sqlite

insert into database from excel sheet that has different no. of columns

由 旧城冷巷雨未停 提交于 2020-01-30 10:56:21
问题 Using c# and sqlite Pretty much exactly as the title. I want to insert into a database an excel sheet that has a different number of columns than the database. I suspect I need to use an if case to check if the columns are as the same as the db but I'm not sure what the line of code for it would be. Mostly everything I have found are different to what I'm looking for. I can get the data set to display the excel based on the bottom but private void ImportExcelbutton_Click(object sender,

连接 sqlite的帮助文件

由 て烟熏妆下的殇ゞ 提交于 2020-01-30 09:55:54
using System; using System.Collections; using System.Collections.Specialized; using System.Data; using System.Configuration; using System.Data.SQLite; namespace Maticsoft.DBUtility { /// <summary> /// Copyright (C) 2011 Maticsoft /// 数据访问基础类(基于SQLite) /// 可以用户可以修改满足自己项目的需要。 /// </summary> public abstract class DbHelperSQLite { //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库. public static string connectionString = PubConstant.ConnectionString; public DbHelperSQLite() { } #region 公用方法 public static int GetMaxID(string FieldName, string TableName) { string strsql = "select max(" +

How do I get around not being able to parse a table name into a python sqlite query?

由 别等时光非礼了梦想. 提交于 2020-01-30 08:30:27
问题 I have a python3 program that I'm making which uses a sqlite database with several tables, I want to create a selector module to allow me to chose which table to pull data from. I have found out that I can't use parameter substitution for a table name as shown bellow, so I'm looking for some alternative methods to accomplish this. c.execute("SELECT * FROM ? ", DB) Any ideas? 回答1: Right. You can not use parameter substitution to specify the table. So instead you must do string manipulation: c

SQLiteException: no such column: basal (code 1)

由 自闭症网瘾萝莉.ら 提交于 2020-01-30 06:31:26
问题 I'm working with databases and I have the following DataBaseHandling class: public class DatabaseHandler extends SQLiteOpenHelper { // All Static variables // Database Version private static final int DATABASE_VERSION = 4; // Database Name private static final String DATABASE_MEASURES = "measuresDataBase"; // Measures table name private static final String TABLE_MEASURES = "measures"; // Measures Table Columns names private static final String KEY_ID = "id"; private static final String KEY

SQLiteException: no such column: basal (code 1)

由 有些话、适合烂在心里 提交于 2020-01-30 06:31:12
问题 I'm working with databases and I have the following DataBaseHandling class: public class DatabaseHandler extends SQLiteOpenHelper { // All Static variables // Database Version private static final int DATABASE_VERSION = 4; // Database Name private static final String DATABASE_MEASURES = "measuresDataBase"; // Measures table name private static final String TABLE_MEASURES = "measures"; // Measures Table Columns names private static final String KEY_ID = "id"; private static final String KEY

What exactly does SQLite's “NO ACTION” foreign key constraint do and how is it different from “RESTRICT”?

由 冷暖自知 提交于 2020-01-30 04:47:09
问题 The documentation says: Configuring "NO ACTION" means just that: when a parent key is modified or deleted from the database, no special action is taken. My first interpretation of this sentence was "if parent key is modified or deleted, then this modification is done and no other action is taken" thus not preserving database integrity, which lead to some confusion. But my testing showed, that if I try to delete a parent key (if a child key still exists), I do get an exception (

What exactly does SQLite's “NO ACTION” foreign key constraint do and how is it different from “RESTRICT”?

由 核能气质少年 提交于 2020-01-30 04:46:26
问题 The documentation says: Configuring "NO ACTION" means just that: when a parent key is modified or deleted from the database, no special action is taken. My first interpretation of this sentence was "if parent key is modified or deleted, then this modification is done and no other action is taken" thus not preserving database integrity, which lead to some confusion. But my testing showed, that if I try to delete a parent key (if a child key still exists), I do get an exception (

sqlite使用步骤

由 谁说胖子不能爱 提交于 2020-01-30 02:57:08
1.加载驱动 Class.forName(“org.sqlite.JDBC”) 2.创建连接 Connection cn=null; cn=DriverManager.getConnection("jdbc:sqlite:Student.db); 3.Statement stmt=null; stmt=cn.createStatement(); stmt.excuteUpdate(“语句”); 加载驱动，用驱动器取得连接，用连接创造statement实例化对象，用stmt执行语句 来源： CSDN 作者： MXiao13 链接： https://blog.csdn.net/qq_41588302/article/details/104109526

sqlite数据库操作（杂但全）

由 北城余情 提交于 2020-01-29 12:09:00
package study; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Scanner; import javax.naming.spi.DirStateFactory.Result; public class Sqlite { public static void main(String[] args) throws SQLException, ClassNotFoundException { // TODO Auto-generated method stub Connection cn=null; Statement st=null; //加载驱动 Class.forName("org.sqlite.JDBC"); //连接数据库 cn=DriverManager.getConnection("jdbc:sqlite:Student.db"); //实例化statement st=cn.createStatement(); //输入语句 //Scanner sc=new Scanner(System

System.Data.SQLite from NuGet, interop dll not copied to output directory

由 北城以北 提交于 2020-01-29 10:21:52
问题 I installed System.Data.SQLite Core (x86/x64) from NuGet. It built without warnings but threw System.DllNotFoundException regarding SQLite.Interop.dll . I rigged my projects to copy the SQLite.Interop.dll from under the NuGet package's directory to the output directory, and now it runs without the exception. Why didn't the NuGet package configure my projects to put the appropriate interop dll in the output directory? It seems like it should be able to do that. I'm new to interop and I
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