试图执行一个SQL命令

Question

DataReader的努力在我的vb.net 页面执行命令时抛出一个错误消息时收到错误，代码抛出的错误是：

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() 

和错误是： 'ExecuteReader'不是'string'的成员 如何解决此问题？

Answer 1

尝试添加此：

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()