試圖執行一個SQL命令

Question

DataReader的努力在我的vb.net 頁面執行命令時拋出一個錯誤消息時收到錯誤，代碼拋出的錯誤是：

Dim connectionString As String 
Dim connection As SqlConnection 
Dim sql As String 

connectionString = \\\connection string\\\ 
connection = New SqlConnection(connectionString) 

sql = "select * from jb_jobs where city='Los Angeles' " 
connection.Open() 
Dim reader As SqlDataReader = sql.ExecuteReader() 

和錯誤是： 'ExecuteReader'不是'string'的成員 如何解決此問題？

Answer 1

嘗試添加此：

sql = "select * from jb_jobs where city='Los Angeles' "; 
    var sqlCommand = new SqlCommand(sql, connection); 
    sqlCommand.Connection.Open(); 
    var reader = sqlCommand.ExecuteReader(); 

Answer 2

添加此

connection.Open() 
Dim cmd as new SqlCommand(sql,connection)  
Dim reader As SqlDataReader = cmd.ExecuteReader() 

Answer 3

Dim cmd As SqlCommand = new SqlCommand(); 

cmd=(sql,connection); 

cmd.CommandType=CommandType.Text; 

Dim reader As SqlDataReader = cmd.ExecuteReader()