感谢软谋徐老师的 SQLHelper.as , 代码如下(本人有所改动):
- using System;
- using System.Collections;
- using System.Collections.Generic;
- using System.Configuration;
- using System.Data;
- using System.Data.SqlClient;
- using System.Linq;
- using System.Web;
- namespace DBDome
- {
- /// 此类为抽象类,
- /// 不允许实例化,在应用时直接调用即可
- /// </summary>
- public sealed class SqlHelper
- {
- private SqlHelper() { }
- /// <summary>
- /// 数据库连接字符串
- /// </summary>
- public static readonly string connectionString = ConfigurationManager.ConnectionStrings["con"].ToString();
- // Hashtable to store cached parameters
- private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
- #region//ExecteNonQuery方法
- /// <summary>
- ///执行一个不需要返回值的SqlCommand命令,通过指定专用的连接字符串。
- /// 使用参数数组形式提供参数列表
- /// </summary>
- /// <param name="connectionString">一个有效的数据库连接字符串</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
- public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlCommand cmd = new SqlCommand();
- using (SqlConnection conn = new SqlConnection(connectionString))
- {
- //通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
- PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
- int val = cmd.ExecuteNonQuery();
- //清空SqlCommand中的参数列表
- cmd.Parameters.Clear();
- return val;
- }
- }
- /// <summary>
- ///执行一个不需要返回值的SqlCommand命令,通过指定专用的连接字符串。
- /// 使用参数数组形式提供参数列表
- /// </summary>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
- public static int ExecteNonQuery(CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- return ExecteNonQuery(connectionString, cmdType, cmdText, commandParameters);
- }
- /// <summary>
- ///存储过程专用
- /// </summary>
- /// <param name="cmdText">存储过程的名字</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
- public static int ExecteNonQueryProducts(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);
- }
- /// <summary>
- ///Sql语句专用
- /// </summary>
- /// <param name="cmdText">T_Sql语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
- public static int ExecteNonQueryText(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);
- }
- #endregion
- #region//GetTable方法
- /// <summary>
- /// 执行一条返回结果集的SqlCommand,通过一个已经存在的数据库连接
- /// 使用参数数组提供参数
- /// </summary>
- /// <param name="connecttionString">一个现有的数据库连接</param>
- /// <param name="cmdTye">SqlCommand命令类型</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
- public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
- {
- SqlCommand cmd = new SqlCommand();
- DataSet ds = new DataSet();
- using (SqlConnection conn = new SqlConnection(connecttionString))
- {
- PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);
- SqlDataAdapter adapter = new SqlDataAdapter();
- adapter.SelectCommand = cmd;
- adapter.Fill(ds);
- }
- DataTableCollection table = ds.Tables;
- return table;
- }
- /// <summary>
- /// 执行一条返回结果集的SqlCommand,通过一个已经存在的数据库连接
- /// 使用参数数组提供参数
- /// </summary>
- /// <param name="cmdTye">SqlCommand命令类型</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
- public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters)
- {
- return GetTable(cmdTye, cmdText, commandParameters);
- }
- /// <summary>
- /// 存储过程专用
- /// </summary>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
- public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters)
- {
- return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);
- }
- /// <summary>
- /// Sql语句专用
- /// </summary>
- /// <param name="cmdText"> T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>
- public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters)
- {
- return GetTable(CommandType.Text, cmdText, commandParameters);
- }
- #endregion
- /// <summary>
- /// 为执行命令准备参数
- /// </summary>
- /// <param name="cmd">SqlCommand 命令</param>
- /// <param name="conn">已经存在的数据库连接</param>
- /// <param name="trans">数据库事物处理</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">Command text,T-SQL语句 例如 Select * from Products</param>
- /// <param name="cmdParms">返回带参数的命令</param>
- private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
- {
- //判断数据库连接状态
- if (conn.State != ConnectionState.Open)
- conn.Open();
- cmd.Connection = conn;
- cmd.CommandText = cmdText;
- //判断是否需要事物处理
- if (trans != null)
- cmd.Transaction = trans;
- cmd.CommandType = cmdType;
- if (cmdParms != null)
- {
- foreach (SqlParameter parm in cmdParms)
- cmd.Parameters.Add(parm);
- }
- }
- /// <summary>
- /// Execute a SqlCommand that returns a resultset against the database specified in the connection string
- /// using the provided parameters.
- /// </summary>
- /// <param name="connectionString">一个有效的数据库连接字符串</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>A SqlDataReader containing the results</returns>
- public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlCommand cmd = new SqlCommand();
- SqlConnection conn = new SqlConnection(connectionString);
- // we use a try/catch here because if the method throws an exception we want to
- // close the connection throw code, because no datareader will exist, hence the
- // commandBehaviour.CloseConnection will not work
- try
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
- SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
- cmd.Parameters.Clear();
- return rdr;
- }
- catch
- {
- conn.Close();
- throw;
- }
- }
- #region//ExecuteDataSet方法
- /// <summary>
- /// return a dataset
- /// </summary>
- /// <param name="connectionString">一个有效的数据库连接字符串</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>return a dataset</returns>
- public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlConnection conn = new SqlConnection(connectionString);
- SqlCommand cmd = new SqlCommand();
- try
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
- SqlDataAdapter da = new SqlDataAdapter();
- DataSet ds = new DataSet();
- da.SelectCommand = cmd;
- da.Fill(ds);
- return ds;
- }
- catch
- {
- conn.Close();
- throw;
- }
- }
- /// <summary>
- /// 返回一个DataSet
- /// </summary>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>return a dataset</returns>
- public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);
- }
- /// <summary>
- /// 返回一个DataSet
- /// </summary>
- /// <param name="cmdText">存储过程的名字</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>return a dataset</returns>
- public static DataSet ExecuteDataSetProducts(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
- }
- /// <summary>
- /// 返回一个DataSet
- /// </summary>
- /// <param name="cmdText">T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>return a dataset</returns>
- public static DataSet ExecuteDataSetText(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);
- }
- public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlConnection conn = new SqlConnection(connectionString);
- SqlCommand cmd = new SqlCommand();
- try
- {
- PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
- SqlDataAdapter da = new SqlDataAdapter();
- DataSet ds = new DataSet();
- da.SelectCommand = cmd;
- da.Fill(ds);
- DataView dv = ds.Tables[0].DefaultView;
- dv.Sort = sortExpression + " " + direction;
- return dv;
- }
- catch
- {
- conn.Close();
- throw;
- }
- }
- #endregion
- #region // ExecuteScalar方法
- /// <summary>
- /// 返回第一行的第一列
- /// </summary>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个对象</returns>
- public static object ExecuteScalar(CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters);
- }
- /// <summary>
- /// 返回第一行的第一列存储过程专用
- /// </summary>
- /// <param name="cmdText">存储过程的名字</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个对象</returns>
- public static object ExecuteScalarProducts(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters);
- }
- /// <summary>
- /// 返回第一行的第一列Sql语句专用
- /// </summary>
- /// <param name="cmdText">者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>返回一个对象</returns>
- public static object ExecuteScalarText(string cmdText, SqlParameter[] commandParameters)
- {
- return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters);
- }
- /// <summary>
- /// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string
- /// using the provided parameters.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
- /// </remarks>
- /// <param name="connectionString">一个有效的数据库连接字符串</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
- public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlCommand cmd = new SqlCommand();
- using (SqlConnection connection = new SqlConnection(connectionString))
- {
- PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
- object val = cmd.ExecuteScalar();
- cmd.Parameters.Clear();
- return val;
- }
- }
- /// <summary>
- /// Execute a SqlCommand that returns the first column of the first record against an existing database connection
- /// using the provided parameters.
- /// </summary>
- /// <remarks>
- /// e.g.:
- /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
- /// </remarks>
- /// <param name="connectionString">一个有效的数据库连接字符串</param>
- /// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句, 等等。)</param>
- /// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>
- /// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
- /// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>
- public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, SqlParameter[] commandParameters)
- {
- SqlCommand cmd = new SqlCommand();
- PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
- object val = cmd.ExecuteScalar();
- cmd.Parameters.Clear();
- return val;
- }
- #endregion
- /// <summary>
- /// add parameter array to the cache
- /// </summary>
- /// <param name="cacheKey">Key to the parameter cache</param>
- /// <param name="cmdParms">an array of SqlParamters to be cached</param>
- public static void CacheParameters(string cacheKey, SqlParameter[] commandParameters)
- {
- parmCache[cacheKey] = commandParameters;
- }
- /// <summary>
- /// Retrieve cached parameters
- /// </summary>
- /// <param name="cacheKey">key used to lookup parameters</param>
- /// <returns>Cached SqlParamters array</returns>
- public static SqlParameter[] GetCachedParameters(string cacheKey)
- {
- SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
- if (cachedParms == null)
- return null;
- SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
- for (int i = 0, j = cachedParms.Length; i < j; i++)
- clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
- return clonedParms;
- }
- /// <summary>
- /// 检查是否存在
- /// </summary>
- /// <param name="strSql">Sql语句</param>
- /// <returns>bool结果</returns>
- public static bool Exists(string strSql)
- {
- int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null));
- if (cmdresult == 0)
- {
- return false;
- }
- else
- {
- return true;
- }
- }
- /// <summary>
- /// 检查是否存在
- /// </summary>
- /// <param name="strSql">Sql语句</param>
- /// <param name="cmdParms">参数</param>
- /// <returns>bool结果</returns>
- public static bool Exists(string strSql, SqlParameter[] cmdParms)
- {
- int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));
- if (cmdresult == 0)
- {
- return false;
- }
- else
- {
- return true;
- }
- }
- }
- }
本篇博客只涉及到添加数据 (insert into) 并陆续的更新其他 SQL 操作, 本人希望封装一个全套基本的 SQL 操作。在以后如果从事后端可以在此扩展 , 不喜勿喷。
本人希望用 SqlParameter 的方式来构建 T-SQL
一 : 构建基本的 T-SQL( 没有 SqlParameter 参数注入 )
- using DBDome.model;
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Reflection;
- using System.Text;
- namespace DBDome.com
- {
- /// <summary>
- /// SQL构建器(还没与赋值)
- /// </summary>
- public sealed class SQL_Structure
- {
- private SQL_Structure() { }
- /// <summary>
- /// 添加一个数据的T-SQL的构成
- /// </summary>
- /// <typeparam name="T"></typeparam>
- /// <param name="model"></param>
- /// <returns></returns>
- public static string ADD_T_SQL<T>( T model ) where T : BaseModel
- {
- string base_add = @"insert into [{0}] ({1}) values ({2})";//表名 , 列明 , 对应的值
- Type model_type = model.GetType();
- string[] arr = model_type.Name.Split(new char[] { '.' });
- string table_name = arr[arr.Length - 1];//获得表的名称
- PropertyInfo[] p_intos = model_type.GetProperties();
- StringBuilder table_field_name = new StringBuilder();
- StringBuilder table_field_value = new StringBuilder();
- PropertyInfo item = null;
- for (int i = 0; i < p_intos.Length; i++)
- {
- item = p_intos[i];
- if (item.Name != "id")//不应添加主键
- {
- table_field_name.Append(item.Name + ",");
- table_field_value.Append("@" + item.Name + ",");
- }
- }
- return String.Format(base_add, table_name, table_field_name.ToString().Substring(0, table_field_name.ToString().Length-1), table_field_value.ToString().Substring(0,table_field_value.ToString().Length-1));
- }
- }
- }
二 : 好了我现在构造与 SQL 表映射的模型类
①,所有 model 的基类:
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- namespace DBDome.model
- {
- public abstract class BaseModel
- {
- protected int _id;
- /// <summary>
- /// 主键ID号
- /// </summary>
- public virtual int id
- {
- get { return this._id; }
- set { this._id = value; }
- }
- }
- }
② , 继承 model 的一个类 User 也是我的一个 SQL 表名
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- namespace DBDome.model
- {
- public sealed class User : BaseModel
- {
- public string name { get; set; }
- public short sex{ get; set; }
- public int lv{ get; set; }
- public string username{ get; set; }
- public string userpwd{ get; set; }
- }
- }
三 , 我们添加一条数据 , 需要构建参数 SqlParameter[]
- using DBDome.model;
- using System;
- using System.Collections.Generic;
- using System.Data.SqlClient;
- using System.Linq;
- using System.Reflection;
- using System.Text;
- using System.Data;
- namespace DBDome.com
- {
- /// <summary>
- /// SqlParameter 构建
- /// </summary>
- public sealed class SqlParameter_Structure
- {
- private SqlParameter_Structure() { }
- /// <summary>
- /// 构建T-SQL参数 ADD
- /// </summary>
- /// <typeparam name="T"></typeparam>
- /// <param name="model"></param>
- /// <returns></returns>
- public static SqlParameter[] ADD_T_SQL<T>(T model) where T : BaseModel
- {
- Type model_type = model.GetType();
- PropertyInfo[] p_intos = model_type.GetProperties();
- SqlParameter[] sql_param = new SqlParameter[p_intos.Length - 1];//不需要主键
- PropertyInfo item = null;
- string p_name = "";
- SqlParameter cell = null;
- int j = 0;
- for (int i = 0; i < p_intos.Length; i++)
- {
- item = p_intos[i];
- p_name = item.Name;
- if (p_name == "id") continue;
- // Console.WriteLine("字段 {0} 的类型为 {1} ", p_name ,item.PropertyType);
- cell = new SqlParameter(p_name, SqlParameter_Structure.Get_SqlDbType_SqlType(item.PropertyType));
- cell.Value = item.GetValue(model, null);
- sql_param[j] = cell;
- j++;
- }
- return sql_param;
- }
- private static SqlDbType Get_SqlDbType_SqlType(Type cshaper)
- {
- string[] arr = cshaper.ToString().Split(new char[] { '.' });
- string toLow = arr[arr.Length - 1].ToLower();
- switch (toLow)
- {
- case "string":
- return SqlDbType.NVarChar;
- break;
- case "int16":
- return SqlDbType.Bit;
- break;
- case "int32":
- return SqlDbType.Int;
- break;
- default:
- throw new Exception(String.Format("T-SQL参数没有配对的类型 {0}" ,cshaper));
- break;
- }
- }
- }
- }
来源: http://www.bubuko.com/infodetail-2150042.html