App.config
<?xml version="1.0"?> <configuration> <appSettings> <!--FailIfMissing=false表示数据库不存在时就会自动创建--> <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 useLegacyV2RuntimeActivationPolicy="true"><supportedRuntime version="v4.0"/>
</startup>
数据库读写助手SqliteHelper.cs
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
//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); }