Inserting Data into a Table

Introduction

You can insert a single row or several rows in a table. To insert several rows the SQL statement needs to be called in a loop until the condition is satisfied.

Basic procedure

The high level steps for inserting a row into a table are shown here:

1. Configure the SQL statement.

2. Execute the statement.

Detailed steps

An INSERT query adds data to the database. The example shown here inserts a new record into the countries database.

Configure the SQL statement

1. Declare the necessary literals as shown and instantiate an object of the RSqlStatement class.

   _LIT(kQueryString,"INSERT INTO countries (name, population) 
   VALUES (:value1, :value2);");
   _LIT(kValue1,":value1);
   _LIT(kValue2,":value2");
   _LIT(kItaly,"Italy");
   
   RSqlStatement myStatement;

2. Prepare the SQL statement for execution.

   TInt err;
   err = myStatement.Prepare(countriesDatabase,kQueryString); // prepare

3. Get the index of each of the parameters with the given name and bind it with the text and integer value respectively.

   TInt index1 = myStatement.ParameterIndex(kValue1); // index
   TInt index2 = myStatement.ParameterIndex(kValue2);
   err = myStatement.BindText(index1,kItaly);
   err = myStatement.BindInt(index2,59); // bind

Execute the statement

Execute the SQL statement to insert a record.

err = myStatement.Exec();// execute

Close the SQL statement.

err = myStatement.Close();// close

Note

To add several rows to a data table you need to call an INSERT statement within a loop. The following example inserts rows containing numbers 1 to 10 into the countries database. Steps 1 and 2 of the above list remain the same. The remaining steps are as shown below:

• Get the index of the parameter.

  TInt index1 = myStatement.ParameterIndex(kValue1); // index

• Iterate the loop 10 times by binding the integer value of the variable i with the parameter. Then execute the INSERT statement to insert a new record into the table. Finally, call the Reset() function to reset the SQL statement and make it ready for the next execution.

  for(TInt i=1;i<=10;i++)
         {
         err = myStatement.BindInt(index1,i);
         err = myStatement.Exec(); // execute
         err = myStatement.Reset()
         }

See also

Querying a database

Inserting a Row into a Table - This document

Deleting Rows from a Table

Reading to a Buffer

Reading to Memory

Reading to a Data Stream

Writing to a Data Stream

Performing Scalar Queries