在實(shí)際開(kāi)發(fā)中，我們不會(huì)直接使用拼寫(xiě)SQL語(yǔ)句的方法進(jìn)行數(shù)據(jù)庫(kù)操作，而是使用參數(shù)化的方法進(jìn)行數(shù)據(jù)庫(kù)操作，這樣做的好處很多，不僅提高了程序的健壯性，同時(shí)也避免的SQL注入的問(wèn)題。在這里，筆者為初學(xué)者提供一個(gè)SQLHelper模板，希望對(duì)新手有所啟發(fā)。

public static class SqlHelper{public static readonly string strConn = ConfigurationManager.ConnectionStrings["strConn"].ConnectionString;public static int ExecuteNonQuery(string cmdText, params SqlParameter[] parameters){using (SqlConnection conn = new SqlConnection(strConn)){conn.Open();return ExecuteNonQuery(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(string cmdText, params SqlParameter[] parameters){using (SqlConnection conn = new SqlConnection(strConn)){conn.Open();return ExecuteScalar(conn, cmdText, parameters);}}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(string cmdText, params SqlParameter[] parameters){using (SqlConnection conn = new SqlConnection(strConn)){conn.Open();return ExecuteDataTable(conn, cmdText, parameters);}}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;}}}/// <summary>/// 存數(shù)據(jù)時(shí)防止為空/// </summary>/// <param name="value"></param>/// <returns></returns>public static object ToDbValue(this object value){return value == null ? DBNull.Value : value;}/// <summary>/// 取數(shù)據(jù)時(shí)防止為空/// </summary>/// <param name="value"></param>/// <returns></returns>public static object FromDbValue(this object value){return value == DBNull.Value ? null : value;}}

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轉(zhuǎn)載于:https://www.cnblogs.com/hippieZhou/p/4486171.html

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