开发C#.net时使用的数据库操作类SqlHelp.cs

2019-11-14 15:47:29

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练习开发WPF程序的时候，是这样写的，虽然很简单，相必很多新手会用到，所以拿来共享一下，

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Configuration;using System.Data.SqlClient;using System.Data;namespace HRMSys.DAL{    static class SqlHelper    {        public static readonly string connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;        public static int ExecuteNonQuery(string sql,             params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                using (SqlCommand cmd = conn.CreateCommand())                {                    cmd.CommandText = sql;                    cmd.Parameters.AddRange(parameters);                    return cmd.ExecuteNonQuery();                }            }        }        public static object ExecuteScalar(string sql,            params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                using (SqlCommand cmd = conn.CreateCommand())                {                    cmd.CommandText = sql;                    cmd.Parameters.AddRange(parameters);                    return cmd.ExecuteScalar();                }            }        }        public static DataTable ExecuteDataTable(string sql,            params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                using (SqlCommand cmd = conn.CreateCommand())                {                    cmd.CommandText = sql;                    cmd.Parameters.AddRange(parameters);                    DataSet dataset = new DataSet();                    SqlDataAdapter adapter = new SqlDataAdapter(cmd);                    adapter.Fill(dataset);                    return dataset.Tables[0];                }            }        }        public static object FromDbValue(object value)        {            if (value == DBNull.Value)            {                return null;            }            else            {                return value;            }        }        public static object ToDbValue(object value)        {            if (value == null)            {                return DBNull.Value;            }            else            {                return value;            }        }    }}

　　在开发.net NVelocity小程序的时候，稍稍修改了一下

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Configuration;using System.Data.SqlClient;using System.Data;namespace _06NVelocityCURD{    public static class  SqlHelper    {        public static readonly string connstr =            ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;        public static SqlConnection OpenConnection()        {            SqlConnection conn = new SqlConnection(connstr);            conn.Open();            return conn;        }        public static int ExecuteNonQuery(string cmdText,            params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                return ExecuteNonQuery(conn, cmdText, parameters);            }        }        public static object ExecuteScalar(string cmdText,            params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                return ExecuteScalar(conn, cmdText, parameters);            }        }        public static DataTable ExecuteDataTable(string cmdText,            params SqlParameter[] parameters)        {            using (SqlConnection conn = new SqlConnection(connstr))            {                conn.Open();                return ExecuteDataTable(conn, cmdText, parameters);            }        }        public static int ExecuteNonQuery(SqlConnection conn,string cmdText,           params SqlParameter[] parameters)        {            using (SqlCommand cmd = conn.CreateCommand())            {                cmd.CommandText = cmdText;                cmd.Parameters.AddRange(parameters);                return cmd.ExecuteNonQuery();            }        }        public static object ExecuteScalar(SqlConnection conn, string cmdText,            params SqlParameter[] parameters)        {            using (SqlCommand cmd = conn.CreateCommand())            {                cmd.CommandText = cmdText;                cmd.Parameters.AddRange(parameters);                return cmd.ExecuteScalar();            }        }        public static DataTable ExecuteDataTable(SqlConnection conn, string cmdText,            params SqlParameter[] parameters)        {            using (SqlCommand cmd = conn.CreateCommand())            {                cmd.CommandText = cmdText;                cmd.Parameters.AddRange(parameters);                using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))                {                    DataTable dt = new DataTable();                    adapter.Fill(dt);                    return dt;                }            }        }        public static object ToDBValue(this object value)        {            return value == null ? DBNull.Value : value;        }        public static object FromDBValue(this object dbValue)        {            return dbValue == DBNull.Value ? null : dbValue;        }    }}

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