SQLite操作类Sqlite Dot Net即SQLite.SQLiteConnection的常用方法

本类定义了对SQLite数据库的常用操作，包括创建数据库连接，创建表，对表记录的增、删、改、查，可满足常见的数据库操作需求。

在创建数据库连接时，构造SQLiteConnection对象时，指定参数storeDateTimeAsTicks为true，则日期类型将按照ticks来存储，即保存为BIGINT类型。

类定义如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace XXXWebService.Common
{
    /// <summary>
    /// Sqlite Dot Net
    /// </summary>
    public class SDNConn
    {
        /// <summary>
        /// 创建SQLite连接
        /// .db文件不存在时创建，存在时读写，日期类型存为ticks
        /// </summary>
        /// <param name="sDbPath">.db文件路径</param>
        /// <returns>数据库的连接</returns>
        public static SDNConn CreateInstance(string sDbPath)
        {
            return new SDNConn() { Connection = new SQLite.SQLiteConnection(sDbPath, SQLite.SQLiteOpenFlags.ReadWrite | SQLite.SQLiteOpenFlags.Create | SQLite.SQLiteOpenFlags.SharedCache, true) };
        }
       /// <summary>
       /// 数据库连接
       /// </summary>
        public SQLite.SQLiteConnection Connection { get; set; }
        /// <summary>
        /// 创建表
        /// </summary>
        /// <typeparam name="T">表结构</typeparam>
        /// <param name="createFlags">创建标记</param>
        public void CreateTable<T>(SQLite.CreateFlags createFlags = SQLite.CreateFlags.None)
        {
            Connection.CreateTable<T>(createFlags);
        }
        /// <summary>
        /// 根据主键查询记录是否存在
        /// </summary>
        /// <typeparam name="T">类型（表结构）</typeparam>
        /// <param name="aPrimaryKey">主键值</param>
        /// <returns>是否存在</returns>
        public bool Exists<T>(object aPrimaryKey) where T : new()
        {
            return null != Connection.Find<T>(aPrimaryKey);
        }
        /// <summary>
        /// 根据主键获取记录
        /// </summary>
        /// <typeparam name="T">类型（表结构）</typeparam>
        /// <param name="aPrimaryKey">主键值</param>
        /// <returns>记录对象（一条）</returns>
        public T Get<T>(object aPrimaryKey) where T : new()
        {
            return Connection.Get<T>(aPrimaryKey);
        }
        /// <summary>
        /// 根据条件查询记录
        /// </summary>
        /// <typeparam name="T">类型（表结构）</typeparam>
        /// <param name="query">查询条件（支持字符串格式化）</param>
        /// <param name="args">参数值</param>
        /// <returns>记录集合</returns>
        public List<T> Query<T>(string query, params object[] args) where T : new()
        {
            return Connection.Query<T>(query, args);
        }
        /// <summary>
        /// 根据评分查询记录
        /// </summary>
        /// <typeparam name="T">类型（表结构）</typeparam>
        /// <param name="aPrimaryKey">主键值</param>
        /// <returns>记录（一条）</returns>
        public T Select<T>(object aPrimaryKey) where T : new()
        {
            return Connection.Find<T>(aPrimaryKey);
        }
        /// <summary>
        /// 插入新记录
        /// </summary>
        /// <param name="aRecord">记录对象（单条或多条）</param>
        /// <returns>受影响记录条数</returns>
        public int Insert(object aRecord)
        {
            return Connection.Insert(aRecord);
        }
        /// <summary>
        /// 插入或修改记录
        /// </summary>
        /// <param name="aRecord">记录对象（单条或多条）</param>
        /// <returns>受影响记录条数</returns>
        public int InsertOrReplace(object aRecord)
        {
            int i = Connection.InsertOrReplace(aRecord);
            Connection.Commit();
            return i;
        }
        /// <summary>
        /// 删除记录
        /// </summary>
        /// <param name="aRecord">记录对象（单条或多条）</param>
        /// <returns>受影响记录条数</returns>
        public int Delete(object aRecord)
        {
            return Connection.Delete(aRecord);
        }
        /// <summary>
        /// 更新记录
        /// </summary>
        /// <param name="aRecord">记录对象（单条或多条）</param>
        /// <returns>受影响记录条数</returns>
        public int Update(object aRecord)
        {
            return Connection.Update(aRecord);
        }
    }
}