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# Part II. API reference

Table of Contents

HOWTO for common tasks
  Open a connection
  Define a data source (DSN)
  Build statements without using a parser
    INSERT INTO customers (e, f, g) VALUES (##p1::string, 15, 'joe')
    SELECT people.firstname AS person, people.lastname, "date" AS birthdate, age FROM people
    SELECT c."date", name AS person FROM "select" AS c INNER JOIN orders USING (id)
    UPDATE products set ref='A0E''FESP' WHERE id = 14
    DELETE FROM items WHERE id = ##theid::int
    SELECT myfunc (a, 5, 'Joe') FROM mytable
    SELECT name FROM master WHERE id IN (SELECT id FROM subdata)
    INSERT INTO customers (e, f, g) SELECT id, name, location FROM subdate
    SELECT id, name FROM subdata1 UNION SELECT ident, lastname FROM subdata2
    SELECT CASE tag WHEN 'Alpha' THEN 1 WHEN 'Bravo' THEN 2 WHEN 'Charlie' THEN 3 ELSE 0 END FROM data
    SELECT product_id, name, sum (4 * 5 * price * 1.200000) FROM invoice_lines
  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
  Library initialization — Library initialization and information
  Configuration — Access/Management of libgda configuration
  Configuring Libgda with environment variables
Connections & commands
  GdaConnection — A connection to a database
  GdaSqlParser — SQL parser
  GdaSqlBuilder — Factory object for statements
  GdaStatement — Single SQL statement
  GdaRepetitiveStatement — Execute the same statement several times with different values
  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 transaction 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
    GDA_CONNECTION_META_INDEXES
Virtual connections
  GdaVirtualProvider — Base class for all virtual provider objects
  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
  GdaLdapConnection — LDAP connection objects
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 — Data model interface
  GdaDataSelect — Base class for 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
  GdaDataPivot — A data model for data summarisation
  GdaDataAccessWrapper — Offers a random access on top of a cursor-only access data model
  GdaDataModelArray — An implementation of GdaDataModel based on a GArray
  GdaRow — Individual row of a GdaDataModelArray object
  GdaDataModelLdap — GdaDataModel to extract LDAP information
  GdaDataModelBdb — GdaDataModel to access Berkeley DB database contents
  GdaDataModelDir — GdaDataModel to list files in filesystem
  GdaDataProxy — Proxy to hold modifications for any GdaDataModel, providing the GdaDataModel interface itself
  GdaDataComparator — Simple data model's contents comparison
Trees
  GdaTree — A tree-structure
  GdaTreeManager — Base class for all the tree managers
  GdaTreeNode — A node in a GdaTree
  GdaTreeMgrLabel — A tree manager which creates a single node
  GdaTreeMgrSelect — A tree manager which creates a node for each row resulting from the execution of a SELECT statement
  GdaTreeMgrSchemas — A tree manager which creates a node for each schema in a database
  GdaTreeMgrTables — A tree manager which creates a node for each table in a schema
  GdaTreeMgrColumns — A tree manager which creates a node for each column of a table
  GdaTreeMgrLdap — A tree manager which creates a node for each child entry of an LDAP entry
Data conversions
  GdaDataHandler — Interface which provides data handling (conversions) capabilities
  GdaHanderString — Default handler for string values
  GdaHanderBoolean — Default handler for boolean values
  GdaHanderTime — Default handler for time values
  GdaHanderNumerical — Default handler for numeric values
  GdaHanderBin — Default handler for binary values
  GdaHanderType — Default handler for GType values
Dictionary - metadata
  Setup
  Adding custom data
  Database structure
    Data types
    SQL identifiers
    Short and full names
    Declared foreign keys
    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
User interface API reference
  Library initialization — Library initialization and information
  GdauiLogin
  GdauiProviderSelector
  GdauiDataSelector
  GdauiDataProxy
  GdauiBasicForm
  GdauiForm
  GdauiRawForm
  GdauiGrid
  GdauiRawGrid
  GdauiCombo
  GdauiCloud
  GdauiRtEditor
  UI plugins
  GdauiDataEntry
  GdauiDataStore
  GdauiDataFilter
  GdauiDataProxyInfo
  GdauiServerOperation
  GdauiTreeStore
  UI Utility functions
Multi threading
  GdaMutex — Recursive mutex implementation
  GdaLockable — Interface for locking objects in a multi threaded environment
  GdaThreadWrapper — Execute functions in a sub thread
Miscellaneous
  Utility functions — Utility functions
  Logging — Log functions
  Attributes manager — Manager for lists of attributes

The following sections describe the API available for GDA applications.

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