63 lines
1.9 KiB
C#
63 lines
1.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace DatabaseClient
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{
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public abstract class DBClient
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{
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/// <summary>
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/// 根据连接字符串连接
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/// </summary>
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/// <param name="connString">连接字符串</param>
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public abstract void Connect(string connString);
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/// <summary>
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/// 执行sql查询语句，返回DataTable
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/// </summary>
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/// <param name="sql">查询sql字符串</param>
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/// <returns></returns>
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public abstract DataTable ExecQuery(string sql);
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/// <summary>
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/// 执行sql非查询语句，返回执行结果
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/// </summary>
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/// <param name="sql">非查询sql字符串</param>
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/// <returns></returns>
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public abstract int ExecNonQuery(string sql);
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/// <summary>
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/// 分页，将原始表分成子表。约束为当前页数和每页记录数
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/// </summary>
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/// <typeparam name="T">泛型类型</typeparam>
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/// <param name="originList">原始表</param>
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/// <param name="pageSize">每页记录数</param>
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/// <param name="currentPage">当前页数</param>
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/// <returns></returns>
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public static List<T> SplitePage<T>(List<T> originList,int pageSize,int currentPage)
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{
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List<T> resList = new List<T>();
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var numAll = originList.Count;
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var numPage = numAll / pageSize + 1;
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var start = (currentPage - 1) * pageSize;
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var end = start + pageSize;
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for (int i = 0; i < originList.Count; i++)
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{
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var origin = originList[i];
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if (i >= start && i < end)
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{
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resList.Add(origin);
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}
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}
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return resList;
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}
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}
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}
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