KJD_WebService/AllBase/SqliteHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SQLite;
using System.Configuration;
using System.IO;
using System.Data.Common;

namespace AllBase
{
    public class SqliteHelper
    {
        //获取连接字符串

        private static readonly string str = "data source =DB.dll"; //ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;

        public static void CreateProductTable()
        {
            DBConfig.DBName = "DB.dll";
            DBConfig.CreateDbFile();
            DBConfig.CreateProductTable();
        }
         
        /// <summary>
        /// 做增删改的功能
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="ps">sql语句中的参数</param>
        /// <returns>受影响的行数</returns>
        public static int ExecuteNonQuery(string sql, params SQLiteParameter[] ps)
        {
            try
            {
                //连接数据库
                using (SQLiteConnection con = new SQLiteConnection(str))
                {
                    using (SQLiteCommand cmd = new SQLiteCommand(sql, con))
                    {
                        con.Open();//打开数据库
                        if (ps != null)
                        {
                            cmd.Parameters.AddRange(ps);//参数
                        }
                        return cmd.ExecuteNonQuery();
                    }
                }
            }
            catch 
            {
            }
            return 0;
        }

        public static int ExecuteNonQueryInsert(string sql, SQLiteCommand cmd)
        {
            try
            {
                 cmd.CommandText = sql;
                 return  cmd.ExecuteNonQuery();
            }
            catch(Exception ex)
            {
            }
            return 0;
        }

        /// <summary>
        /// 做增删改的功能
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="ps">sql语句中的参数</param>
        /// <returns>受影响的行数</returns>
        public static int BatchExecuteNonQuery(List<string> lst)
        {
            try
            {
                using (SQLiteConnection con = new SQLiteConnection(str))
                {
                    using (SQLiteCommand cmd = new SQLiteCommand())
                    {
                        con.Open();
                        cmd.Connection = con;
                        using (var transaction = con.BeginTransaction())
                        {
                            for (int i = 0; i < lst.Count; i++)
                            {
                                ExecuteNonQueryInsert(lst[i],cmd);
                            }
                            transaction.Commit();
                        }
                        con.Close();
                    }
                }
            }
            catch 
            {
 
            }
            return 0;
        }
        /// <summary>
        /// 去掉SQL中的特殊字符
        /// </summary>
        /// <param name="value">字符串</param>
        /// <returns></returns>
        public static string ReplaceSqlx(string value)
        {
            if (string.IsNullOrEmpty(value))
                return null;
            value = value.Replace("\\", "\\\\");
            value = value.Replace("'", "''");
            //value = value.Replace("\"", "\\\"");
            return value;
        }

        /// <summary>
        /// 首行首列
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="ps">sql语句中的参数</param>
        /// <returns>返回的是首行首列</returns>
        public static object ExecuteScalar(string sql, params SQLiteParameter[] ps)
        {
            using (SQLiteConnection con = new SQLiteConnection(str))
            {
                using (SQLiteCommand cmd = new SQLiteCommand(sql, con))
                {
                    con.Open();
                    if (ps != null)
                    {
                        cmd.Parameters.AddRange(ps);
                    }
                    return cmd.ExecuteScalar();
                }
            }
        }
        /// <summary>
        /// 查询的
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="ps">sql语句中的参数</param>
        /// <returns>返回的是SqliteDataReader</returns>
        public static SQLiteDataReader ExecuteReader(string sql, params SQLiteParameter[] ps)
        {
            SQLiteConnection con = new SQLiteConnection(str);
            using (SQLiteCommand cmd = new SQLiteCommand(sql, con))
            {
                if (ps != null)
                {
                    cmd.Parameters.AddRange(ps);
                }
                try
                {
                    con.Open();
                    return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
                }
                catch (Exception ex)
                {
                    con.Close();
                    con.Dispose();
                    throw ex;
                }
            }
        }
        /// <summary>
        /// 查询数据
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="ps">sql语句中的参数</param>
        /// <returns>返回表</returns>
        public static DataTable ExecuteTable(string sql, params SQLiteParameter[] ps)
        {
            try
            {
            DataTable dt = new DataTable();
            using (SQLiteDataAdapter sda=new SQLiteDataAdapter(sql,str))
            {
                if (ps!=null)
                {
                    sda.SelectCommand.Parameters.AddRange(ps);
                }
                sda.Fill(dt);
                return dt;
            }
            }
            catch
            {
            }
            return new DataTable();
        }
    }

    public class DBConfig
    {
        public static string DBName = "DB.dll"; //数据库的名字

        public static string DataSource
        {
            get
            {
                string databaseFile = GetDatabaseFile();
                return string.Format("data source={0}", databaseFile);
            }
        }
        public static void CreateDirectory(string dir)
        {
            if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
        }

        public static bool CreateDbFile()
        {
            string databaseFile = GetDatabaseFile();
            try
            {
                CreateDirectory(Path.GetDirectoryName(databaseFile));
                if (!File.Exists(databaseFile))
                {
                    SQLiteConnection.CreateFile(databaseFile);
                }
                return true;
            }
            catch (Exception ex)
            {
                throw new Exception("新建数据库文件" + databaseFile + "失败：" + ex.Message);
            }
        }

        private static string GetDatabaseFile()
        {
            string databaseFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,DBName);
            return databaseFile;
        }

        public static void CreateProductTable()
        {
            string sql = "CREATE TABLE if not exists Product (content STRING, fromid STRING PRIMARY KEY);";
            try
            {
                SqliteHelper.ExecuteNonQuery(sql);
            }
            catch
            {
            }
        }
    }
}