The Table (Using Database Operations)

Using Database Operations

The Table

A table OTD represents a database table. It consists of fields and methods. Fields correspond to the columns of a table while methods are the operations that you can apply to the OTD. This allows you to perform query, update, insert, and delete SQL operations in a table. The ability to update via a resultset is called “Updatable Resultset”, which is a feature supported by this adapter.

By default, the Table OTD has UpdatableConcurrency and ScrollTypeForwardOnly. Normally you do not have to change the default setting.

The type of result returned by the select() method can be specified using:

SetConcurrencytoUpdatable
SetConcurrencytoReadOnly
SetScrollTypetoForwardOnly
SetScrollTypetoScrollSensitive
SetScrollTypetoInsensitive

The Query (Select) Operation

To perform a query operation on a table:

Execute the select() method with the “where” clause specified if necessary.

Loop through the ResultSet using the next() method.

Process the return record within a while() loop.

For example:

package prjSybase_JCDjcdALL;


public class jcdTableSelect
{

    public com.stc.codegen.logger.Logger logger;

    public com.stc.codegen.alerter.Alerter alerter;

    public com.stc.codegen.util.CollaborationContext collabContext;

    public com.stc.codegen.util.TypeConverter typeConverter;

    public void receive( com.stc.connector.appconn.file.
FileTextMessage input, dtd.otdOutputDTD1325973702.DB_Employee
 otdOutputDTD_DB_Employee_1, otdSybase.OtdSybaseOTD otdSybase_1,
 com.stc.connector.appconn.file.FileApplication FileClient_1 )
        throws Throwable
    {
        FileClient_1.setText( "Selecting records from db_employee
 table via Table Select........" );
        FileClient_1.write();
        otdSybase_1.getDb_employee().select( input.getText() );
        while (otdSybase_1.getDb_employee().
next()) {
            otdOutputDTD_DB_Employee_1.setEmpNo( typeConverter.
shortToString( otdSybase_1.getDb_employee().getEMP_NO(), "#",
 false, "" ) );
            otdOutputDTD_DB_Employee_1.setLastname(
 otdSybase_1.getDb_employee().getLAST_NAME() );
            otdOutputDTD_DB_Employee_1.setFirstname(
 otdSybase_1.getDb_employee().getFIRST_NAME() );
            otdOutputDTD_DB_Employee_1.setRate(
 otdSybase_1.getDb_employee().getRATE().toString() );
            otdOutputDTD_DB_Employee_1.setLastDate(
 typeConverter.dateToString( otdSybase_1.getDb_employee().
getLAST_UPDATE(), "yyyy-MM-dd hh:mm:ss", false, "" ) );
            FileClient_1.setText( otdOutputDTD_DB_Employee_1.
marshalToString() );
            FileClient_1.write();
        }
        FileClient_1.setText( "Table Select Done." );
        FileClient_1.write();
    }

}

The Insert Operation

To perform an insert operation on a table:

Execute the insert() method. Assign a field.

Insert the row by calling insertRow()

This example inserts an employee record.

package prjSybase_JCDjcdALL;


public class jcdInsert
{

    public com.stc.codegen.logger.Logger logger;

    public com.stc.codegen.alerter.Alerter alerter;

    public com.stc.codegen.util.CollaborationContext collabContext;

    public com.stc.codegen.util.TypeConverter typeConverter;

    public void receive( com.stc.connector.appconn.file.
FileTextMessage input, otdSybase.OtdSybaseOTD otdSybase_1,
     dtd.otdInputDTD_1206505729.DB_Employee otdInputDTD_DB_Employee_1,
 com.stc.connector.appconn.file.FileApplication FileClient_1 )
        throws Throwable
    {
        FileClient_1.setText( "Inserting records in to
 db_employee table......" );
        FileClient_1.write();
        otdInputDTD_DB_Employee_1.unmarshalFromString(
 input.getText() );
        otdSybase_1.getDb_employee().insert();
        for (int i1 = 0; i1 < otdInputDTD_DB_Employee_1.
countX_sequence_A(); i1 += 1) {
            otdSybase_1.getDb_employee().setEMP_NO(
 typeConverter.stringToShort( otdInputDTD_DB_Employee_1.
getX_sequence_A( i1 ).getEmpNo(), "#", false, 0 ) );
            otdSybase_1.getDb_employee().setLAST_NAME(
 otdInputDTD_DB_Employee_1.getX_sequence_A( i1 ).getLastname() );
            otdSybase_1.getDb_employee().setFIRST_NAME(
 otdInputDTD_DB_Employee_1.getX_sequence_A( i1 ).getFirstname() );
            otdSybase_1.getDb_employee().setRATE(
 new java.math.BigDecimal( otdInputDTD_DB_Employee_1.
getX_sequence_A( i1 ).getRate() ) );
            otdSybase_1.getDb_employee().setLAST_UPDATE(
 typeConverter.stringToTimestamp( otdInputDTD_DB_Employee_1.
getX_sequence_A( i1 ).getLastDate(), "yyyy-MM-dd hh:mm:ss", false, "" ) );
    otdSybase_1.getDb_employee().insertRow();
        }
        FileClient_1.setText( "Insert Done." );
        FileClient_1.write();
    }

}

The Update Operation

To perform an update operation on a table:

Execute the update() method.

Using a while loop together with next(), move to the row that you want to update.

Assign updating value(s) to the fields of the table OTD

Update the row by calling updateRow().

package prjSybase_JCDjcdALL;


public class jcdUpdate
{

    public com.stc.codegen.logger.Logger logger;

    public com.stc.codegen.alerter.Alerter alerter;

    public com.stc.codegen.util.CollaborationContext collabContext;

    public com.stc.codegen.util.TypeConverter typeConverter;

    public void receive( com.stc.connector.appconn.file.
FileTextMessage input, otdSybase.OtdSybaseOTD otdSybase_1,
com.stc.connector.appconn.file.FileApplication FileClient_1 )
        throws Throwable
    {
        FileClient_1.setText( "Updating the Rate and Last_update fields .. " );
        FileClient_1.write();
        otdSybase_1.getDb_employee().update( input.getText() );
        while (otdSybase_1.getDb_employee().next()) {
            otdSybase_1.getDb_employee().setLAST_NAME( "Krishna" );
            otdSybase_1.getDb_employee().setFIRST_NAME( "Kishore" );
            otdSybase_1.getDb_employee().updateRow();
        }
        FileClient_1.setText( "Update Done." );
        FileClient_1.write();
    }

}

The Delete Operation

To perform a delete operation on a table:

Execute the delete() method.

In this example DELETE an employee.

package prjSybase_JCDjcdALL;

public class jcdDelete
{
public com.stc.codegen.logger.Logger logger;
public com.stc.codegen.alerter.Alerter alerter;
public com.stc.codegen.util.CollaborationContext collabContext;

    public com.stc.codegen.util.TypeConverter typeConverter;

    public void receive( com.stc.connector.appconn.file.
FileTextMessage input, otdSybase.OtdSybaseOTD otdSybase_1,
com.stc.connector.appconn.file.FileApplication FileClient_1 )
        throws Throwable
    {
        FileClient_1.setText( "Deleting record............" );
        FileClient_1.write();
        otdSybase_1.getDb_employee().delete( input.getText() );
        FileClient_1.setText( "Delete Done." );
        FileClient_1.write();
    }

}