sqlite | 易学教程

How to number items in a list view?

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问题 I was wondering how to set a number starting from 1 to n for my listview items. The column is not included in my sqllite database. I would like to use a custom simple cursor adapter that has a textview called labelNumber and set the number to 1 on the first call to newView and bindview and increment the value after each call. Is this the right approach or is there a better way. Obviously this is to help with the navigation of the list view to know your current position? Update- code is

getting “SQLite3::CorruptException: database disk image is malformed” from rails console

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问题 I'm doing Michael Hartl's rails screencast tutorial, and in chapter 7, I'm trying to add a user to the database for reasons of testing the user show page. When I create a user, it gets rolled back with an SQLite3::CorruptException: database disk image is malformed error. Research into this error suggests stopping the "postfix" process, but I don't have postfix installed. Any ideas? Please note, I'm new at this and it's very possible a simple mistake on my part! Thanks! 1.9.3p194 :009 > user =

SQLite In Unity Error

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问题 Hi I am trying to insert a SQLite database on my application but when i try and call values from it i am recieving this error DllNotFoundException: sqlite3 Mono.Data.Sqlite.SQLite3.Open (System.String strFilename, SQLiteOpenFlagsEnum flags, Int32 maxPoolSize, Boolean usePool) Mono.Data.Sqlite.SqliteConnection.Open () MuHC.Start () (at Assets/Scripts/TestScripts/MuHC.cs:13) I have followed this topic here. http://answers.unity3d.com/questions/743400/database-sqlite-setup-for-unity.html and

Readonly connections with ADO.NET, SQLite and TSQL

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问题 My code reads via one connection and writes via another. I dont want to accidentally write with the read connection. How can i make the connection readonly? I am using SQLite ATM and will convert sections of code to tsql when the prototype is over. 回答1: You can add Read Only=True to the read-only connection. Data Source=filename;Read Only=True; 来源： https://stackoverflow.com/questions/2004010/readonly-connections-with-ado-net-sqlite-and-tsql

Select from SQLite with Qt

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问题 I try to deal with SQLite database on Qt 4.5.3 on Linux. I've already created the databsae. Then, I try to perform select on Qt: db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(filename); // Here is FULL path to the database. I've checked it twice :) bool ok = db.open(); qDebug() << db.tables(); QSqlQuery query; query.exec("select * from lessons"); qDebug() << query.size(); qDebug() << query.isSelect(); qDebug() << query.isValid(); But debug console says: ("lessons",

Exception in thread “main” java.lang.NoClassDefFoundError: org/sqlite/NativeDB

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问题 I am trying run an simple example for sqlite on mac. I am pretty sure the code works well on Windows. But not on mac. I really appreciate it if someone could help me with this. The code is running in Eclipse. I added the sqlite-jdbc4-3.8.2-SNAPSHOT.jar as internal & external jar in the project. public class Test1 { private static Connection c; private static String filepath = "/Users/zerocraft/Documents/workspace/sql_test/"; private static String sql; private static Statement query; public

Python中使用SQLite

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使用SQLite SQLite是一种嵌入式数据库，它的数据库就是一个文件。由于SQLite本身是用C写的，而且体积很小，所以经常被集成到各种应用程序中，甚至在IOS和Android的APP中都可以集成。 Python中内置了SQLite3，连接到数据库后，需要打开游标Cursor，通过Cursor执行SQL语句，然后获得执行结果，Python定义了一套操作数据库的API接口，任何数据库要连接到Python，只需要提供符合Python标准的数据库驱动即可。试一下： ''' 遇到问题没人解答？小编创建了一个Python学习交流QQ群：579817333 寻找有志同道合的小伙伴，互帮互助,群里还有不错的视频学习教程和PDF电子书！ ''' #导入SQLite驱动： import sqlite3 #连接到SQlite数据库 #数据库文件是test.db，不存在，则自动创建 conn = sqlite3 . connect ( 'test.db' ) #创建一个cursor： cursor = conn . cursor ( ) #执行一条SQL语句：创建user表 cursor . execute ( 'create table user(id varchar(20) primary key,name varchar(20))' ) #插入一条记录： cursor . execute (

Combine multiple results as columns, not rows

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问题 I need to perform a number of counts on various tables in the database and I would like to combine those counts into a single result. Conider the following queries: SELECT 100 As SomeCount SELECT 200 As SomeOtherCount SELECT 300 As YetAnotherCount If I combine them using UNION , each of the results will be a row in the final result: SELECT 100 As SomeCount UNION SELECT 200 As SomeOtherCount UNION SELECT 300 As YetAnotherCount Output: > SomeCount > --------- > 100 > 200 > 300 What I want

Putting a list into a SQLite database in android

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问题 I have a List<Contact> and I'ld like to put it into a SQLite database. I've read some other posts saying you need to convert the List to a JSONArray and store it as a TEXT field in the array but I'm a beginner and this is all very confusing. So far I have a method as follows: public JSONArray void toJSON() { JSONArray jsonArray = new JSONArray(myList); return jsonArray } Then in my sqlite database I say: ContentValues values = new ContentValues(); values.put(KEY_CONTACTS, group.toJSON()); But

Use of temp tables in SQLite databases

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问题 I was browsing through the source code for Mendeley for Android by Martin Eve and saw that Temp tables are created along with the main tables by calling replace on the tables with _id. For example on the Collections table db.execSQL(COLLECTIONS_CREATE.replace(" (_id", "_TEMP (_id")); I guess it creates a new temporary table. Any more explanation on this would be great. Further on the data is first inserted to temp tables and later moved to main tables. I searched through SO and came across