sqlite

Ubuntu安装sqllite3并使用

由 你说的曾经没有我的故事 提交于 2020-01-25 05:25:52
Ubuntu安装sqllite3并使用 1 安装sqllite3 sudo apt-get install sqlite3 # 如果安装出现404 Not Found，更新apt-get即可 sudo apt-get update 2 常用命令 2.1 key words sqlite3 test . db // 打开或创建一个数据库 . database //每个.db文件就是一个数据库 . tables //显示数据库中所有的表 . schema //显示所有的表的创建语句 . schema tableX //显示表tableX的创建语句 . quit //退出 3 示例 我们现在有8个字段，名称及类型如下： Name Type INX INTEGER DEVICE_ID TEXT FRONT_DEVICE_ID TEXT LINE INTEGER LOC INTEGER VOLUME INTEGER WEIGHT INTEGER DATE TEXT 3.1 create table CREATE TABLE DARK_ROOM_CLS ( INX INTEGER PRIMARY KEY , DEVICE_ID TEXT NOT NULL , FRONT_DEVICE_ID TEXT NOT NULL , LINE INTEGER NOT NULL , LOC INTEGER

SQLite and database initialization

由 独自空忆成欢 提交于 2020-01-25 05:17:06
问题 I'm about to use a database on Android for the first time, but there is a thing I'm not sure to understand. Question 1 A database need to be created in an app ; which means I need to give some "time" to the creation/initialization of this database. This time can be quite long depending on the amount of datas I need to store, and I'm wondering, do we really need to create the database in the right app? I mean, isn't it better to just create a dummy app which will create and init my database,

SQLiteException near “null”: syntax error: , while compiling: INSERT OR REPLACE INTO

由 独自空忆成欢 提交于 2020-01-25 03:46:06
问题 I am trying to configure a simple DbHelper, and getting an error while executing. The error is: SQLiteException near "null": syntax error: , while compiling: INSERT OR REPLACE INTO I cannot figure out what is the problem? The DbHelper class is: package com.sqlite.test1; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; public class DbHelper extends SQLiteOpenHelper{ public static final int DB_VERSION = 1; public

SQLAlchemy - how to get class for existing database table and then update that table

由 孤人 提交于 2020-01-25 03:09:26
问题 I have an existing database (SQLite) and am trying to update a table in the database from an excel file. I'm bringing the excel data into python using pandas. It's in a dataframe with the index set to the same keys that are in the target database table. I'm trying to use sqlalchemy to batch update the database table, but I am having trouble defining the class. The database already exists, so I need to extract the class information. from sqlalchemy import create_engine from sqlalchemy.orm

SQLite problem “unable to open the database file”

由 旧城冷巷雨未停 提交于 2020-01-25 02:19:10
问题 I come to you after a lot of hours googling and reading other discussions about SQLite on StackOverflow, but I definitely can't find any explanation to my problem, so here it is : The context : I'm developping an application for iPad wich has to deal with some "large" amounts of data, in several occasions. In one of them, I must import points coordinates from a .kml file (Google's xml for geographical data) into my database, in order to reuse them later with a MKMapView and load them faster

Can one android device access database located on another android device [closed]

由 佐手、 提交于 2020-01-25 01:01:18
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 days ago . I have two android devices suppose "A" and "B". "A" host SQLite database or in another words, database is located at "A". Now my question is, Is it possible to access database hosted by device "A" from device "B"?(Using Socket or anything else but Without use of internet, router

How to store image in sqlite database in iphone? [closed]

由 a 夏天 提交于 2020-01-25 00:46:10
问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *path = [documentsDirectory

SQLite Select…Where statement “no such column” error

由 |▌冷眼眸甩不掉的悲伤 提交于 2020-01-25 00:39:23
问题 I have the following SQLite statement: "SELECT * FROM HISTORICALPICKS WHERE BETTYPE = " + betType.ToString().ToUpper() + " ORDER BY DATETIME ASC" And betType.ToString().ToUpper() is the string "ATS" For some reason I get the following error: System.Data.SQLite.SQLiteException : SQL logic error or missing database no such column: ATS ...which leaves me baffled. ATS is not a column. BETTYPE is the column. I want it to select rows that have "ATS" in the BETTYPE column. My hunch is that something

How to insert a record in Sqlite?

由 不问归期 提交于 2020-01-24 23:50:13
问题 please anybody tell me how to insert records in sqlite through objective c? 回答1: You can use a block of code like this -(NSString*) GetDatabasePath { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ; NSString *documentsDirectory = [paths objectAtIndex:0] ; return [documentsDirectory stringByAppendingPathComponent:@"Your Database"] ; } -(void)InsertPurchase { sqlite3_stmt *statement=nil; NSString *path = [self GetDatabasePath]; NSString *query;

Javascript Global variable problem

由 纵饮孤独 提交于 2020-01-24 23:08:15
问题 First I know WebKit do not allow Make synchronous requests to SQLite database. And I'm start playing with it and tried to assign result to global variable "data". I still not sure if it's possible but want to ask you. I'm created global object to store respond from DB var data = {}; Here is DB class var db = { mydb: false, init: function () { try { if (!window.openDatabase) { alert('not supported'); } else { this.mydb = openDatabase('test_db', '1.0', 'Test DB', 1024*1024*5); } } catch(e) { //
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