How to store SQLite prepared statements for later?

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问题 Right now I have code that uses the rusqlite sqlite bindings to open a db connection and do a bunch of db operations in my application like this: extern crate rusqlite; use rusqlite::SqliteConnection; struct MyAppState { db: SqliteConnection, // ... pretend there's other fields here ... } impl MyAppState { fn new() -> MyAppState { let db = SqliteConnection::open(":memory:").unwrap(); MyAppState { db: db } } fn query_some_info(&mut self, arg: i64) -> i64 { let mut stmt = self.db.prepare(

How to store SQLite prepared statements for later?

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Exit the SQLite shell on Android

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问题 I'm using SQLite 3 on Mac OS X's ADB shell to view my application database using: #sqlite3 mydb.db SQLite version 3.5.9 Enter ".help" for instructions sqlite> quit ...> .quit ...> After I wrongly typed the quit command above, instead of the .quit for example, the shell goes into the ...> prompt where none of the known commands seem to work. I can't even get out by Ctrl + C , Ctrl + / , Esc , etc. I have to ⌘ + Q i.e. quit the terminal instance to restart. I know this isn't exactly a

Why does Rusqlite reject the Option type when executing a query?

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问题 I'm trying to insert CSV data into a SQLite database. stripe_id is optional, and so its type is Option<&str> . All the other fields are &str . When I use conn.execute to insert the values, they all insert correctly except for stripe_id , which throws an error saying it expects &str and not Option . I've searched the docs and Option<T> implements ToSQL , and when I've tried replacing my code with the Rusqlite example that includes an Option value, it throws the same error for the example code.