Statements

Apache OpenOffice Developer's Guide

Database Access

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• Architecture
• Example: Querying the Bibliography Database

• Data Sources in Apache OpenOffice API

• DataSources

• The DataSource Service
• Queries

• Adding and Editing Predefined Queries
• Runtime Settings For Predefined Queries
• The SingleSelectQueryComposer
• The SQLQueryComposer

• Forms and Reports
• Document Links
• Tables and Columns

• Connections

• Connecting Through a DataSource
• Connecting Using the DriverManager and a Database URL
• Connecting Through a Specific Driver
• Driver Specifics

• The SDBC Driver for JDBC
• The SDBC Driver for ODBC
• The SDBC Driver for Adabas D
• The SDBC Driver for ADO
• The SDBC Driver for dBase
• The SDBC Driver for Flat File Formats
• The SDBC Driver for Apache OpenOffice Calc Files
• The SDBC Driver for address books
• The SDBC Driver for embedded HSQL databases

• Connection Pooling
• Piggyback Connections

• Manipulating the Data

• The RowSet Service

• Usage
• Events and Other Notifications
• Clones of the RowSet Service

• Statements

• Creating Statements
• Inserting and Updating Data
• Getting Data from a Table

• Result Sets

• Retrieving Values from Result Sets
• Moving the Result Set Cursor
• Using the getXXX Methods
• Scrollable Result Sets
• Modifiable Result Sets
• Update
• Insert
• Delete
• Seeing Changes in Result Sets

• ResultSetMetaData
• Using Prepared Statements
• PreparedStatement From DataSource Queries

• Database Design

• Using DDL to Change the Database Design
• Using SDBCX to Access the Database Design

• Catalog Service
• Table Service
• Column Service
• Index Service
• Key Service
• View Service
• Group Service
• User Service
• The Descriptor Pattern
• Adding an Index
• Creating a User
• Adding a Group

• Using DBMS Features

• Stored Procedures

• Writing Database Drivers

• SDBC Driver
• Driver Service
• Connection Service
• XDatabaseMetaData Interface
• Statements
• Support Scalar Functions

• Open Group CLI Numeric Functions
• Open Group CLI String Functions
• Open Group CLI Time and Date Functions
• Open Group CLI System Functions
• Open Group CLI Conversion Functions

• Handling Unsupported Functionality
• Extending Database Drivers

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Statements are used to create ResultSets or to update the database. The executeQuery() method creates new ResultSets. The following code snippet shows how the new ResultSet is created. There can be only one ResultSet at a time.

  Reference< XResultSet > SAL_CALL OStatement_Base::executeQuery( const ::rtl::OUString& sql ) 
          throw(SQLException, RuntimeException)
  {
      ::osl::MutexGuard aGuard( m_aMutex );
      checkDisposed(OStatement_BASE::rBHelper.bDisposed);
 
      Reference< XResultSet > xRS = NULL;
      // create a resultset as result of executing the sql statement
      // something needs to be done here :-)
      m_xResultSet = xRS; // we nedd a reference to it for later use
      return xRS;
  }

The executeUpdate() methods only return the rows that were affected by the given SQL statement. The last method execute returns true when a ResultSet object is returned when calling the method getResultSet(), otherwise it returns false. All other methods have to be implemented.

PreparedStatement

The PreparedStatement is used when an SQL statement should be executed more than once. In addition to the statement class, it must support the ability to provide information about the parameters when they exist. For this reason, this class must support the com.sun.star.sdbc.XResultSetMetaDataSupplier interface and also the com.sun.star.sdbc.XParameters interface to set values for their parameters.

Result Set

The ResultSet needs to be implemented. For the first step, only forward ResultSets could be implemented, but it is recommended to support all ResultSet methods.

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