Vb.net | how to filter/search database using datagridview

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Hi Coders,

Could you help find code for my problem. I want to filter my database using another table or datagridview, instead of the usual textbox.

Table 1:

(Column)Name	Surname
        Name1	Surname1
        Name2	Surname2
        Name3	Surname3

Table 2: (Search Parameter)

(Column)Name	Surname
        Name1	Surname1

Expected Output to Table 1 is below:

(Column)Name	Surname
        Name1   Surname1

Any help is appreciated. My below code only shows the first row.

What I have tried:

I have tried using for loop.

VB

For i as integer = 0 To dgv2.rowcount -1
Dim query as string = "SELECT * From db_table WHERE Name LIKE '%" & dgv2.rows(i).cells(0).value &"'"
Dim comm as new sqlcommand(query,conn)
dim adapter as new sqladapter(comm)
dim table as new datatable()
adapter.fill(table)
dgv1.datasource = table

Posted 1-Dec-19 20:34pm

jreypalars

Updated 1-Dec-19 23:39pm

Maciej Los

v2

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Richard Deeming 3-Dec-19 10:40am

Dim query as string = "SELECT * From db_table WHERE Name LIKE '%" & dgv2.rows(i).cells(0).value &"'"

Don't do it like that!

Your code is vulnerable to SQL Injection[^]. NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Everything you wanted to know about SQL injection (but were afraid to ask) | Troy Hunt[^]
How can I explain SQL injection without technical jargon? | Information Security Stack Exchange[^]
Query Parameterization Cheat Sheet | OWASP[^]

Const query As String = "SELECT * FROM db_table WHERE Name LIKE @Name"
Dim comm as New SqlCommand(query, conn)
comm.Parameters.AddWithValue("@Name", "%" & dgv2.rows(i).cells(0).value & "%")

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RickZeeland · Answer 1 · 2019-12-01T23:39:00

Solution 1

As you are using a DataTable, you could use an additional DataTable.Select for the Surname, see examples here:
https://www.dotnetperls.com/datatable-select-vbnet[^]
vb.net - Filter datatable with Like [SOLVED] | DaniWeb[^]

Posted 1-Dec-19 23:39pm

RickZeeland