SQLite使用

首先从https://www.sqlite.org/download.html下载

下载完成后，将文件全部解压到D:sqlite

运行sqlite3.exe查看是否正常

下载可视化工具 https://github.com/sqlitebrowser/sqlitebrowser/releases

利用可视化工具创建表结构

准备工作完成，接下来就是C#操作SQLite

在NuGet包管理工具中添加所需的dll

在config文件中配置数据库连接字符串

  <connectionStrings>
    <add name="sqliteConn" connectionString="Data Source=....dataBasedbAreaInfo.db;Pooling=true;FailIfMissing=false"  providerName="System.Data.SQLite" />
  </connectionStrings>

接下来是一个简单的SQLiteHelper

    public class SQLiteHelper
    {
        private static string connString = System.Configuration.ConfigurationManager.ConnectionStrings["sqliteConn"].ToString();
        private static SQLiteConnection conn;

        static SQLiteHelper()
        {
            conn = new SQLiteConnection(connString);
        }


        /// <summary>
        /// 查询数据,返回DataSet
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static DataSet QuerySql(string sql)
        {
            DataSet ds = new DataSet();
            try
            {
                using (SQLiteDataAdapter adapter = new SQLiteDataAdapter(sql, conn))
                {
                    conn.Open();
                    adapter.Fill(ds);
                    conn.Close();
                }
            }
            catch { }
            return ds;
        }

        /// <summary>
        /// 执行单条SQL语句
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static bool ExecuteSql(string sql)
        {
            bool result = false;
            try
            {
                using (SQLiteCommand cmd = new SQLiteCommand(conn))
                {
                    conn.Open();
                    cmd.CommandText = sql;
                    result = cmd.ExecuteNonQuery() > 0;
                    conn.Close();
                }
            }
            catch { }
            return result;
        }

        /// <summary>
        /// 事务执行多条SQL语句
        /// </summary>
        /// <param name="lstSql"></param>
        /// <returns></returns>
        public static bool ExecuteSql(List<string> lstSql)
        {
            bool result = false;
            try
            {
                using (SQLiteCommand cmd = new SQLiteCommand(conn))
                {
                    conn.Open();
                    DbTransaction trans = conn.BeginTransaction();
                    foreach (var sql in lstSql)
                    {
                        cmd.CommandText = sql;
                        cmd.ExecuteNonQuery();
                    }
                    trans.Commit();
                    result = true;
                    conn.Close();
                }
            }
            catch { }
            return result;
        }
    }

两个简单的调用例子

查询

        /// <summary>
        /// 获取区域名称
        /// </summary>
        /// <param name="areaCode">区域编号</param>
        /// <returns></returns>
        public string GetAreaName(string areaCode)
        {
            string result = string.Empty; ;
            string sql = "select AreaName from AreaInfo where AreaCode='" + areaCode + "'";
            DataSet ds = SQLiteHelper.QuerySql(sql);
            if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count == 1)
            {
                result = ds.Tables[0].Rows[0]["AreaName"].ToString();
            }
            return result;
        }

删除和新增

        public void InsertAreaSource()
        {
            string sql = "delete from AreaInfo";
            SQLiteHelper.ExecuteSql(sql);

            AreaInfo areaInfo = new AreaInfo();
            List<Area> lstArea = areaInfo.GetAreaInfoFromWeb();
            List<string> lstSql = new List<string>();
            foreach (Area item in lstArea)
            {
                sql = "INSERT INTO AreaInfo(AreaCode,AreaName) VALUES('" + item.AreaCode + "','" + item.AreaName + "')";
                lstSql.Add(sql);
            }
            SQLiteHelper.ExecuteSql(lstSql);
        }