sqlite

How do I call SQLitePCL.Batteries.Init().?

由 牧云@^-^@ 提交于 2020-12-30 04:51:25
问题 I am attempting to create an SQLite database for my application and have come across this error. System.Exception: 'You need to call SQLitePCL.raw.SetProvider(). If you are using a bundle package, this is done by calling SQLitePCL.Batteries.Init().' I created a simple console app the run the exact same code for creation, with no issues. The code looks like this! using (var dataContext = new SampleDBContext()) { dataContext.Accounts.Add(new Account() { AccountName = name, AccountBalance =

install sqlite3 dev and other packages in centos

由 蓝咒 提交于 2020-12-29 09:24:05
问题 I am trying to install sqlite dev and other libraries in a centos machine with cpanel, to be able to compile an application. I am more acquainted with debian than centos, and I know the libraries I need are: libsqlite3-dev libkrb5-dev libssl-dev libcurl3-dev libboost-all-dev For what I could find online, the corresponding package in centos for libsqlite3-dev is sqlite-dev . However, when I run yum install sqlite-devel I get the following message: No package sqlite-devel available I don't know

Android Room inserts duplicate entities

由 半城伤御伤魂 提交于 2020-12-29 06:12:15
问题 I'm using Android's Room library for the database interaction in an application and I'm sort of stumped on how to prevent duplicate entries from being inserted into the database. I feel like I must be missing something because this seems like it should be simple to do. I've searched Google for various combinations of words relating to the subject to no avail. I'm essentially using what one of the samples does for inserting and querying. The Entity: @Entity(tableName = "cameras") public class

Exit a SQLite 3 database

由 笑着哭i 提交于 2020-12-29 05:07:29
问题 I have an SQLite 3 database in SUSE Linux. It's stuck at the command prompt like so: sqlite> q ...> exit ...> .exit ...> quit ...> .quit How do I exit out of the database? 回答1: Type ; + Enter to terminate the current statement (will give an error message because what you typed so far is not a valid statement but never mind). Then .quit + Enter . Note that in SQLite 3, SQL statements must be terminated with a delimiter, which is ; by default. The non-SQL commands, which start with a . , do not

Exit a SQLite 3 database

由 ≡放荡痞女 提交于 2020-12-29 05:05:46
问题 I have an SQLite 3 database in SUSE Linux. It's stuck at the command prompt like so: sqlite> q ...> exit ...> .exit ...> quit ...> .quit How do I exit out of the database? 回答1: Type ; + Enter to terminate the current statement (will give an error message because what you typed so far is not a valid statement but never mind). Then .quit + Enter . Note that in SQLite 3, SQL statements must be terminated with a delimiter, which is ; by default. The non-SQL commands, which start with a . , do not

django连接mysql配置方法

由 房东的猫 提交于 2020-12-29 03:24:46
转载地址：https://blog.csdn.net/it_dream_er/article/details/52092262 最近在学习django，学到第五章模型时，需要连接数据库，然后，在这里分享一下方法。 起初是不知道怎样配置mysql数据库，但是还好，django的官网上面有相关的配置方法，下面就直接给分享一下。 这是settings文件里面的基础配置，使用的是sqlite,那我们需要连接其他数据库呢？ DATABASES = { 'default': { 'ENGINE': 'django.db.backends.sqlite3', 'NAME': 'mydatabase', } } 下面是mysql的配置方法： DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'mydatabase', 'USER': 'mydatabaseuser', 'PASSWORD': 'mypassword', 'HOST': '127.0.0.1', 'PORT': '3306', } } 下面解释一下，里面参数的意思： ENGINE : 指定数据库驱动，不同的数据库这个字段不同，下面是常见的集中数据库的ENGINE的写法： django .db .backends .postgresql #

Does SQLite3 have prepared statements in Node.js?

由 ￣綄美尐妖づ 提交于 2020-12-29 03:01:45
问题 From the npm docs, only visible prepared statements are for insert. Does these prepared statement work for Select, update, and delete? I tried for select, there isn't a .each function where the rows are called back. Anyone been able to do this or have links to resources, cause I can sure as hell unable to find any. 回答1: According to the node-sqlite3 API documentation, you can use parameters in your SQL queries in several different ways: // Directly in the function arguments. db.run("UPDATE

Does SQLite3 have prepared statements in Node.js?

由 ≯℡__Kan透↙ 提交于 2020-12-29 02:59:04
问题 From the npm docs, only visible prepared statements are for insert. Does these prepared statement work for Select, update, and delete? I tried for select, there isn't a .each function where the rows are called back. Anyone been able to do this or have links to resources, cause I can sure as hell unable to find any. 回答1: According to the node-sqlite3 API documentation, you can use parameters in your SQL queries in several different ways: // Directly in the function arguments. db.run("UPDATE

Does SQLite3 have prepared statements in Node.js?

由 江枫思渺然 提交于 2020-12-29 02:58:35
问题 From the npm docs, only visible prepared statements are for insert. Does these prepared statement work for Select, update, and delete? I tried for select, there isn't a .each function where the rows are called back. Anyone been able to do this or have links to resources, cause I can sure as hell unable to find any. 回答1: According to the node-sqlite3 API documentation, you can use parameters in your SQL queries in several different ways: // Directly in the function arguments. db.run("UPDATE

createrepo 创建自己的yum源

由 谁都会走 提交于 2020-12-29 00:28:25
1.createrepo 命令介绍 createrepo 命令用于创建yum源（软件仓库），即为存放于本地特定位置的众多rpm包建立索引，描述各包所需依赖信息，并形成元数据 语法： -u --baseurl <url> 指定Base URL的地址 -o --outputdir <url> 指定元数据的输出位置 -x --excludes <packages> 指定在形成元数据时需要排除的包 -i --pkglist <filename> 指定一个文件，该文件内的包信息将被包含在即将生成的元数据中，格式为每个包信息独占一行，不含通配符、正则，以及范围表达式。 -n --includepkg 通过命令行指定要纳入本地库中的包信息，需要提供URL或本地路径。 -q --quiet 安静模式执行操作，不输出任何信息. -g --groupfile <groupfile> 指定本地软件仓库的组划分，范例如下： createrepo -g comps.xml /path/to/rpms 注意：组文件需要和rpm包放置于同一路径下。 -v --verbose 输出详细信息。 -c --cachedir <path> 指定一个目录，用作存放软件仓库中软件包的校验和信息。 当createrepo在未发生明显改变的相同仓库文件上持续多次运行时，指定cachedir会明显提高其性能。 --update
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