C# 使用sqlite 轻量级数据库
一 准备工作
sqlite3.exe 下载地址：http://www.sqlite.org/download.html 下载"sqlite-shell-win32-x86-
3070800.zip" 就OK了Precompiled Binaries For Windows
sqlite-shell-win32-x86-3070800.zip
(248.28 KiB)
system.data.sqlite.dll 下载地址: http://www.dllzj.com/Down_System.Data.SQLite.DLL.html 这个dll
用于Visual Studio 项目中引用
二，试用sqlite3.exe
解压sqlite-shell-win32-x86-3070800.zip 到F:\jonse\DownLoads\sqlLite 目录下
开始-->运行-->cmd
>F:
>cd F:\jonse\DownLoads\sqlLite
>sqlite3 myDB.db (如果myDB.db不存在，则创建之；若存在，则打开它)
>create table test(id int,name varchar(20),remark varchar(200)); (创建test表，三列：
id,name,remark)
>insert into test select 1,'name1','remark1' union select 2,'name2','remark2'; (暂时插入2行数据)
>.mode column (显示列模式)
>.headers on (显示列头信息)
>select * from test; (查询所有的数据)
>select ifnull(max(id),0) as MaxID from test; (查询test表最大的ID值)
三, C# 使用sqlite
在VS2010的项目引用中添加System.Data.SQLite.dll (这个在准备工作中已经下载好的)
(1),新建一个SqlLiteHelper.cs 的类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SQLite;
using System.Data.Common;
namespace JonseTest
{
public abstract class SqlLiteHelper
{
public static string ConnSqlLiteDbPath = string.Empty;
public static string ConnString
{
get
{
return string.Format(@"Data Source={0}", ConnSqlLiteDbPath);
}
}
// 取datatable
public static DataTable GetDataTable(out string sError,string sSQL)
{
DataTable dt = null;
sError = string.Empty;
try
{
SQLiteConnection conn = new SQLiteConnection(ConnString);
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.CommandText = sSQL;
cmd.Connection = conn;
SQLiteDataAdapter dao = new SQLiteDataAdapter(cmd);
dt = new DataTable();
dao.Fill(dt);
}
catch (Exception ex)
{
sError = ex.Message;
}
return dt;
}
// 取某个单一的元素
public static object GetSingle(out string sError, string sSQL)
{
DataTable dt = GetDataTable(out sError, sSQL);
if (dt != null && dt.Rows.Count > 0)
{
return dt.Rows[0][0];
}
return null;
}
// 取最大的ID
public static Int32 GetMaxID(out string sError, string sKeyField,string sTableName)
{
DataTable dt = GetDataTable(out sError, "select ifnull(max([" + sKeyField + "]),0) as
MaxID from [" + sTableName + "]");
if (dt != null && dt.Rows.Count > 0)
{
return Convert.ToInt32(dt.Rows[0][0].ToString());
}
return 0;
}
// 执行insert,update,delete 动作，也可以使用事务
public static bool UpdateData(out string sError, string sSQL,bool bUseTransaction=false)
{
int iResult = 0;
sError = string.Empty;
if (!bUseTransaction)
{
try
{
&nbs
补充：软件开发 , C# ,
