/*
   Copyright (c) 2003, 2021, Oracle and/or its affiliates.
    All rights reserved. Use is subject to license terms.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

/**
 * @mainpage DBA User Guide
 *
 * @section secIntro Introduction
 * DBA is an API to access the NDB Cluster.
 * 
 * DBA supports transactions using an asynchronous execution model.
 * Everything but transactions is synchronous.
 *
 * DBA uses the concept of bindings to simplify database access.
 * A <em>binding</em> is a relation between a database table and 
 * one or several C structs.
 * A binding is created initially and then used multiple time during
 * application execution.
 *
 * Each of the data accessing functions in DBA is implemented as a
 * transaction, i.e. the call will either fully complete or 
 * nothing happens (the transaction fails).
 *
 * DBA also supports "read as much as possible" with bulk read.
 * With bulk read the application can specify a set of primary keys and 
 * try to read all of the corresponding rows. The bulk read will not fail 
 * if a row does not exist but will instead inform the application using a 
 * RowFoundIndicator variable.
 *
 * A <em>request</em> is a transaction or a bulk read.
 *
 * @section secError Error Handling
 * When a synchronous method in DBA fails these methods are applicable:
 * -# DBA_GetLatestError()
 * -# DBA_GetLatestNdbError()
 * -# DBA_GetLatestErrorMsg()
 *
 * The DBA_GetLatestErrorMsg() will then return a description of 
 * what has failed.
 *
 * For asynchronous methods the application should:
 * -# check that the RequestId returned by function is not 
 *    @ref DBA_INVALID_REQID
 * -# check Status supplied in callback (see @ref DBA_AsyncCallbackFn_t)
 * 
 * If @ref DBA_INVALID_REQID is returned, 
 * the details of error can be found using
 * "latest"-functions.
 *
 * If error is indicated in callback (using Status), when the 
 * "latest"-functions are <b>NOT</b> applicable.
 *
 * @section secExamples Example Programs
 *
 * - @ref common.hpp
 * - @ref basic.cpp
 * - @ref br_test.cpp
 * - @ref ptr_binding_test.cpp
 *
 */

/**
 * @page basic.cpp basic.cpp
 * @include basic.cpp 
 */

/**
 * @page common.hpp common.hpp
 * @include common.hpp
 */

/**
 * @page br_test.cpp br_test.cpp
 * @include br_test.cpp 
 */

/**
 * @page ptr_binding_test.cpp ptr_binding_test.cpp 
 * @include ptr_binding_test.cpp 
 */

/** @addtogroup DBA
 *  @{
 */

/****** THIS LINE IS 80 CHARACTERS WIDE - DO *NOT* EXCEED 80 CHARACTERS! ****/

#ifndef DBA_H
#define DBA_H

/* --- Include files ---- */

#include <ndb_global.h>
#include <defs/pcn_types.h>

/* --- Types and definitions --- */

/**
 * Possible error status for DBA functions.
 */
typedef enum {
  DBA_NO_ERROR = 0,         /**< Success */
    
  DBA_NOT_IMPLEMENTED = -1, /**< Function not implemented */
  DBA_NDB_ERROR = -2,       /**< Uncategorised error from NDB */
  DBA_ERROR = -3,           /**< Uncategorised error from DBA implementation */
  
  DBA_APPLICATION_ERROR = 1,    /**< Function called with invalid argument(s)
				   or other application errors */
  DBA_NO_DATA = 2,              /**< No row with specified PK existed */
  DBA_CONSTRAINT_VIOLATION = 3, /**< There already exists a row with that PK*/ 
  
  DBA_SCHEMA_ERROR = 4,        /**< Table already exists */
  DBA_INSUFFICIENT_SPACE = 5,  /**< The DB is full */
  DBA_TEMPORARY_ERROR = 6,     /**< Some temporary problem occured */
  DBA_TIMEOUT = 7,             /**< The request timed out, probably due to 
				  dead-lock */
  DBA_OVERLOAD = 8,            /**< The DB is overloaded */
  DBA_UNKNOWN_RESULT = 9       /**< It is unknown wheater transaction was
				  commited or aborted */
} DBA_Error_t;

/**
 * Error code. This is the error code that is returned by NDB.
 * Not to be confused by the status returned by the DBA implementation.
 */
typedef int DBA_ErrorCode_t;

/**
 * DBA column types
 */
typedef enum {
  DBA_CHAR,                      /**< String */
  DBA_INT                        /**< Integer */
} DBA_DataTypes_t;


/**
 * Column description.
 * Used for creating tables.
 */
typedef struct DBA_ColumnDesc {
  
    const char*      Name;       /**< Name of table column */
    DBA_DataTypes_t  DataType;   /**< Datatype of table column*/
    Size_t           Size;       /**< Column size in bytes */
    Boolean_t        IsKey;      /**< True if column is part of primary key */

} DBA_ColumnDesc_t;

/**
 * Used to simplify binding definitions. See @ref DBA_ColumnBinding
 * for example.
 * 
 * @param ColName Name of column in db table
 * @param Type Column/field type.
 * @param Struct Structure
 * @param Field Field in structure
 * @return Arg list for defining binding of type @ref DBA_Binding_t
 */
#define DBA_BINDING( ColName, Type, Struct, Field ) \
   { ColName, Type, PCN_SIZE_OF( Struct, Field ), \
     PCN_OFFSET_OF( Struct, Field ), 0, 0 }

/**
 * Used to simplify ptr binding definitions. See @ref DBA_ColumnBinding
 * for example.
 * 
 * @param Struct Structure
 * @param Field Field in structure
 * @return Arg list for defining binding of type @ref DBA_Binding_t
 */
#define DBA_BINDING_PTR(Struct, Field, ColBindings, NbCBindings) \
   { 0, DBA_CHAR, NbCBindings, PCN_OFFSET_OF( Struct, Field ), \
     1, ColBindings }

/**
 * The @ref DBA_ColumnBinding_t is used to describe a binding between one
 * column and one field of a C struct.
 *
 *<pre>
 * typedef struct Address {
 *   char StreetName[30];
 *   int  StreetNumber;
 * } Address_t;
 *
 * typdef struct Person {
 *   char        Name[30];
 *   Address_t * AddressPtr;
 * } Person_t; </pre>
 *
 *
 * For example, if the field Name of a Person_t data structure is
 * bound to the column "NAME", the corresponding binding would be
 * defined as:
 *
 *<pre>
 * DBA_ColumnBinding_t NameBinding =
 *   DBA_BINDING( "name", DBA_CHAR, Person_t, Name ); </pre>
 *
 *
 * There is also the @ref DBA_BINDING_PTR which is used when 
 * several linked structures should be put into one table.
 *
 * For example, if data in a Person_t data structure should be saved
 * in the same table as the Address_t data structure 
 * (as the address belongs to the person), the corresponding binding would be
 * defined as:
 *
 *<pre>
 * DBA_ColumnBinding_t AddrBinding[AddrLen]; This binding describes how the 
 *                                            fields in the Address_t 
 *                                            structure is linked to the 
 *                                            table PERSON_ADDRESS
 *
 * DBA_ColumnBinding_t AddressBinding = 
 *   DBA_BINDING_PTR(Person_t, AddressPtr, AddrBinding, AddrLen); </pre>
 *
 *
 */
struct DBA_ColumnBinding {
  const char*                Name;      /**< Name of table column */
  DBA_DataTypes_t            DataType;  /**< Type of member in structure */
  Size_t                     Size;      /**< Size in bytes of member
					   or no of @ref DBA_ColumnBinding's 
					   when doing ptr binding */
  Size_t                     Offset;    /**< Offset of the member */
  
  Boolean_t                  Ptr;       /**< True if binding is of ptr type */
  const struct DBA_ColumnBinding * SubBinding;  /**< Address of Binding Ptr 
						   valid if Ptr is true */
};

/**
 * Typedef: @ref DBA_ColumnBinding
 */
typedef struct DBA_ColumnBinding DBA_ColumnBinding_t;

/**
 * A @ref DBA_Binding_t object is used to establish a binding between 
 * one or more columns of a table to the fields of C structs.
 *
 * It is used with insert, and update and read transactions to define
 * on which columns of the table the operations is performed, and to
 * which members of a C data structure they map.
 *
 * All key columns must be bound to a field of the struct.
 *
 * The function @ref DBA_CreateBinding is used to create this binding.
 */
typedef struct DBA_Binding DBA_Binding_t;

/* --- Exported functions --- */

/**
 * Set DBA configuration parameter
 *<pre>
 * Id Description                 Default Min  Max
 * == =========================== ======= ==== ====
 * 0  NBP Interval                   10    4   -
 * 1  Operations/Bulkread          1000    1   5000
 * 2  Start transaction timeout       0    0   -
 * 3  Force send algorithm            1    0   2
 *</pre>
 * @return Status
 */
DBA_Error_t DBA_SetParameter(int ParameterId, int Value);

/**
 * Set DBA configuration parameter.
 * See @ref DBA_SetParameter for description of parameters.
 *
 * @return Status
 */
DBA_Error_t DBA_GetParameter(int ParameterId, int * Value);

/**
 * Initialize DBA library and connect to NDB Cluster.
 *
 * @return Status
 */
DBA_Error_t DBA_Open( ); 

/**
 * Close connection to NDB cluster and free allocated memory.
 * 
 * @return Error status
 */
DBA_Error_t DBA_Close(void); 

/**
 * Get latest DBA error.
 *
 * @note Only applicable to synchronous methods
 */
DBA_Error_t DBA_GetLatestError();

/**
 * Get latest NDB error.
 *
 * @note Only applicable to synchronous methods
 */
DBA_ErrorCode_t DBA_GetLatestNdbError();

/**
 * Get latest error string associated with DBA_GetLatestError().
 *
 * @note String must not be free by caller of this method.
 * @note Only applicable to synchronous methods.
 */
const char * DBA_GetLatestErrorMsg();

/**
 * Get error msg associated with code
 *
 * @note String must not be free by caller of this method
 */
const char * DBA_GetErrorMsg(DBA_Error_t);

/**
 * Get error msg associated with code
 *
 * @note String must not be free by caller of this method
 */
const char * DBA_GetNdbErrorMsg(DBA_ErrorCode_t);

/**
 * Create a table.
 * 
 * @param TableName Name of table to create.
 * @param NbColumns numbers of columns.
 * @param Columns Column descriptions.
 * @return Status.
 */
DBA_Error_t 
DBA_CreateTable( const char* TableName, int NbColumns, 
		 const DBA_ColumnDesc_t Columns[] );

/**
 * Destroy a table.
 * 
 * @param TableName Table name.
 * @return Status.
 * @note Not implemented
 */
DBA_Error_t 
DBA_DropTable( const char* TableName );


/**
 * Test for existence of a table.
 * 
 * @param TableName Table name.
 * @return Boolean value indicating if table exists or not.
 */
Boolean_t 
DBA_TableExists( const char* TableName );

/**
 * Define a binding between the columns of a table and a C structure.
 * 
 * @param TableName table
 * @param NbCol number of columns bindings
 * @param ColBinding bindings
 * @param StructSz Sizeof structure.
 * @return Created binding, or NULL if binding could not be created.
 */
DBA_Binding_t*
DBA_CreateBinding( const char* TableName, 
		    int NbCol, const DBA_ColumnBinding_t ColsBinding[], 
		    Size_t StructSz );

/**
 * Destroys a @ref DBA_Binding_t allocated with @ref
 * DBA_CreateBinding.  
 *
 * @param pBinding Pointer to binding.
 * @return Status.
 */
DBA_Error_t 
DBA_DestroyBinding( DBA_Binding_t* Binding );

/**
 * Used to identify a pending db request
 */
typedef long DBA_ReqId_t;

/**
 * An asynchronous call returning this means that the function was called
 * with invalid arguments. The application should check error status
 * with DBA_GetLatestError() etc.
 */
#define DBA_INVALID_REQID 0

/**
 * Callback function for transactions. 
 * Will be called in NBP process (Newton Batch Process).
 *
 * @note The implementation of the callback function is not allowed to
 * make an asynchronous database call.
 *
 * @param ReqId Request identifier
 * @param Status Status of the request 
 * @param ErrorCode Error code given by NDB
 * @see DBA_Error_t
 */
typedef void (*DBA_AsyncCallbackFn_t)( DBA_ReqId_t ReqId,
				       DBA_Error_t Status,
				       DBA_ErrorCode_t ErrorCode );
/**
 * Insert row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of pointers to structures. 
 * @param NbRows No of rows to insert (i.e. length of pData array)
 * @return Request identifier
 *
 * @note All the table columns must be part of the binding.
 */
DBA_ReqId_t
DBA_InsertRows( const DBA_Binding_t* pBinding, const void * const pData[],
		int NbRows,
		DBA_AsyncCallbackFn_t CbFunc );

/**
 * Insert row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of structures. 
 * @param NbRows No of rows to insert (i.e. length of pData array)
 * @return Request identifier
 *
 * @note All the table columns must be part of the binding.
 */
DBA_ReqId_t
DBA_ArrayInsertRows( const DBA_Binding_t* pBinding, const void * pData,
		     int NbRows,
		     DBA_AsyncCallbackFn_t CbFunc );

/**
 * Update row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of pointers to structures. Fields that are part of the 
 *              key are used to generate the where clause, the
 *              other fields are used to update the row.
 * @param NbRows No of rows to update (i.e. length of pData array).
 * @return Request identifier
 */
DBA_ReqId_t
DBA_UpdateRows( const DBA_Binding_t* pBinding, const void * const pData[],
		int NbRows,
		DBA_AsyncCallbackFn_t CbFunc );

/**
 * Update row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of structures. Fields that are part of the 
 *              key are used to generate the where clause, the
 *              other fields are used to update the row.
 * @param NbRows No of rows to update (i.e. length of pData array).
 * @return Request identifier
 */
DBA_ReqId_t
DBA_ArrayUpdateRows( const DBA_Binding_t* pBinding, const void * pData,
		     int NbRows,
		     DBA_AsyncCallbackFn_t CbFunc );

/**
 * Delete row(s) from the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of pointers to structures. 
 *              Only fields part of the primary key needs to be set.
 * @param NbRows No of rows to delete (i.e. length of pData array)
 * @return Request identifier
 */
DBA_ReqId_t
DBA_DeleteRows( const DBA_Binding_t* pBinding, const void * const pData[],
		int NbRows,
		DBA_AsyncCallbackFn_t CbFunc );


/**
 * Delete row(s) from the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of structures. Only fields part of the primary
 *              key needs to be set.
 * @param NbRows No of rows to delete (i.e. length of pData array)
 * @return Request identifier
 */
DBA_ReqId_t
DBA_ArrayDeleteRows( const DBA_Binding_t* pBinding, const void * pData,
		     int NbRows,
		     DBA_AsyncCallbackFn_t CbFunc );

/**
 * Updates/Inserts row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of pointers to structures.
 * @param NbRows No of rows to update/insert (i.e. length of pData array)
 * @return Request identifier
 * @note All the table columns must be part of the binding.
 */
DBA_ReqId_t
DBA_WriteRows( const DBA_Binding_t* pBinding, const void * const pData[],
	       int NbRows,
	       DBA_AsyncCallbackFn_t CbFunc );

/**
 * Update/Insert row(s) in the table (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of structures. 
 * @param NbRows No of rows to update/insert (i.e. length of pData array)
 * @return Request identifier
 * @note All the table columns must be part of the binding.
 */
DBA_ReqId_t
DBA_ArrayWriteRows( const DBA_Binding_t* pBinding, const void * pData,
		    int NbRows,
		    DBA_AsyncCallbackFn_t CbFunc );

/**
 * Read row(s) from a table of the database (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of pointers to structures. 
 *              Only fields part of the primary key needs to be set.
 *              The other fields in the binding will be populated.
 * @param NbRows No of rows to read (i.e. length of pData array)
 * @return Request identifier
 */
DBA_ReqId_t
DBA_ReadRows( const DBA_Binding_t* pBinding, void * const pData[],
	      int NbRows,
	      DBA_AsyncCallbackFn_t CbFunc );

/**
 * Read row(s) from a table of the database (one transaction)
 * 
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of structures. 
 *              Only fields part of the primary key needs to be set.
 *              The other fields in the binding will be populated.
 * @param NbRows No of rows to read (i.e. length of pData array)
 * @return Request identifier
 */
DBA_ReqId_t
DBA_ArrayReadRows( const DBA_Binding_t* pBinding, void * pData,
		   int NbRows,
		   DBA_AsyncCallbackFn_t CbFunc );

/****** THIS LINE IS 80 CHARACTERS WIDE - DO *NOT* EXCEED 80 CHARACTERS! ****/

/**
 * Insert <b>one</b> row for each specified binding (as one transaction).
 * 
 * @param pBindings Array of pointers to bindings.
 * @param pData Array of pointers to structures. 
 * @param NbBindings No of bindings (tables) to insert into,
 *        i.e. length of arrays pBindings and pData
 * @return Request identifier
 * @note It is valid to specify the same binding twice 
 *       (with corresponding data pointer) if you want to insert two
 *       rows in one table 
 */
DBA_ReqId_t
DBA_MultiInsertRow(const DBA_Binding_t * const pBindings[],
		   const void * const pData[],
		   int NbBindings,
		   DBA_AsyncCallbackFn_t CbFunc );

/**
 * Update <b>one</b> row for each specified binding (as one transaction).
 * 
 * @param pBindings Array of pointers to bindings.
 * @param pData Array of pointers to structures. 
 * @param NbBindings No of bindings (tables) to insert into
 *        i.e. length of arrays pBindings and pData
 * @return Request identifier
 * @note It is valid to specify the same binding twice 
 *       (with corresponding data pointer) if you want to update two
 *       rows in one table 
 */
DBA_ReqId_t
DBA_MultiUpdateRow(const DBA_Binding_t * const pBindings[],
		   const void * const pData[],
		   int NbBindings,
		   DBA_AsyncCallbackFn_t CbFunc );

/**
 * Update/insert <b>one</b> row for each specified binding (as one transaction).
 * 
 * @param pBindings Array of pointers to bindings.
 * @param pData Array of pointers to structures. 
 * @param NbBindings No of bindings (tables) to insert into
 *        i.e. length of arrays pBindings and pData
 * @return Request identifier
 * @note It is valid to specify the same binding twice 
 *       (with corresponding data pointer) if you want to update/insert two
 *       rows in one table 
 */
DBA_ReqId_t
DBA_MultiWriteRow(const DBA_Binding_t * const pBindings[],
		  const void * const pData[],
		  int NbBindings,
		  DBA_AsyncCallbackFn_t CbFunc );

/**
 * Delete <b>one</b> row for each specified binding (as one transaction).
 * 
 * @param pBindings Array of pointers to bindings.
 * @param pData Array of pointers to structures. 
 * @param NbBindings No of bindings (tables) to insert into
 *        i.e. length of arrays pBindings and pData
 * @return Request identifier
 * @note It is valid to specify the same binding twice 
 *       (with corresponding data pointer) if you want to delete two
 *       rows in one table 
 */
DBA_ReqId_t
DBA_MultiDeleteRow(const DBA_Binding_t * const pBindings[],
		   const void * const pData[],
		   int NbBindings,
		   DBA_AsyncCallbackFn_t CbFunc );

/**
 * Read <b>one</b> row for each specified binding (as one transaction).
 * 
 * @param pBindings Array of pointers to bindings.
 * @param pData Array of pointers to structures. 
 * @param NbBindings No of bindings (tables) to insert into
 *        i.e. length of arrays pBindings and pData
 * @return Request identifier
 * @note It is valid to specify the same binding twice 
 *       (with corresponding data pointer) if you want to read two
 *       rows in one table 
 */
DBA_ReqId_t
DBA_MultiReadRow(const DBA_Binding_t * const pBindings[],
		 void * const pData[],
		 int NbBindings,
		 DBA_AsyncCallbackFn_t CbFunc );

/****** THIS LINE IS 80 CHARACTERS WIDE - DO *NOT* EXCEED 80 CHARACTERS! ****/

/**
 * A structure used for bulk reads.
 * The structure contains a pointer to the data and an indicator.
 * After the bulk read has completed, the indicator is set to 1 if the row
 * was found and to 0 if the row was not found.
 *
 */
typedef struct DBA_BulkReadResultSet {
  void * DataPtr;               /**< Pointer to data. Only fields part of 
				   primary key members needs
				   to be set before bulk read. */
  Boolean_t RowFoundIndicator;  /**< This indicator has a valid value
				   only after bulk read has completed.
				   If the value is 1 then the row was found */
} DBA_BulkReadResultSet_t;

/**
 * Read rows from a table of the database (potentially multiple transactions)
 * The users should for each NbRows specify the fields part of the primary key
 *
 * @param pBinding Binding between table columns and struct fields.
 * @param pData Array of DBA_BulkReadResultSet_t, with DataPtr pointing to 
 *              structure. Only the fields which are part of the 
 *              primary key need be set.
 *              The RowFoundIndicator will be set when the request returns.
 * @param NbRows No of rows to read (i.e. length of pData array)
 * @return Request identifier
 *
 */
DBA_ReqId_t
DBA_BulkReadRows(const DBA_Binding_t * pBinding,
		 DBA_BulkReadResultSet_t pData[],
		 int NbRows,
		 DBA_AsyncCallbackFn_t CbFunc );

/**
 * Read rows from several tables of the database in potentially multiple 
 * transactions.
 *
 *<pre>
 * The pData array <b>must</b> be organized as follows:
 *   NbRows with DataPtr pointing to structure of type pBindings[0]
 *   NbRows with DataPtr pointing to structure of type pBindings[1]
 *   ... </pre>
 * Meaning that the pData array must be (NbBindings * NbRows) in length.
 *
 * The user should for each (NbRows * NbBindings) specify the primary key 
 * fields.
 *
 * @param pBindings Array of pointers to bindings 
 * @param pData Array of DBA_BulkReadResultSet_t. 
 *              With DataPtr pointing to structure. Only the fields which 
 *              are part of the key need be set.
 *              The RowFoundIndicator will be set when the operations returns.
 * @param NbBindings No of bindings (i.e. length of pBindings array)
 * @param NbRows No of rows per binding to read
 * @return Request identifier
 */
DBA_ReqId_t
DBA_BulkMultiReadRows(const DBA_Binding_t * const pBindings[],
		      DBA_BulkReadResultSet_t pData[],
		      int NbBindings,
		      int NbRows,
		      DBA_AsyncCallbackFn_t CbFunc );

/** @} */

#endif
