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# Part II. Client API reference

Table of Contents

Foreword about abstraction
  SQL identifiers
HOWTO for common tasks
  Open a connection
  Define a data source (DSN)
  Execute a SELECT command
  Modify the result of a SELECT command
  Execute an INSERT, UPDATE or DELETE command
  Get the last inserted row
  Execute a DDL command
  Get information about a table's columns
  Update the meta data about a table
  Validate a DML statement
  Control value's assignment to various objects
  Add your own data to a GdaMetaStore
Object Hierarchy
Initialization and configuration
  Libgda initialization — Library initialization
  Configuration — Access/Management of libgda configuration
  Configuring Libgda with environment variables
Connections & commands
  Convenience functions — Do quickly some actions
  GdaConnection — Management of connections to data sources
  GdaSqlParser — SQL parser
  GdaStatement — Single SQL statement
  GdaBatch — Multiple SQL statements grouped together.
  GdaHolder — Container for a single GValue
  GdaSet — Container for several values
  GdaConnectionEvent — Any event which has occurred on a GdaConnection
  GdaTransactionStatus — Keeps track of the transactional status of a connection
  GdaXaTransaction — Distributed transaction manager
  Description of the data model returned by gda_connection_get_meta_store_data()
    GDA_CONNECTION_META_NAMESPACES
    GDA_CONNECTION_META_TYPES
    GDA_CONNECTION_META_TABLES
    GDA_CONNECTION_META_VIEWS
    GDA_CONNECTION_META_FIELDS
Virtual connections
  GdaVirtualProvider — Base class for all virtual providers
  GdaVproviderDataModel — Virtual provider for connections based on a list of GdaDataModel
  GdaVproviderHub — Virtual provider for connections based on other connection
  GdaVirtualConnection — Base class for all virtual connection objects
  GdaVconnectionDataModel — Virtual connection based on a list of GdaDataModel
  GdaVconnectionHub — Virtual connection which bind together connections
Data handling
  A single Value — Assorted functions for dealing with GValue values.
  Custom data validation
    GdaHolder controls
    GdaSet controls
    GdaDataProxy controls
  Advanced GdaDataSelect usage
    Automatic re-run of the SELECT statement
    Invalid parameters
  Blobs — Binary data and BLOBs handling
  GdaDataModel — Basic data model class
  GdaDataSelect — Data models returned by the execution of a SELECT statement
  GdaDataModel columns — Management of GdaDataModel column attributes
  GdaDataModelIter — Data model iterator
  GdaDataModelImport — Importing data from a string or a file
  GdaDataAccessWrapper — Offers a random access on top of a cursor-only access data model
  GdaDataModelArray — An implementation of GdaDataModel based on a GArray.
  GdaDataModelArray's rows — Row for a GdaDataModelArray object
  GdaDataModelBdb — GdaDataModel to access Berkeley DB database contents
  GdaDataModelDir — GdaDataModel to list files in filesystem
  GdaDataProxy — Proxy to hold modifications for any GdaDataModel, and provides the GdaDataModel interface itself
  GdaDataComparator — Simple data model's contents comparison
Data conversions
  GdaDataHandler — Interface which provides data handling (conversions) capabilities
  GdaHandlerString — Default handler for strings
  GdaHandlerBoolean — Default handler for booleans
  GdaHandlerTime — Default handler for time, date and timestamp
  GdaHandlerNumerical — Default handler for numeric values
  GdaHandlerBin — Default handler for binary values
  GdaHandlerType — Default handler for GType values
Dictionary - metadata
  Setup
  Adding custom data
  Database structure
    Data types
    SQL identifiers
    Short and full names
    Individual table description
  GdaMetaStore — Dictionary object
  GdaMetaStruct — In memory representation of some database objects
Data definition (DDL) queries
  GdaServerOperation — Handles any DDL query in an abstract way
  GdaServerOperation: individual nodes — Getting information about parts (nodes) composing a path
  GdaServerOperation: sequences — Manipulating sequences
Miscellaneous
  Utility functions
  Logging — Log functions
  GdaMutex — Recursive mutex implementation
  GdaLockable — Interface for locking objects in a multi threaded environment
  Attributes manager — Manager for lists of attributes

The following sections describe the API available for GDA applications.

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