winform中读写SQLite数据库例子(转)

时间：2015-09-17 19:36:28 阅读：288 评论：0 收藏：0 [点我收藏+]

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.Net SQLite数据库驱动以及System.Data.SQLite.dll下载最新地址：

SQLite管理工具下载地址：

App.config文件修改：

[html] view plain copy print ?

<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="DbSQLite" value="data source=|DataDirectory|DB.db3;Pooling=true;FailIfMissing=false"/>
</appSettings>
</configuration>

备注：如果开发环境是4.0，而System.Data.Sqlite是比较低的版本，则可能会弹出错误信息“混合模式程序集是针对“v2.0.50727”版的运行时生成的，在没有配置其他信息的情况下，无法在 4.0 运行时中加载该程序集”，解决方法是在上面加上：

</startup>

数据库读写助手SqliteHelper.cs

[csharp] view plain copy print ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;
public class SqliteHelper
{
public SqliteHelper()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
private static SQLiteConnection GetConnection()
{
string connStr = System.Configuration.ConfigurationManager.AppSettings["DbSQLite"].ToString();
SQLiteConnection conn = new SQLiteConnection(connStr);
conn.Open();
return conn;
}
public static int ExecuteSql(string sql)
{
using (SQLiteConnection conn = GetConnection())
{
var cmd = new SQLiteCommand(sql, conn);
return cmd.ExecuteNonQuery();
}
}
public static int ExecuteScalar(string sql)
{
using (SQLiteConnection conn = GetConnection())
{
var cmd = new SQLiteCommand(sql, conn);
object o = cmd.ExecuteScalar();
return int.Parse(o.ToString());
}
}
public static SQLiteDataReader ExecuteReader(string sql)
{
SQLiteConnection conn = GetConnection();
var cmd = new SQLiteCommand(sql, conn);
SQLiteDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
public static DataSet ExecDataSet(string sql)
{
using (SQLiteConnection conn = GetConnection())
{
var cmd = new SQLiteCommand(sql, conn);
SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
}
}

窗体中应用Form1.cs

[csharp] view plain copy print ?

//判断表是否存在，不存在则生成
int result = SqliteHelper.ExecuteScalar("SELECT COUNT(*) FROM sqlite_master where type=‘table‘ and name=‘tb‘");
if (result == 0)
{
//创建表
SqliteHelper.ExecuteSql("create table [tb] (id integer PRIMARY KEY autoincrement, [name] varchar(20), [createDate] datetime default (datetime(‘now‘, ‘localtime‘)))");
}
//插入一行数据
result = SqliteHelper.ExecuteSql("insert into [tb](name) values (‘Luck‘)");
if(result > 0)
{
string msg = "";
//读取数据
SQLiteDataReader dr = SqliteHelper.ExecuteReader("select * from [tb]");
if (dr.Read())
{
msg += dr[0] + "," + dr[1] + "," + dr[2];
}
MessageBox.Show(msg);
}

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原文地址：http://www.cnblogs.com/sukb0917/p/4817013.html

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