初始化CRICS

Common/SQLHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Data.SqlClient;
+
+namespace Common
+{
+    public static class SqlHelper
+    {
+        //连接字符串
+        private static readonly string connStr = ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;
+        /// <summary>
+        /// 1.执行增、删、改的方法：ExecuteNonQuery
+        /// </summary>
+        /// <param name="sql"></param>
+        /// <param name="pms"></param>
+        /// <returns></returns>
+        public static int ExecuteNonQuery(string sql, params SqlParameter[] pms)
+        {
+            using (SqlConnection con = new SqlConnection(connStr))
+            {
+                using (SqlCommand cmd = new SqlCommand(sql, con))
+                {
+                    if (pms != null)
+                    {
+                        cmd.Parameters.AddRange(pms);
+                    }
+                    con.Open();
+                    return cmd.ExecuteNonQuery();
+                }
+            }
+        }
+        /// <summary>
+        /// 2.封装一个执行返回单个对象的方法：ExecuteScalar()
+        /// </summary>
+        /// <param name="sql"></param>
+        /// <param name="pms"></param>
+        /// <returns></returns>
+        public static object ExecuteScalar(string sql, params SqlParameter[] pms)
+        {
+            using (SqlConnection con = new SqlConnection(connStr))
+            {
+                using (SqlCommand cmd = new SqlCommand(sql, con))
+                {
+                    if (pms != null)
+                    {
+                        cmd.Parameters.AddRange(pms);
+                    }
+                    con.Open();
+                    return cmd.ExecuteScalar();
+                }
+            }
+        }
+        /// <summary>
+        /// 3.执行查询多行多列的数据的方法：ExecuteReader
+        /// </summary>
+        /// <param name="sql"></param>
+        /// <param name="pms"></param>
+        /// <returns></returns>
+        public static SqlDataReader ExecuteReader(string sql, params SqlParameter[] pms)
+        {
+            SqlConnection con = new SqlConnection(connStr);
+            using (SqlCommand cmd = new SqlCommand(sql, con))
+            {
+                if (pms != null)
+                {
+                    cmd.Parameters.AddRange(pms);
+                }
+                try
+                {
+                    con.Open();
+                    return cmd.ExecuteReader(CommandBehavior.CloseConnection);
+                }
+                catch (Exception)
+                {
+                    con.Close();
+                    con.Dispose();
+                    throw;
+                }
+            }
+        }
+        /// <summary>
+        /// 4.执行返回DataTable的方法
+        /// </summary>
+        /// <param name="sql"></param>
+        /// <param name="pms"></param>
+        /// <returns></returns>
+        public static DataTable ExecuteDataTable(string sql, params SqlParameter[] pms)
+        {
+            DataTable dt = new DataTable();
+            using (SqlDataAdapter adapter = new SqlDataAdapter(sql, connStr))
+            {
+                if (pms != null)
+                {
+                    adapter.SelectCommand.Parameters.AddRange(pms);
+                }
+                adapter.Fill(dt);
+            }
+            return dt;
+        }
+    }
+}