Question

I have 3 table how to get the value of 3rd table by using join in MySql
table1

      RowID     UserID    RoleID    
    1            1       2  
    2           171      3  

table2

 RowID   RoleID   PermissionID
    1        2            2
    2        2            3
    3        3            14
    4        3            15

table3:

PermissionID    PermissionName
        2             Edit organisation
        3             Delete organisation
        14            Create group
        15            Edit group
        16            Delete group

Here I will know only the UserID, if suppose the UserID is 171, then I should get the roleid(3) from table1 and get PermissionID(14,15) from table 2 and then get the PermissionName(Create group, Edit group) from table 3 and I have to store it in a list. How can I do it. I am using c# and mysql. Thanks

Answer 1

SQL Query to select from DB:

SELECT p.PermissionID, p.PermissionName
FROM users u
INNER JOIN roles r ON r.RoleID = u.RoleID
INNER JOIN permissions p ON p.PermissionID = r.PermissionID

Next step: (But use ExecuteReader() instead of ExecuteNonQuery())

• MSDN: ExecuteReader() example
• Executing an SQL statement in C#?