Oledb data Adapter using C# and Ms Access

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Hi.

This is my program.

C#

try
{
con.open();
{
da=new oledbdataadapter("Select modelname from table where type='gate' and min<='"+textbox1.text+"' and max>='"+textbox1.text+"'",con);
ds.Fill(da,"main");
if(tables[0].rows.count>1)
{
datagridview1.datasource=ds;
datagridview1.datamember=main;
}
else
{
datagridview1.datasource=null;
}

Here i given min and max range for every model.If i give any number in textbox1 , it should compare the values between min and max range and gives the result..

For example;

Model Name : zeta,
min=200
max=250
type=gate

If i give 210, it should give respective model name which have comes in that range.

but it displays all fields which have 2,1,0,21,20,210,10.

please help me for this issue.

Posted 24-Sep-13 22:10pm

Member 10295714

Updated 24-Sep-13 22:23pm

Abey Thomas

v2

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Thanks7872 25-Sep-13 4:17am

Don't repost the question. Wait for some one to answer your question and follow the original thread only.

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Maciej Los · Answer 1 · 2013-09-24T23:15:00

General tips/hints:

1) In MS Access min and max is the name of function. It is strongly recommended to not use it as a name of fields, because some of words (for example type, table) are reserved words.
SQL Reserved Words (Access Developer Reference[^]
Problem names and reserved words in Access[^]

2) Do not concatenate query string in code. Use parameters!
PARAMETERS Declaration (Microsoft Access SQL)[^]
Everything About Using Parameters from Code (ADO & ADODB)[^]

Finally, your query should looks like:

SQL

Parameters [myVal] Integer
SELECT modelname
FROM [table] 
WHERE [type]='gate' and [min]<=[myVal] and [max]>=[myVal]

But, as i mentioned above, i would strongly recommend you to change the name of fields!

How to call above query? Have a look at OleDbCommand.Parameters[^] property.

Madhu Nair · Answer 2 · 2013-09-24T22:27:00

Solution 1

Try this way. it should work assuming that data types for min & max are integer

da=new oledbdataadapter("Select modelname from table where type='gate' and " + textbox1.text +" between min and max",con);

Posted 24-Sep-13 22:27pm

Madhu Nair