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statement.c
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/*------
* Module: statement.c
*
* Description: This module contains functions related to creating
* and manipulating a statement.
*
* Classes: StatementClass (Functions prefix: "SC_")
*
* API functions: SQLAllocStmt, SQLFreeStmt
*
* Comments: See "readme.txt" for copyright and license information.
*-------
*/
#ifdef WIN_MULTITHREAD_SUPPORT
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0400
#endif /* _WIN32_WINNT */
#endif /* WIN_MULTITHREAD_SUPPORT */
#include "statement.h"
#include "misc.h" // strncpy_null
#include "bind.h"
#include "connection.h"
#include "multibyte.h"
#include "qresult.h"
#include "convert.h"
#include "environ.h"
#include "loadlib.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "pgapifunc.h"
/* Map sql commands to statement types */
static const struct
{
int type;
char *s;
} Statement_Type[] =
{
{
STMT_TYPE_SELECT, "SELECT"
}
,{
STMT_TYPE_INSERT, "INSERT"
}
,{
STMT_TYPE_UPDATE, "UPDATE"
}
,{
STMT_TYPE_DELETE, "DELETE"
}
,{
STMT_TYPE_PROCCALL, "CALL"
}
,{
STMT_TYPE_PROCCALL, "{"
}
,{
STMT_TYPE_SET, "SET"
}
,{
STMT_TYPE_RESET, "RESET"
}
,{
STMT_TYPE_CREATE, "CREATE"
}
,{
STMT_TYPE_DECLARE, "DECLARE"
}
,{
STMT_TYPE_FETCH, "FETCH"
}
,{
STMT_TYPE_MOVE, "MOVE"
}
,{
STMT_TYPE_CLOSE, "CLOSE"
}
,{
STMT_TYPE_PREPARE, "PREPARE"
}
,{
STMT_TYPE_EXECUTE, "EXECUTE"
}
,{
STMT_TYPE_DEALLOCATE, "DEALLOCATE"
}
,{
STMT_TYPE_DROP, "DROP"
}
,{
STMT_TYPE_START, "BEGIN"
}
,{
STMT_TYPE_START, "START"
}
,{
STMT_TYPE_TRANSACTION, "SAVEPOINT"
}
,{
STMT_TYPE_TRANSACTION, "RELEASE"
}
,{
STMT_TYPE_TRANSACTION, "COMMIT"
}
,{
STMT_TYPE_TRANSACTION, "END"
}
,{
STMT_TYPE_TRANSACTION, "ROLLBACK"
}
,{
STMT_TYPE_TRANSACTION, "ABORT"
}
,{
STMT_TYPE_LOCK, "LOCK"
}
,{
STMT_TYPE_ALTER, "ALTER"
}
,{
STMT_TYPE_GRANT, "GRANT"
}
,{
STMT_TYPE_REVOKE, "REVOKE"
}
,{
STMT_TYPE_COPY, "COPY"
}
,{
STMT_TYPE_ANALYZE, "ANALYZE"
}
,{
STMT_TYPE_NOTIFY, "NOTIFY"
}
,{
STMT_TYPE_EXPLAIN, "EXPLAIN"
}
/*
* Special-commands that cannot be run in a transaction block. This isn't
* as granular as it could be. VACUUM can never be run in a transaction
* block, but some variants of REINDEX and CLUSTER can be. CHECKPOINT
* doesn't throw an error if you do, but it cannot be rolled back so
* there's no point in beginning a new transaction for it.
*/
,{
STMT_TYPE_SPECIAL, "VACUUM"
}
,{
STMT_TYPE_SPECIAL, "REINDEX"
}
,{
STMT_TYPE_SPECIAL, "CLUSTER"
}
,{
STMT_TYPE_SPECIAL, "CHECKPOINT"
}
,{
STMT_TYPE_WITH, "WITH"
}
,{
0, NULL
}
};
static QResultClass *libpq_bind_and_exec(StatementClass *stmt);
static void SC_set_errorinfo(StatementClass *self, QResultClass *res, int errkind);
static void SC_set_error_if_not_set(StatementClass *self, int errornumber, const char *errmsg, const char *func);
RETCODE SQL_API
PGAPI_AllocStmt(HDBC hdbc,
HSTMT * phstmt, UDWORD flag)
{
CSTR func = "PGAPI_AllocStmt";
ConnectionClass *conn = (ConnectionClass *) hdbc;
StatementClass *stmt;
ARDFields *ardopts;
MYLOG(0, "entering...\n");
if (!conn)
{
CC_log_error(func, "", NULL);
return SQL_INVALID_HANDLE;
}
stmt = SC_Constructor(conn);
MYLOG(0, "**** : hdbc = %p, stmt = %p\n", hdbc, stmt);
if (!stmt)
{
CC_set_error(conn, CONN_STMT_ALLOC_ERROR, "No more memory to allocate a further SQL-statement", func);
*phstmt = SQL_NULL_HSTMT;
return SQL_ERROR;
}
if (!CC_add_statement(conn, stmt))
{
CC_set_error(conn, CONN_STMT_ALLOC_ERROR, "Maximum number of statements exceeded.", func);
SC_Destructor(stmt);
*phstmt = SQL_NULL_HSTMT;
return SQL_ERROR;
}
*phstmt = (HSTMT) stmt;
stmt->iflag = flag;
/* Copy default statement options based from Connection options */
if (0 != (PODBC_INHERIT_CONNECT_OPTIONS & flag))
{
stmt->options = stmt->options_orig = conn->stmtOptions;
stmt->ardi.ardf = conn->ardOptions;
}
else
{
InitializeStatementOptions(&stmt->options_orig);
stmt->options = stmt->options_orig;
InitializeARDFields(&stmt->ardi.ardf);
}
ardopts = SC_get_ARDF(stmt);
ARD_AllocBookmark(ardopts);
/* Save the handle for later */
stmt->phstmt = phstmt;
return SQL_SUCCESS;
}
RETCODE SQL_API
PGAPI_FreeStmt(HSTMT hstmt,
SQLUSMALLINT fOption)
{
CSTR func = "PGAPI_FreeStmt";
StatementClass *stmt = (StatementClass *) hstmt;
MYLOG(0, "entering...hstmt=%p, fOption=%hi\n", hstmt, fOption);
if (!stmt)
{
SC_log_error(func, "", NULL);
return SQL_INVALID_HANDLE;
}
SC_clear_error(stmt);
if (fOption == SQL_DROP)
{
ConnectionClass *conn = stmt->hdbc;
/* Remove the statement from the connection's statement list */
if (conn)
{
QResultClass *res;
if (STMT_EXECUTING == stmt->status)
{
SC_set_error(stmt, STMT_SEQUENCE_ERROR, "Statement is currently executing a transaction.", func);
return SQL_ERROR; /* stmt may be executing a transaction */
}
if (conn->unnamed_prepared_stmt == stmt)
conn->unnamed_prepared_stmt = NULL;
/*
* Free any cursors and discard any result info.
* Don't detach the statement from the connection
* before freeing the associated cursors. Otherwise
* CC_cursor_count() would get wrong results.
*/
if (stmt->parsed)
{
QR_Destructor(stmt->parsed);
stmt->parsed = NULL;
}
res = SC_get_Result(stmt);
QR_Destructor(res);
SC_init_Result(stmt);
if (!CC_remove_statement(conn, stmt))
{
SC_set_error(stmt, STMT_SEQUENCE_ERROR, "Statement is currently executing a transaction.", func);
return SQL_ERROR; /* stmt may be executing a
* transaction */
}
}
if (stmt->execute_delegate)
{
PGAPI_FreeStmt(stmt->execute_delegate, SQL_DROP);
stmt->execute_delegate = NULL;
}
if (stmt->execute_parent)
stmt->execute_parent->execute_delegate = NULL;
/* Destroy the statement and free any results, cursors, etc. */
/* if the connection was already closed return error */
if (SC_Destructor(stmt) == FALSE)
return SQL_ERROR;
}
else if (fOption == SQL_UNBIND)
SC_unbind_cols(stmt);
else if (fOption == SQL_CLOSE)
{
/*
* this should discard all the results, but leave the statement
* itself in place (it can be executed again)
*/
stmt->transition_status = STMT_TRANSITION_ALLOCATED;
if (stmt->execute_delegate)
{
PGAPI_FreeStmt(stmt->execute_delegate, SQL_DROP);
stmt->execute_delegate = NULL;
}
if (!SC_recycle_statement(stmt))
{
return SQL_ERROR;
}
SC_set_Curres(stmt, NULL);
}
else if (fOption == SQL_RESET_PARAMS)
SC_free_params(stmt, STMT_FREE_PARAMS_ALL);
else
{
SC_set_error(stmt, STMT_OPTION_OUT_OF_RANGE_ERROR, "Invalid option passed to PGAPI_FreeStmt.", func);
return SQL_ERROR;
}
return SQL_SUCCESS;
}
/*
* StatementClass implementation
*/
void
InitializeStatementOptions(StatementOptions *opt)
{
memset(opt, 0, sizeof(StatementOptions));
opt->scroll_concurrency = SQL_CONCUR_READ_ONLY;
opt->cursor_type = SQL_CURSOR_FORWARD_ONLY;
opt->retrieve_data = SQL_RD_ON;
opt->use_bookmarks = SQL_UB_OFF;
opt->metadata_id = SQL_FALSE;
}
static void SC_clear_parse_status(StatementClass *self, ConnectionClass *conn)
{
self->parse_status = STMT_PARSE_NONE;
}
static void SC_init_discard_output_params(StatementClass *self)
{
ConnectionClass *conn = SC_get_conn(self);
if (!conn) return;
self->discard_output_params = 0;
if (!conn->connInfo.use_server_side_prepare)
self->discard_output_params = 1;
}
static void SC_init_parse_method(StatementClass *self)
{
ConnectionClass *conn = SC_get_conn(self);
self->parse_method = 0;
if (!conn) return;
if (0 == (PODBC_EXTERNAL_STATEMENT & self->iflag)) return;
if (self->catalog_result) return;
if (conn->connInfo.drivers.parse)
SC_set_parse_forced(self);
}
StatementClass *
SC_Constructor(ConnectionClass *conn)
{
StatementClass *rv;
rv = (StatementClass *) malloc(sizeof(StatementClass));
if (rv)
{
rv->hdbc = conn;
rv->phstmt = NULL;
rv->rhold.first = rv->rhold.last = NULL;
rv->curres = NULL;
rv->parsed = NULL;
rv->catalog_result = FALSE;
rv->prepare = NON_PREPARE_STATEMENT;
rv->prepared = NOT_YET_PREPARED;
rv->status = STMT_ALLOCATED;
rv->external = FALSE;
rv->iflag = 0;
rv->plan_name = NULL;
rv->transition_status = STMT_TRANSITION_UNALLOCATED;
rv->multi_statement = -1; /* unknown */
rv->num_params = -1; /* unknown */
rv->processed_statements = NULL;
rv->__error_message = NULL;
rv->__error_number = 0;
rv->pgerror = NULL;
rv->statement = NULL;
rv->stmt_with_params = NULL;
rv->load_statement = NULL;
rv->statement_type = STMT_TYPE_UNKNOWN;
rv->currTuple = -1;
rv->rowset_start = 0;
SC_set_rowset_start(rv, -1, FALSE);
rv->current_col = -1;
rv->bind_row = 0;
rv->from_pos = rv->load_from_pos = rv->where_pos = -1;
rv->last_fetch_count = rv->last_fetch_count_include_ommitted = 0;
rv->save_rowset_size = -1;
rv->data_at_exec = -1;
rv->current_exec_param = -1;
rv->exec_start_row = -1;
rv->exec_end_row = -1;
rv->exec_current_row = -1;
rv->put_data = FALSE;
rv->ref_CC_error = FALSE;
rv->join_info = 0;
SC_init_parse_method(rv);
rv->lobj_fd = -1;
INIT_NAME(rv->cursor_name);
/* Parse Stuff */
rv->ti = NULL;
rv->ntab = 0;
rv->num_key_fields = -1; /* unknown */
SC_clear_parse_status(rv, conn);
rv->proc_return = -1;
SC_init_discard_output_params(rv);
rv->cancel_info = 0;
/* Clear Statement Options -- defaults will be set in AllocStmt */
memset(&rv->options, 0, sizeof(StatementOptions));
InitializeEmbeddedDescriptor((DescriptorClass *)&(rv->ardi),
rv, SQL_ATTR_APP_ROW_DESC);
InitializeEmbeddedDescriptor((DescriptorClass *)&(rv->apdi),
rv, SQL_ATTR_APP_PARAM_DESC);
InitializeEmbeddedDescriptor((DescriptorClass *)&(rv->irdi),
rv, SQL_ATTR_IMP_ROW_DESC);
InitializeEmbeddedDescriptor((DescriptorClass *)&(rv->ipdi),
rv, SQL_ATTR_IMP_PARAM_DESC);
rv->miscinfo = 0;
rv->execinfo = 0;
rv->rb_or_tc = 0;
SC_reset_updatable(rv);
rv->diag_row_count = 0;
rv->stmt_time = 0;
rv->execute_delegate = NULL;
rv->execute_parent = NULL;
rv->allocated_callbacks = 0;
rv->num_callbacks = 0;
rv->callbacks = NULL;
GetDataInfoInitialize(SC_get_GDTI(rv));
PutDataInfoInitialize(SC_get_PDTI(rv));
rv->use_server_side_prepare = conn->connInfo.use_server_side_prepare;
rv->lock_CC_for_rb = FALSE;
// for batch execution
memset(&rv->stmt_deferred, 0, sizeof(rv->stmt_deferred));
if ((rv->batch_size = conn->connInfo.batch_size) < 1)
rv->batch_size = 1;
rv->exec_type = DIRECT_EXEC;
rv->count_of_deffered = 0;
rv->has_notice = 0;
INIT_STMT_CS(rv);
}
return rv;
}
char
SC_Destructor(StatementClass *self)
{
char cRet = TRUE;
CSTR func = "SC_Destructor";
QResultClass *res = SC_get_Result(self);
MYLOG(0, "entering self=%p, self->result=%p, self->hdbc=%p\n", self, res, self->hdbc);
SC_clear_error(self);
if (STMT_EXECUTING == self->status)
{
SC_set_error(self, STMT_SEQUENCE_ERROR, "Statement is currently executing a transaction.", func);
return FALSE;
}
if (res)
{
if (!self->hdbc)
res->conn = NULL; /* prevent any dbase activity */
QR_Destructor(res);
}
if (self->parsed)
{
QR_Destructor(self->parsed);
self->parsed = NULL;
}
SC_initialize_stmts(self, TRUE);
if(self->hdbc && !self->hdbc->pqconn)
{
SC_set_error(self, STMT_COMMUNICATION_ERROR, "connection error.", func);
cRet = FALSE;
}
/* Free the parsed table information */
SC_initialize_cols_info(self, FALSE, TRUE);
NULL_THE_NAME(self->cursor_name);
/* Free the parsed field information */
DC_Destructor((DescriptorClass *) SC_get_ARDi(self));
DC_Destructor((DescriptorClass *) SC_get_APDi(self));
DC_Destructor((DescriptorClass *) SC_get_IRDi(self));
DC_Destructor((DescriptorClass *) SC_get_IPDi(self));
GDATA_unbind_cols(SC_get_GDTI(self), TRUE);
PDATA_free_params(SC_get_PDTI(self), STMT_FREE_PARAMS_ALL);
if (self->__error_message)
free(self->__error_message);
if (self->pgerror)
ER_Destructor(self->pgerror);
cancelNeedDataState(self);
if (self->callbacks)
free(self->callbacks);
if (!PQExpBufferDataBroken(self->stmt_deferred))
termPQExpBuffer(&self->stmt_deferred);
DELETE_STMT_CS(self);
free(self);
MYLOG(0, "leaving\n");
return cRet;
}
void
SC_init_Result(StatementClass *self)
{
self->rhold.first = self->rhold.last = NULL;
self->curres = NULL;
MYLOG(0, "leaving(%p)\n", self);
}
void
SC_set_Result(StatementClass *self, QResultClass *first)
{
if (first != self->rhold.first)
{
QResultClass *last = NULL, *res;
MYLOG(0, "(%p, %p)\n", self, first);
QR_Destructor(self->parsed);
self->parsed = NULL;
QR_Destructor(self->rhold.first);
for (res = first; res; res = QR_nextr(res))
last = res;
self->curres = first;
self->rhold.first = first;
self->rhold.last = last;
}
}
void
SC_set_ResultHold(StatementClass *self, QResultHold rhold)
{
if (rhold.first != self->rhold.first)
{
MYLOG(0, "(%p, {%p, %p})\n", self, rhold.first, rhold.last);
QR_Destructor(self->parsed);
self->parsed = NULL;
QR_Destructor(self->rhold.first);
self->curres = rhold.first;
self->rhold = rhold;
}
else if (rhold.last != self->rhold.last)
{
self->rhold.last = rhold.last;
if (QR_nextr(rhold.last) != NULL)
SC_set_error(self, STMT_INTERNAL_ERROR, "last Result is not the last result", __FUNCTION__);
}
}
/*
* Free parameters and free the memory from the
* data-at-execution parameters that was allocated in SQLPutData.
*/
void
SC_free_params(StatementClass *self, char option)
{
if (option != STMT_FREE_PARAMS_DATA_AT_EXEC_ONLY)
{
APD_free_params(SC_get_APDF(self), option);
IPD_free_params(SC_get_IPDF(self), option);
}
PDATA_free_params(SC_get_PDTI(self), option);
self->data_at_exec = -1;
self->current_exec_param = -1;
self->put_data = FALSE;
if (option == STMT_FREE_PARAMS_ALL)
{
self->exec_start_row = -1;
self->exec_end_row = -1;
self->exec_current_row = -1;
}
}
int
statement_type(const char *statement)
{
int i;
/* ignore leading whitespace in query string */
while (*statement && (isspace((UCHAR) *statement) || *statement == '('))
statement++;
for (i = 0; Statement_Type[i].s; i++)
if (!strnicmp(statement, Statement_Type[i].s, strlen(Statement_Type[i].s)))
return Statement_Type[i].type;
return STMT_TYPE_OTHER;
}
void
SC_set_planname(StatementClass *stmt, const char *plan_name)
{
if (stmt->plan_name)
free(stmt->plan_name);
if (plan_name && plan_name[0])
stmt->plan_name = strdup(plan_name);
else
stmt->plan_name = NULL;
}
void
SC_set_rowset_start(StatementClass *stmt, SQLLEN start, BOOL valid_base)
{
QResultClass *res = SC_get_Curres(stmt);
SQLLEN incr = start - stmt->rowset_start;
MYLOG(DETAIL_LOG_LEVEL, "%p->SC_set_rowstart " FORMAT_LEN "->" FORMAT_LEN "(%s) ", stmt, stmt->rowset_start, start, valid_base ? "valid" : "unknown");
if (res != NULL)
{
BOOL valid = QR_has_valid_base(res);
MYPRINTF(DETAIL_LOG_LEVEL, ":(%p)QR is %s", res, QR_has_valid_base(res) ? "valid" : "unknown");
if (valid)
{
if (valid_base)
QR_inc_rowstart_in_cache(res, incr);
else
QR_set_no_valid_base(res);
}
else if (valid_base)
{
QR_set_has_valid_base(res);
if (start < 0)
QR_set_rowstart_in_cache(res, -1);
else
QR_set_rowstart_in_cache(res, start);
}
if (!QR_get_cursor(res))
res->key_base = start;
MYPRINTF(DETAIL_LOG_LEVEL, ":(%p)QR result=" FORMAT_LEN "(%s)", res, QR_get_rowstart_in_cache(res), QR_has_valid_base(res) ? "valid" : "unknown");
}
stmt->rowset_start = start;
MYPRINTF(DETAIL_LOG_LEVEL, ":stmt result=" FORMAT_LEN "\n", stmt->rowset_start);
}
void
SC_inc_rowset_start(StatementClass *stmt, SQLLEN inc)
{
SQLLEN start = stmt->rowset_start + inc;
SC_set_rowset_start(stmt, start, TRUE);
}
int
SC_set_current_col(StatementClass *stmt, int col)
{
if (col == stmt->current_col)
return col;
if (col >= 0)
reset_a_getdata_info(SC_get_GDTI(stmt), col + 1);
stmt->current_col = col;
return stmt->current_col;
}
void
SC_set_prepared(StatementClass *stmt, int prepared)
{
if (prepared == stmt->prepared)
;
else if (NOT_YET_PREPARED == prepared && PREPARED_PERMANENTLY == stmt->prepared)
{
ConnectionClass *conn = SC_get_conn(stmt);
if (conn)
{
ENTER_CONN_CS(conn);
if (CONN_CONNECTED == conn->status)
{
if (CC_is_in_error_trans(conn))
{
CC_mark_a_object_to_discard(conn, 's', stmt->plan_name);
}
else
{
QResultClass *res;
char dealloc_stmt[128];
SPRINTF_FIXED(dealloc_stmt, "DEALLOCATE \"%s\"", stmt->plan_name);
res = CC_send_query(conn, dealloc_stmt, NULL, IGNORE_ABORT_ON_CONN | ROLLBACK_ON_ERROR, NULL);
QR_Destructor(res);
}
}
LEAVE_CONN_CS(conn);
}
}
if (NOT_YET_PREPARED == prepared)
SC_set_planname(stmt, NULL);
stmt->prepared = prepared;
}
/*
* Initialize stmt_with_params and load_statement member pointer
* deallocating corresponding prepared plan. Also initialize
* statement member pointer if specified.
*/
RETCODE
SC_initialize_stmts(StatementClass *self, BOOL initializeOriginal)
{
ProcessedStmt *pstmt;
ProcessedStmt *next_pstmt;
ConnectionClass *conn = SC_get_conn(self);
if (self->lock_CC_for_rb)
{
if (conn)
LEAVE_CONN_CS(conn);
self->lock_CC_for_rb = FALSE;
}
if (initializeOriginal)
{
if (self->statement)
{
free(self->statement);
self->statement = NULL;
}
pstmt = self->processed_statements;
while (pstmt)
{
if (pstmt->query)
free(pstmt->query);
next_pstmt = pstmt->next;
free(pstmt);
pstmt = next_pstmt;
}
self->processed_statements = NULL;
self->prepare = NON_PREPARE_STATEMENT;
SC_set_prepared(self, NOT_YET_PREPARED);
self->statement_type = STMT_TYPE_UNKNOWN; /* unknown */
self->multi_statement = -1; /* unknown */
self->num_params = -1; /* unknown */
self->proc_return = -1; /* unknown */
self->join_info = 0;
SC_init_parse_method(self);
SC_init_discard_output_params(self);
if (conn)
self->use_server_side_prepare = conn->connInfo.use_server_side_prepare;
}
if (self->stmt_with_params)
{
free(self->stmt_with_params);
self->stmt_with_params = NULL;
}
if (self->load_statement)
{
free(self->load_statement);
self->load_statement = NULL;
}
self->has_notice = 0;
return 0;
}
/**
* @brief Is the statement currently executing a transaction or cursor
* @param[in] self
* @param func name of calling function
* @return TRUE if statement is executing, otherwise FALSE
*/
BOOL SC_opencheck(StatementClass *self, const char *func)
{
QResultClass *res;
if (!self)
return FALSE;
if (self->status == STMT_EXECUTING)
{
SC_set_error(self, STMT_SEQUENCE_ERROR, "Statement is currently executing a transaction.", func);
return TRUE;
}
/*
* We can dispose the result of Describe-only any time.
*/
if (self->prepare && self->status == STMT_DESCRIBED)
{
MYLOG(0, "self->prepare && self->status == STMT_DESCRIBED\n");
return FALSE;
}
if (res = SC_get_Curres(self), NULL != res)
{
if (QR_command_maybe_successful(res) && res->backend_tuples)
{
SC_set_error(self, STMT_SEQUENCE_ERROR, "The cursor is open.", func);
return TRUE;
}
}
return FALSE;
}
RETCODE
SC_initialize_and_recycle(StatementClass *self)
{
SC_initialize_stmts(self, TRUE);
if (!SC_recycle_statement(self))
return SQL_ERROR;
return SQL_SUCCESS;
}
void
SC_reset_result_for_rerun(StatementClass *self)
{
QResultClass *res;
ColumnInfoClass *flds;
if (!self) return;
if (res = SC_get_Result(self), NULL == res)
return;
flds = QR_get_fields(res);
if (NULL == flds ||
0 == CI_get_num_fields(flds))
SC_set_Result(self, NULL);
else
{
QR_reset_for_re_execute(res);
SC_set_Curres(self, NULL);
}
}
/*
* Called from SQLPrepare if STMT_PREMATURE, or
* from SQLExecute if STMT_FINISHED, or
* from SQLFreeStmt(SQL_CLOSE)
*/
char
SC_recycle_statement(StatementClass *self)
{
CSTR func = "SC_recycle_statement";
ConnectionClass *conn;
MYLOG(0, "entering self=%p\n", self);
SC_clear_error(self);
/* This would not happen */
if (self->status == STMT_EXECUTING)
{
SC_set_error(self, STMT_SEQUENCE_ERROR, "Statement is currently executing a transaction.", func);
return FALSE;
}
if (SC_get_conn(self)->unnamed_prepared_stmt == self)
SC_get_conn(self)->unnamed_prepared_stmt = NULL;
conn = SC_get_conn(self);
switch (self->status)
{
case STMT_ALLOCATED:
/* this statement does not need to be recycled */
return TRUE;
case STMT_READY:
break;
case STMT_DESCRIBED:
break;
case STMT_FINISHED:
break;
default:
SC_set_error(self, STMT_INTERNAL_ERROR, "An internal error occurred while recycling statements", func);
return FALSE;
}
switch (self->prepared)
{
case NOT_YET_PREPARED:
case PREPARED_TEMPORARILY:
/* Free the parsed table/field information */
SC_initialize_cols_info(self, TRUE, TRUE);
MYLOG(DETAIL_LOG_LEVEL, "SC_clear_parse_status\n");
SC_clear_parse_status(self, conn);
break;
}
/* Free any cursors */
if (SC_get_Result(self))
SC_set_Result(self, NULL);
QR_Destructor(self->parsed);
self->parsed = NULL;
self->miscinfo = 0;
self->execinfo = 0;
/* self->rbonerr = 0; Never clear the bits here */
/*
* Reset only parameters that have anything to do with results
*/
self->status = STMT_READY;
self->catalog_result = FALSE; /* not very important */
self->currTuple = -1;
SC_set_rowset_start(self, -1, FALSE);
SC_set_current_col(self, -1);
self->bind_row = 0;
MYLOG(DETAIL_LOG_LEVEL, "statement=%p ommitted=0\n", self);
self->last_fetch_count = self->last_fetch_count_include_ommitted = 0;
self->__error_message = NULL;
self->__error_number = 0;
self->lobj_fd = -1;
SC_free_params(self, STMT_FREE_PARAMS_DATA_AT_EXEC_ONLY);
SC_initialize_stmts(self, FALSE);
cancelNeedDataState(self);
self->cancel_info = 0;
/*
* reset the current attr setting to the original one.
*/
self->options.scroll_concurrency = self->options_orig.scroll_concurrency;
self->options.cursor_type = self->options_orig.cursor_type;
self->options.keyset_size = self->options_orig.keyset_size;
self->options.maxLength = self->options_orig.maxLength;
self->options.maxRows = self->options_orig.maxRows;
return TRUE;
}
/*
* Scan the query wholly or partially (if the next_cmd param specified).
* Also count the number of parameters respectviely.
*/
void
SC_scanQueryAndCountParams(const char *query, const ConnectionClass *conn,
ssize_t *next_cmd, SQLSMALLINT * pcpar,
po_ind_t *multi_st, po_ind_t *proc_return)
{
const char *tstr, *tag = NULL;
size_t taglen = 0;
char tchar, bchar, escape_in_literal = '\0';
char in_literal = FALSE, in_ident_keyword = FALSE,
in_dquote_identifier = FALSE,
in_dollar_quote = FALSE, in_escape = FALSE,
in_line_comment = FALSE, del_found = FALSE;
int comment_level = 0;
po_ind_t multi = FALSE;
SQLSMALLINT num_p;
encoded_str encstr;
MYLOG(0, "entering...\n");
num_p = 0;
if (proc_return)
*proc_return = 0;
if (next_cmd)
*next_cmd = -1;
tstr = query;
make_encoded_str(&encstr, conn, tstr);
for (bchar = '\0', tchar = encoded_nextchar(&encstr); tchar; tchar = encoded_nextchar(&encstr))
{