Delphi dbgrid row cannot be located for updating

Navigating through a dataset is done with the same set of methods as described in the "Behind data in datasets" chapter.

In general ADOQuery component should not be used when editing takes place.

The data-access components: Data Source, ADOConnection along with ADOQuery (instead of the ADOTable) and one data-aware component like DBGrid is all we need.

As already explained, by using the Object Inspector set the link between those components as follows: method.

To specify a parameter in a query, use a colon (:) preceding a parameter name.

At design-time use the Object Inspector to set the SQL property as follows: .

We can set the values of the parameters in the Params collection at design time via the Parameters dialog box, but most of the time we will be changing the parameters at runtime.

The Parameters dialog can be used to specify the datatypes and default values of parameters used in a query.

Let's make a query that can be used to fetch the rows from various tables in a database.

Locate(Second Row Id, 'Id', []) then begin Client Data Set1. Free Bookmark(Bookmark); end; finally Data Source1.

These SQL statements can either be DDL (Data Definition Language) statements such as CREATE TABLE, ALTER INDEX, and so forth, or they can be DML (Data Manipulation Language) statements, such as SELECT, UPDATE, and DELETE.

To modify the parameter value, we use either the Params property or Param By Name method.

For example, given the SQL statement as above, at run-time we could use the following code: As like when working with the ADOTable component the ADOQuery returns a set or records from a table (or two or more).

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Many problems can be resolved by upgrading your Connector/ODBC drivers to the latest available release.

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