using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Linq;
using System.Text;
using Dapper;
using PaiXie.Utils;
namespace PaiXie.Pos.Client.Core
{
public class Data<T> where T : class
{
#region 构造函数 private static Data<T> _instance;
public static Data<T> GetInstance()
{
if (_instance == null)
{
_instance = new Data<T>();
}
return _instance;
} #endregion /// <summary>
/// 分页列表
/// </summary>
/// <param name="data"></param>
/// <param name="model"></param>
/// <param name="count"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public List<T> GetQueryManyForPage(SelectBuilder data, T model, out int count, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
string sqlStr = Db.GetInstance().GetSqlForSelectBuilder(data);
string sqlStrCount = Db.GetInstance().GetSqlForTotalBuilder(data);
List<T> list = context.Query<T>(sqlStr, model, transaction).ToList();
count = ZConvert.StrToInt(context.ExecuteScalar(sqlStrCount, model, transaction), );
return list;
}
/// <summary>
/// 添加
/// </summary>
/// <param name="query"></param>
/// <param name="model"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public int Add(string query, T model, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
// query += " ; select last_insert_rowid() newid";
// string id = context.ExecuteScalar(query, model, transaction).ToString();
// return ZConvert.StrToInt(id, 0);
int id = context.Execute(query, model, transaction);
return id;
} /// <summary>
/// 修改
/// </summary>
/// <param name="query"></param>
/// <param name="model"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public int Update(string query, T model, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
int id = context.Execute(query, model, transaction);
return id;
}
/// <summary>
/// 删除
/// </summary>
/// <param name="tablename"></param>
/// <param name="wheresql"></param>
/// <param name="model"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public int Delete(string tablename, string wheresql, T model, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
string query = "DELETE FROM " + tablename + " WHERE " + wheresql;
int id = context.Execute(query, model, transaction);
return id;
}
/// <summary>
/// 获取单个实体
/// </summary>
/// <param name="tablename"></param>
/// <param name="wheresql"></param>
/// <param name="model"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public T GetModel(string tablename, string wheresql, T model, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
string query = "SELECT * FROM " + tablename + " WHERE " + wheresql + " LIMIT 0,1";
T obj = context.Query<T>(query, model, transaction).SingleOrDefault();
return obj;
} /// <summary>
/// 实体列表
/// </summary>
/// <param name="query"></param>
/// <param name="model"></param>
/// <param name="context"></param>
/// <param name="transaction"></param>
/// <returns></returns>
public List<T> GetModelList(string query, T model, SQLiteConnection context = null, IDbTransaction transaction = null)
{
if (context == null) context = Db.GetInstance().Context();
List<T> list = context.Query<T>(query, model, transaction).ToList();
return list;
} }
}
 using System;
using System.Collections.Generic;
using System.Data.SQLite;
using System.Linq;
using System.Text;
using Dapper;
using System.Windows.Forms;
namespace PaiXie.Pos.Client.Core {
public class Db { #region 构造函数 private static Db _instance;
public static Db GetInstance() {
if (_instance == null) {
_instance = new Db();
}
return _instance;
} #endregion #region Context
public SQLiteConnection Context() {
SQLiteConnectionStringBuilder sb = new SQLiteConnectionStringBuilder();
sb.DataSource =
@"//10.0.0.105/db/DB.s3db";
// Application.StartupPath + @"\Data.dll";//DB.db3
SQLiteConnection con = new SQLiteConnection(sb.ToString());
return con;
}
#endregion #region 分页语句拼接
public string GetSqlForSelectBuilder(SelectBuilder data) {
var sql = "";
sql = "select " + data.Select;
sql += " from " + data.From;
if (data.WhereSql.Length > )
sql += " where " + data.WhereSql;
if (data.GroupBy.Length > )
sql += " group by " + data.GroupBy;
if (data.Having.Length > )
sql += " having " + data.Having;
if (data.OrderBy.Length > )
sql += " order by " + data.OrderBy;
if (data.PagingItemsPerPage >
&& data.PagingCurrentPage >
) {
sql += string.Format(" limit {0} offset {1}", data.PagingItemsPerPage, ((data.PagingCurrentPage * data.PagingItemsPerPage) - data.PagingItemsPerPage + ) - );
}
return sql;
}
public string GetSqlForTotalBuilder(SelectBuilder data) {
var sql = "";
sql = "select count(*)";
sql += " from " + data.From;
if (data.WhereSql.Length > )
sql += " where " + data.WhereSql;
return sql;
}
#endregion } #region SelectBuilder
public class SelectBuilder {
public int PagingCurrentPage { get; set; }
public int PagingItemsPerPage { get; set; } private string _Having = "";
public string Having {
set { _Having = value; }
get { return _Having; }
} private string _GroupBy = "";
public string GroupBy {
set { _GroupBy = value; }
get { return _GroupBy; }
} private string _OrderBy = "";
public string OrderBy {
set { _OrderBy = value; }
get { return _OrderBy; }
} private string _From = "";
public string From {
set { _From = value; }
get { return _From; }
} private string _Select="";
public string Select {
set { _Select = value; }
get { return _Select; }
} private string _WhereSql="";
public string WhereSql {
set { _WhereSql = value; }
get { return _WhereSql; }
} }
#endregion
}

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