/* File:			statement.h
 *
 * Description:		See "statement.c"
 *
 * Comments:		See "notice.txt" for copyright and license information.
 *
 */

#ifndef __STATEMENT_H__
#define __STATEMENT_H__

#include "psqlodbc.h"

#include "bind.h"


#ifndef FALSE
#define FALSE	(BOOL)0
#endif
#ifndef TRUE
#define TRUE	(BOOL)1
#endif

typedef enum
{
	STMT_ALLOCATED,				/* The statement handle is allocated, but
								 * not used so far */
	STMT_READY,					/* the statement is waiting to be executed */
	STMT_PREMATURE,				/* ODBC states that it is legal to call
								 * e.g. SQLDescribeCol before a call to
								 * SQLExecute, but after SQLPrepare. To
								 * get all the necessary information in
								 * such a case, we simply execute the
								 * query _before_ the actual call to
								 * SQLExecute, so that statement is
								 * considered to be "premature". */
	STMT_FINISHED,				/* statement execution has finished */
	STMT_EXECUTING				/* statement execution is still going on */
} STMT_Status;

#define STMT_ROW_VERSION_CHANGED					(-4)
#define STMT_POS_BEFORE_RECORDSET					(-3)
#define STMT_TRUNCATED							(-2)
#define STMT_INFO_ONLY							(-1)	/* not an error message,
														 * just a notification
														 * to be returned by
														 * SQLError */
#define STMT_OK									0		/* will be interpreted
														 * as "no error pending" */
#define STMT_EXEC_ERROR							1
#define STMT_STATUS_ERROR						2
#define STMT_SEQUENCE_ERROR						3
#define STMT_NO_MEMORY_ERROR					4
#define STMT_COLNUM_ERROR						5
#define STMT_NO_STMTSTRING						6
#define STMT_ERROR_TAKEN_FROM_BACKEND			7
#define STMT_INTERNAL_ERROR						8
#define STMT_STILL_EXECUTING					9
#define STMT_NOT_IMPLEMENTED_ERROR				10
#define STMT_BAD_PARAMETER_NUMBER_ERROR			11
#define STMT_OPTION_OUT_OF_RANGE_ERROR			12
#define STMT_INVALID_COLUMN_NUMBER_ERROR		13
#define STMT_RESTRICTED_DATA_TYPE_ERROR			14
#define STMT_INVALID_CURSOR_STATE_ERROR			15
#define STMT_OPTION_VALUE_CHANGED				16
#define STMT_CREATE_TABLE_ERROR					17
#define STMT_NO_CURSOR_NAME						18
#define STMT_INVALID_CURSOR_NAME				19
#define STMT_INVALID_ARGUMENT_NO				20
#define STMT_ROW_OUT_OF_RANGE					21
#define STMT_OPERATION_CANCELLED				22
#define STMT_INVALID_CURSOR_POSITION			23
#define STMT_VALUE_OUT_OF_RANGE					24
#define STMT_OPERATION_INVALID					25
#define STMT_PROGRAM_TYPE_OUT_OF_RANGE			26
#define STMT_BAD_ERROR							27
#define STMT_INVALID_OPTION_IDENTIFIER					28

/* statement types */
enum
{
	STMT_TYPE_UNKNOWN = -2,
	STMT_TYPE_OTHER = -1,
	STMT_TYPE_SELECT = 0,
	STMT_TYPE_INSERT,
	STMT_TYPE_UPDATE,
	STMT_TYPE_DELETE,
	STMT_TYPE_CREATE,
	STMT_TYPE_ALTER,
	STMT_TYPE_DROP,
	STMT_TYPE_GRANT,
	STMT_TYPE_REVOKE,
	STMT_TYPE_PROCCALL
};

#define STMT_UPDATE(stmt)	(stmt->statement_type > STMT_TYPE_SELECT)


/*	Parsing status */
enum
{
	STMT_PARSE_NONE = 0,
	STMT_PARSE_COMPLETE,
	STMT_PARSE_INCOMPLETE,
	STMT_PARSE_FATAL,
};

/*	Result style */
enum
{
	STMT_FETCH_NONE = 0,
	STMT_FETCH_NORMAL,
	STMT_FETCH_EXTENDED,
};

typedef struct
{
	COL_INFO   *col_info;		/* cached SQLColumns info for this table */
	char		name[MAX_TABLE_LEN + 1];
	char		alias[MAX_TABLE_LEN + 1];
} TABLE_INFO;

typedef struct
{
	TABLE_INFO *ti;				/* resolve to explicit table names */
	int			precision;
	int			scale;
	int			display_size;
	int			length;
	int			type;
	char		nullable;
	char		func;
	char		expr;
	char		quote;
	char		dquote;
	char		numeric;
	char		dot[MAX_TABLE_LEN + 1];
	char		name[MAX_COLUMN_LEN + 1];
	char		alias[MAX_COLUMN_LEN + 1];
} FIELD_INFO;


/********	Statement Handle	***********/
struct StatementClass_
{
	ConnectionClass *hdbc;		/* pointer to ConnectionClass this
								 * statement belongs to */
	QResultClass *result;		/* result of the current statement */
	HSTMT FAR  *phstmt;
	StatementOptions options;

	STMT_Status status;
	char	   *errormsg;
	int			errornumber;

	/* information on bindings */
	BindInfoClass *bindings;	/* array to store the binding information */
	BindInfoClass bookmark;
	int			bindings_allocated;

	/* information on statement parameters */
	int			parameters_allocated;
	ParameterInfoClass *parameters;

	Int4		currTuple;		/* current absolute row number (GetData,
								 * SetPos, SQLFetch) */
	int			save_rowset_size;		/* saved rowset size in case of
										 * change/FETCH_NEXT */
	int			rowset_start;	/* start of rowset (an absolute row
								 * number) */
	int			bind_row;		/* current offset for Multiple row/column
								 * binding */
	int			last_fetch_count;		/* number of rows retrieved in
										 * last fetch/extended fetch */
	int			current_col;	/* current column for GetData -- used to
								 * handle multiple calls */
	int			lobj_fd;		/* fd of the current large object */

	char	   *statement;		/* if non--null pointer to the SQL
								 * statement that has been executed */

	TABLE_INFO **ti;
	FIELD_INFO **fi;
	int			nfld;
	int			ntab;

	int			parse_status;

	int			statement_type; /* According to the defines above */
	int			data_at_exec;	/* Number of params needing SQLPutData */
	int			current_exec_param;		/* The current parameter for
										 * SQLPutData */

	char		put_data;		/* Has SQLPutData been called yet? */

	char		errormsg_created;		/* has an informative error msg
										 * been created?  */
	char		manual_result;	/* Is the statement result manually built? */
	char		prepare;		/* is this statement a prepared statement
								 * or direct */

	char		internal;		/* Is this statement being called
								 * internally? */

	char		cursor_name[MAX_CURSOR_LEN + 1];

	char		*stmt_with_params;	/* statement after
														 * parameter
														 * substitution */
	int		stmt_size_limit;	

	char		pre_executing;	/* This statement is prematurely executing */
	char		inaccurate_result;	/* Current status is PREMATURE but
										 * result is inaccurate */
	char		errormsg_malloced;	/* Current error message is malloed (not in a static variable) ? */
	char		miscinfo;
};

#define SC_get_conn(a)	  (a->hdbc)
#define SC_get_Result(a)  (a->result);

/*	options for SC_free_params() */
#define STMT_FREE_PARAMS_ALL				0
#define STMT_FREE_PARAMS_DATA_AT_EXEC_ONLY	1

/*	misc info */
#define SC_set_pre_executable(a) (a->miscinfo |= 1L)
#define SC_no_pre_executable(a)	(a->miscinfo &= ~1L)
#define SC_is_pre_executable(a)	((a->miscinfo & 1L) != 0)
#define SC_set_fetchcursor(a)	(a->miscinfo |= 2L)
#define SC_no_fetchcursor(a)	(a->miscinfo &= ~2L)
#define SC_is_fetchcursor(a)	((a->miscinfo & 2L) != 0)

/*	Statement prototypes */
StatementClass *SC_Constructor(void);
void		InitializeStatementOptions(StatementOptions *opt);
char		SC_Destructor(StatementClass *self);
int			statement_type(char *statement);
char		parse_statement(StatementClass *stmt);
void		SC_pre_execute(StatementClass *self);
char		SC_unbind_cols(StatementClass *self);
char		SC_recycle_statement(StatementClass *self);

void		SC_clear_error(StatementClass *self);
char		SC_get_error(StatementClass *self, int *number, char **message);
char	   *SC_create_errormsg(StatementClass *self);
RETCODE		SC_execute(StatementClass *self);
RETCODE		SC_fetch(StatementClass *self);
void		SC_free_params(StatementClass *self, char option);
void		SC_log_error(char *func, char *desc, StatementClass *self);
unsigned long SC_get_bookmark(StatementClass *self);


#endif
