How does Delphi implement multi condition query, ask for a high finger to teach me whether this prog

Do you checkbox1 have to be checked? If not, this error will occur. Otherwise, you can change the first sentence to a fixed one. Also, you can show your SQL to see if it's right.

Open the file that needs to be filtered. Our aim is to find out the data for the salary of 2000 and the reimbursement < 1000. If you choose to view them one by one, it is more inefficient, and if there is a lot of data, it will be even more difficult to find.

As shown in the figure, add the auxiliary condition area, and enter the formula, according to our requirements, enter the formula "=(c2>2000)*(d2<1000).", where C2 stands for "salary" and D2 stands for "reimbursement", and the conditions are selected according to your own needs in practice.

Select any cell, find the "Filter" column in "Data" in the toolbar, and select "Advanced".

In the "Condition area", select the auxiliary condition area created in step 2.

edit1 can't type anything to see if the property settings are correct (e.g. readonly and maxlength...).

if trim(<>''end; Where is it?

edit1 readonly is set to true?

Or enable is set to false, check it.

See if edit's enable is set to true.

What event are you writing about?

**Nothing else. It's just that the last few ifs are better to write else if (note that the sentence in front of else if can't have a semicolon).

edit1 has a property enable that you may have accidentally changed it to false, you see.

The grammar is not strict! SQL injection attacks are susceptible.

You're right, there's something wrong with that SQL statement.

According to your ** style, I'll change it for you like this.

where name=''Zhang San'' ');Note that Zhang San has two single quotation marks before and after, and the last single number is this string.

It took a few minutes to make your ** a little "pleasing to the eye", your kind of writing is actually "name = :name", I just know, but we never write it ourselves:

SQL statements.

You look at how your datasheet is designed.

In addition, try not to use the database reserved word,Name and the like to do table names、Field name tracking,It shows that there is a problem with your admin field.,But I can't see your field, and the password field uses the text type?

The username is not long enough with char(10).

Please paste the ** and the error message on it, which will help solve the problem.

Send it over and take a look, only the screenshot can't be seen :)

There should be no such thing as initial instantiation.

The corresponding component is not installed.