SQL statement with MFC

Good Day All,

Really I tried to retrieve data from my Access DB but I struggle with the syntax when I need to attach an variables with the SELECT statement like the following :


CString X("2");

CString SQL1;

SQL= "SELECT Col1 from Table where Col2="+X; // its works fine no problems although that its declared as CString and Col2 is integer in the DB

but my struggling when I want to attach 2 variables I tried many times and I have different types of errors somtimes from the compiler and sometimes from the ACCESS "there is missing in your expression"

Please any one can help me and I really appreciate that

Hijjawi

What do you mean "attach 2 variables"?

Code:

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CString X("2");

CString SQL1;

SQL1= "SELECT Col1 from Table where Col2="+X;

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This doesn't compile for me (after correcting the typo)

Try this (for two variables)

Code:

---

CString X("2");
CString Y("3");

CString SQL1;

SQL1 = CString("SELECT Col1 from Table where Col2=") + X + Y;

---

Quote:

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Originally Posted by JohnW@Wessex

Code:

---

CString X("2");

CString SQL1;

SQL1= "SELECT Col1 from Table where Col2="+X;

---

This doesn't compile for me (after correcting the typo)

Try this (for two variables)

Code:

---

CString X("2");
CString Y("3");

CString SQL1;

SQL1 = CString("SELECT Col1 from Table where Col2=") + X + Y;

---

---

That would give him Col2 = 23. I don't think that's what he means.

Thanks for all,

But I mean I want to attach 2 variables to match them with two column's values like:

CString SQL = " SELECT Col1 from Table where Col2= Variable1 and Col2= Variable2 "

My tries were:

CString SQL = " SELECT Col1 from Table where Col2="+X AND Col3="+Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2=+X AND Col3=+Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2='+X' "AND" Col3='+Y' "; // failed

CString SQL = " SELECT Col1 from Table where Col2= AND Col3="+X +Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2=' "+X+" ' AND Col3=' "+Y+ " ' "; // failed

I think my problem with the syntax code not anything else.

Any help please

Quote:

---

Originally Posted by hijjawi

Thanks for all,

But I mean I want to attach 2 variables to match them with two column's values like:

CString SQL = " SELECT Col1 from Table where Col2= Variable1 and Col2= Variable2 "

My tries were:

CString SQL = " SELECT Col1 from Table where Col2="+X AND Col3="+Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2=+X AND Col3=+Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2='+X' "AND" Col3='+Y' "; // failed

CString SQL = " SELECT Col1 from Table where Col2= AND Col3="+X +Y "; // failed

CString SQL = " SELECT Col1 from Table where Col2=' "+X+" ' AND Col3=' "+Y+ " ' "; // failed

I think my problem with the syntax code not anything else.

Any help please

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CString SQL;
SQL.Format("SELECT Col1 from table where Col2 = %d AND Col3 = %d", x, y);

Dear GCDEF,


Thank you very much its work now .

thanks alot and best regards