一步一步建立ASP.NET MVC5程序[Repository+Autofac+Automapper+SqlSugar](二)
前言：
在本系列第一篇《一步一步建立ASP.NET MVC5程序[Repository+Autofac+Automapper+SqlSugar](一)》中，我爲你們介紹了搭建空白解決方案以及在此解決方案中建立目錄和對應的項目。本篇將和你們一塊兒學習在項目中使用Nuget引入.NET對應的MySql.Data程序包，以及使用傳統的Ado.NET鏈接MySQL數據庫，實現一個簡單的查詢並將數據轉換成泛型對象的操做。html
本篇知識要點
- Nuget程序包管理工具；
- MySQLHelper幫助類庫；
- Ado.NET
- 泛型
建立實體及工具類
- 在TsBlog.Domain項目中新建文件夾，命名爲：Entities，再在此文件夾中添加實體類，命名爲：Post.cs，打開Post.cs文件，建立如下屬性/成員：
using System;
namespace TsBlog.Domain.Entities
{
/// <summary>
/// 博文實體類
/// </summary>
public class Post
{
/// <summary>
/// ID
/// </summary>
public int Id { get; set; }
/// <summary>
/// 標題
/// </summary>
public string Title { get; set; }
/// <summary>
/// 內容
/// </summary>
public string Content { get; set; }
/// <summary>
/// 做者ID
/// </summary>
public string AuthorId { get; set; }
/// <summary>
/// 做者姓名
/// </summary>
public string AuthorName { get; set; }
/// <summary>
/// 建立時間
/// </summary>
public DateTime CreatedAt { get; set; }
/// <summary>
/// 發佈時間
/// </summary>
public DateTime PublishedAt { get; set; }
/// <summary>
/// 是否標識已刪除
/// </summary>
public bool IsDeleted { get; set; }
/// <summary>
/// 是否容許展現
/// </summary>
public bool AllowShow { get; set; }
/// <summary>
/// 瀏覽量
/// </summary>
public int ViewCount { get; set; }
}
}
如圖:jquery
- 在項目TsBlog.Repositories中建立新的類，命名爲：MySqlHelper.cs，此類用以封裝.NET對MySQL數據庫的底層操做，並在MySqlHelper.cs文件中添加以下代碼：
using MySql.Data.MySqlClient;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
namespace TsBlog.Repositories
{
/// <summary>
/// 數據訪問抽象基礎類
/// </summary>
public sealed class MySqlHelper
{
//數據庫鏈接字符串(web.config來配置)，能夠動態更改connectionString支持多數據庫.
public static string connectionString = "鏈接字符串";
private MySqlHelper()
{
}
#region 公用方法
/// <summary>
/// 獲得最大值
/// </summary>
/// <param name="FieldName"></param>
/// <param name="TableName"></param>
/// <returns></returns>
public static int GetMaxID(string FieldName, string TableName)
{
string strsql = "select max(" + FieldName + ")+1 from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
/// <summary>
/// 是否存在
/// </summary>
/// <param name="strSql"></param>
/// <returns></returns>
public static bool Exists(string strSql)
{
object obj = GetSingle(strSql);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// 是否存在（基於MySqlParameter）
/// </summary>
/// <param name="strSql"></param>
/// <param name="cmdParms"></param>
/// <returns></returns>
public static bool Exists(string strSql, params MySqlParameter[] cmdParms)
{
object obj = GetSingle(strSql, cmdParms);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
#endregion
#region 執行簡單SQL語句
/// <summary>
/// 執行SQL語句，返回影響的記錄數
/// </summary>
/// <param name="SQLString">SQL語句</param>
/// <returns>影響的記錄數</returns>
public static int ExecuteSql(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static int ExecuteSqlByTime(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">多條SQL語句</param>
public static int ExecuteSqlTran(List<String> SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return 0;
}
}
}
/// <summary>
/// 執行帶一個存儲過程參數的的SQL語句。
/// </summary>
/// <param name="SQLString">SQL語句</param>
/// <param name="content">參數內容,好比一個字段是格式複雜的文章，有特殊符號，能夠經過這個方式添加</param>
/// <returns>影響的記錄數</returns>
public static int ExecuteSql(string SQLString, string content)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 執行帶一個存儲過程參數的的SQL語句。
/// </summary>
/// <param name="SQLString">SQL語句</param>
/// <param name="content">參數內容,好比一個字段是格式複雜的文章，有特殊符號，能夠經過這個方式添加</param>
/// <returns>影響的記錄數</returns>
public static object ExecuteSqlGet(string SQLString, string content)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 向數據庫裏插入圖像格式的字段(和上面狀況相似的另外一種實例)
/// </summary>
/// <param name="strSQL">SQL語句</param>
/// <param name="fs">圖像字節,數據庫的字段類型爲image的狀況</param>
/// <returns>影響的記錄數</returns>
public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 執行一條計算查詢結果語句，返回查詢結果（object）。
/// </summary>
/// <param name="SQLString">計算查詢結果語句</param>
/// <returns>查詢結果（object）</returns>
public static object GetSingle(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static object GetSingle(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法後，必定要對MySqlDataReader進行Close )
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string strSQL)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
try
{
connection.Open();
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
/// <summary>
/// 執行查詢語句，返回DataSet
/// </summary>
/// <param name="SQLString">查詢語句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public static DataSet Query(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = Times;
command.Fill(ds, "ds");
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 執行帶參數的SQL語句
/// <summary>
/// 執行SQL語句，返回影響的記錄數
/// </summary>
/// <param name="SQLString">SQL語句</param>
/// <returns>影響的記錄數</returns>
public static int ExecuteSql(string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的MySqlParameter[]）</param>
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
//循環
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的MySqlParameter[]）</param>
public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
int count = 0;
//循環
foreach (CommandInfo myDE in cmdList)
{
string cmdText = myDE.CommandText;
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
{
if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
{
trans.Rollback();
return 0;
}
object obj = cmd.ExecuteScalar();
bool isHave = false;
if (obj == null && obj == DBNull.Value)
{
isHave = false;
}
isHave = Convert.ToInt32(obj) > 0;
if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
{
trans.Rollback();
return 0;
}
if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
{
trans.Rollback();
return 0;
}
continue;
}
int val = cmd.ExecuteNonQuery();
count += val;
if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
{
trans.Rollback();
return 0;
}
cmd.Parameters.Clear();
}
trans.Commit();
return count;
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的MySqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
int indentity = 0;
//循環
foreach (CommandInfo myDE in SQLStringList)
{
string cmdText = myDE.CommandText;
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 執行多條SQL語句，實現數據庫事務。
/// </summary>
/// <param name="SQLStringList">SQL語句的哈希表（key爲sql語句，value是該語句的MySqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
int indentity = 0;
//循環
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (MySqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 執行一條計算查詢結果語句，返回查詢結果（object）。
/// </summary>
/// <param name="SQLString">計算查詢結果語句</param>
/// <returns>查詢結果（object）</returns>
public static object GetSingle(string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法後，必定要對MySqlDataReader進行Close )
/// </summary>
/// <param name="strSQL">查詢語句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)
{
MySqlConnection connection = new MySqlConnection(connectionString);
MySqlCommand cmd = new MySqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (MySql.Data.MySqlClient.MySqlException e)
{
throw e;
}
// finally
// {
// cmd.Dispose();
// connection.Close();
// }
}
/// <summary>
/// 執行查詢語句，返回DataSet
/// </summary>
/// <param name="SQLString">查詢語句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString, params MySqlParameter[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySql.Data.MySqlClient.MySqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
}
public enum EffentNextType
{
/// <summary>
/// 對其餘語句無任何影響
/// </summary>
None,
/// <summary>
/// 當前語句必須爲"select count(1) from .."格式，若是存在則繼續執行，不存在回滾事務
/// </summary>
WhenHaveContine,
/// <summary>
/// 當前語句必須爲"select count(1) from .."格式，若是不存在則繼續執行，存在回滾事務
/// </summary>
WhenNoHaveContine,
/// <summary>
/// 當前語句影響到的行數必須大於0，不然回滾事務
/// </summary>
ExcuteEffectRows,
/// <summary>
/// 引起事件-當前語句必須爲"select count(1) from .."格式，若是不存在則繼續執行，存在回滾事務
/// </summary>
SolicitationEvent
}
public class CommandInfo
{
public object ShareObject = null;
public object OriginalData = null;
event EventHandler _solicitationEvent;
public event EventHandler SolicitationEvent
{
add
{
_solicitationEvent += value;
}
remove
{
_solicitationEvent -= value;
}
}
public void OnSolicitationEvent()
{
if (_solicitationEvent != null)
{
_solicitationEvent(this, new EventArgs());
}
}
public string CommandText;
public System.Data.Common.DbParameter[] Parameters;
public EffentNextType EffentNextType = EffentNextType.None;
public CommandInfo()
{
}
public CommandInfo(string sqlText, SqlParameter[] para)
{
this.CommandText = sqlText;
this.Parameters = para;
}
public CommandInfo(string sqlText, SqlParameter[] para, EffentNextType type)
{
this.CommandText = sqlText;
this.Parameters = para;
this.EffentNextType = type;
}
}
}
添加代碼後，Visual Studio編輯器會提示以下圖的錯誤，如圖：web
說明在項目中尚未引入MySql.Data這個程序包，如今咱們會再一次用到Nuget程序包管理工具，在此項目的引用[References]選擇上右鍵單擊，選擇[Manage Nuget Packages]，進入到項目的Nuget程序包管理界面，搜索MySql.Data，在查找到的結果中選擇MySql.Data，同時選擇版本(本系列使用的是MySql.Data 6.9.9)，點擊"Install"進行安裝，完成後，咱們回到MySqlHelper.cs文件，引入MySql.Data.MySqlClient的命名空間：sql
using MySql.Data.MySqlClient;
到此，MySqlHelper.cs這個MySql的幫助類庫就建立完成了。但爲了本文後續用的數據轉換，咱們再在此項目中建立一個新的類文件，命名爲：DataConverter.cs，將此類寫成靜態的類並建立一個從DataTable轉換到泛型對象的靜態擴展方法，編寫以下代碼：數據庫
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
namespace TsBlog.Repositories
{
public static class DataConverter
{
public static List<T> ToList<T>(this DataTable table) where T : class, new()
{
var obj = new T();
var tType = obj.GetType();
var list = new List<T>();
//Define what attributes to be read from the class
const BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
//Read Attribute Names and Types
var objFieldNames = typeof(T).GetProperties(flags)
.Select(item => new
{
item.Name,
Type = Nullable.GetUnderlyingType(item.PropertyType) ?? item.PropertyType
}).ToList();
//Read Datatable column names and types
var dtlFieldNames = table.Columns.Cast<DataColumn>()
.Select(item => new
{
Name = item.ColumnName,
Type = item.DataType
}).ToList();
foreach (var row in table.Rows.Cast<DataRow>())
{
foreach (var prop in objFieldNames)
{
if (!dtlFieldNames.Any(x => x.Name.Equals(prop.Name, StringComparison.CurrentCultureIgnoreCase)))
{
continue;
}
var propertyInfo = tType.GetProperty(prop.Name);
var rowValue = row[prop.Name];
if (propertyInfo == null) continue;
var t = Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType;
var safeValue = (rowValue == null || DBNull.Value.Equals(rowValue)) ? null : Convert.ChangeType(rowValue, t);
propertyInfo.SetValue(obj, safeValue, null);
}
list.Add(obj);
}
return list;
}
}
}
到此，咱們的準備工做完成得差很少了，接下來建立數據讀取相關的操做。mvc
建立Repository類
在項目[TsBlog.Repositories]中，添加一個新的類文件，命名爲：PostRepository.cs ，咱們在這個類文件中進行關於博文的數據庫讀寫等操做(注:最開始咱們以Ado.net的方式來操做數據庫，ORM將在後續的文章中逐步引用並完成項目的重構和優化)，代碼以下：app
PostRepository.cs編輯器
using MySql.Data.MySqlClient;
using System.Collections.Generic;
using System.Linq;
using TsBlog.Domain.Entities;
namespace TsBlog.Repositories
{
/// <summary>
/// POST表的數據庫操做類
/// </summary>
public class PostRepository
{
/// <summary>
/// 根據ID查詢
/// </summary>
/// <param name="id">Post ID</param>
/// <returns></returns>
public Post FindById(int id)
{
var ds = MySqlHelper.Query("SELECT * FROM tb_post WHERE Id=@Id", new MySqlParameter("@Id",id));
var entity = ds.Tables[0].ToList<Post>().FirstOrDefault();
return entity;
}
/// <summary>
/// 查詢全部數據
/// </summary>
/// <returns></returns>
public List<Post> FindAll()
{
var ds = MySqlHelper.Query("SELECT * FROM tb_post");
return ds.Tables[0].ToList<Post>();
}
}
}
完善View層
修改控制器
首先，咱們進入到項目[TsBlog.Frontend]，打開控制器[HomeController.cs]，爲咱們測試數據讀取功能添加一個Action，命名爲：Post，修改後的HomeController.cs文件代碼爲:ide
HomeController.cs工具
using System.Web.Mvc;
using TsBlog.Repositories;
namespace TsBlog.Frontend.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
public ActionResult Post()
{
var postRepository = new PostRepository();
var post = postRepository.FindById(1);
return View(post);
}
}
}
注意：引用TsBlog.Domain和TsBlog.Repositories這兩個程序集
建立視圖
再在視圖中添加對應的視圖Post.cshtml文件：
@model TsBlog.Domain.Entities.Post
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Post find by id test</title>
</head>
<body>
<div>
<p>Post id:@Model.Id</p>
<p>Post Title:@Model.Title</p>
</div>
</body>
</html>
數據庫鏈接
在Web.coinfig文件添加對應的數據庫鏈接字符串：
<connectionStrings>
<add name="TsBlogMySQLDb" connectionString="Server=localhost;Database=tsblog;UID=root;Password=123456;Allow User Variables=True;AllowZeroDateTime=True;ConvertZeroDateTime=True" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
如圖：
修改項目[TsBlog.Repositories]中的MySqlHelper.cs文件的數據庫鏈接配置：
public static string ConnectionString = ConfigurationManager.ConnectionStrings["TsBlogMySQLDb"].ConnectionString;
建立數據庫和表
打開MySql管理工具，執行如下Sql腳本，建立數據庫、數據表以及導入測試數據：
CREATE DATABASE IF NOT EXISTS `tsblog` USE `tsblog`; /*Table structure for table `tb_post` */ DROP TABLE IF EXISTS `tb_post`; CREATE TABLE `tb_post` ( `Id` int(12) NOT NULL AUTO_INCREMENT, `Title` varchar(255) DEFAULT '' COMMENT '標題', `Content` text COMMENT '內容', `AuthorId` int(6) DEFAULT '0' COMMENT '做者ID', `AuthorName` varchar(50) DEFAULT '' COMMENT '做者姓名', `CreatedAt` datetime DEFAULT NULL COMMENT '建立時間', `PublishedAt` datetime DEFAULT NULL COMMENT '發佈時間', `IsDeleted` bit(1) DEFAULT b'0' COMMENT '是否標識已刪除[0:否,1:是],默認值:0', `AllowShow` bit(1) DEFAULT b'1' COMMENT '是否容許展現[0:否,1:是],默認值:1', `ViewCount` int(10) DEFAULT '0' COMMENT '瀏覽量', PRIMARY KEY (`Id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; /*Data for the table `tb_post` */ insert into `tb_post`(`Id`,`Title`,`Content`,`AuthorId`,`AuthorName`,`CreatedAt`,`PublishedAt`,`IsDeleted`,`AllowShow`,`ViewCount`) values (1,'Title','Clean content',0,'',NULL,NULL,'\0','1',0);
到這裏，看上去咱們的配置都完成了，將項目[TsBlog.Frontend]設置爲啓動項，按F5運行，會獲得以下的錯誤：
是由於上一篇中把多餘的程序包給移除了，包括jquery，但ASP.NET MVC 5自動爲咱們開啓了壓縮功能，因此報錯。先暫時把壓縮功能關閉掉，打開Global.asax，咱們看到的文件代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
namespace TsBlog.Frontend
{
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
}
}
}
註釋掉壓縮配置語句：
using System.Web.Mvc;
using System.Web.Routing;
namespace TsBlog.Frontend
{
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
//BundleConfig.RegisterBundles(BundleTable.Bundles);
}
}
}
好，再按F5運行程序，打開地址:http://localhost:54739/home/post，若是獲得如圖的界面：
那麼，基於Ado.net的MySql數據鏈接成功了。
這篇文章一口氣寫下來實在是夠長的啊，側邊的滾動條細成小蠻腰了，哈哈。。。
若是你喜歡本文，請點個贊以支持做者後續寫得更好！！！
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本文同步發表至碼友網《一步一步建立ASP.NET MVC5程序[Repository+Autofac+Automapper+SqlSugar](二)》
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