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execute.c
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/*-------
* Module: execute.c
*
* Description: This module contains routines related to
* preparing and executing an SQL statement.
*
* Classes: n/a
*
* API functions: SQLPrepare, SQLExecute, SQLExecDirect, SQLTransact,
* SQLCancel, SQLNativeSql, SQLParamData, SQLPutData
*
* Comments: See "readme.txt" for copyright and license information.
*-------
*/
#include "psqlodbc.h"
#include "misc.h"
#include <stdio.h>
#include <string.h>
#ifndef WIN32
#include <ctype.h>
#endif /* WIN32 */
#include "environ.h"
#include "connection.h"
#include "statement.h"
#include "qresult.h"
#include "convert.h"
#include "bind.h"
#include "pgtypes.h"
#include "lobj.h"
#include "pgapifunc.h"
/*extern GLOBAL_VALUES globals;*/
/* Perform a Prepare on the SQL statement */
RETCODE SQL_API
PGAPI_Prepare(HSTMT hstmt,
const SQLCHAR FAR * szSqlStr,
SQLINTEGER cbSqlStr)
{
CSTR func = "PGAPI_Prepare";
StatementClass *self = (StatementClass *) hstmt;
RETCODE retval = SQL_SUCCESS;
BOOL prepared;
mylog("%s: entering...\n", func);
#define return DONT_CALL_RETURN_FROM_HERE???
/* StartRollbackState(self); */
/*
* According to the ODBC specs it is valid to call SQLPrepare multiple
* times. In that case, the bound SQL statement is replaced by the new
* one
*/
prepared = self->prepared;
SC_set_prepared(self, NOT_YET_PREPARED);
switch (self->status)
{
case STMT_PREMATURE:
mylog("**** PGAPI_Prepare: STMT_PREMATURE, recycle\n");
SC_recycle_statement(self); /* recycle the statement, but do
* not remove parameter bindings */
break;
case STMT_FINISHED:
mylog("**** PGAPI_Prepare: STMT_FINISHED, recycle\n");
SC_recycle_statement(self); /* recycle the statement, but do
* not remove parameter bindings */
break;
case STMT_ALLOCATED:
mylog("**** PGAPI_Prepare: STMT_ALLOCATED, copy\n");
self->status = STMT_READY;
break;
case STMT_READY:
mylog("**** PGAPI_Prepare: STMT_READY, change SQL\n");
if (NOT_YET_PREPARED != prepared)
SC_recycle_statement(self); /* recycle the statement */
break;
case STMT_EXECUTING:
mylog("**** PGAPI_Prepare: STMT_EXECUTING, error!\n");
SC_set_error(self, STMT_SEQUENCE_ERROR, "PGAPI_Prepare(): The handle does not point to a statement that is ready to be executed", func);
retval = SQL_ERROR;
goto cleanup;
default:
SC_set_error(self, STMT_INTERNAL_ERROR, "An Internal Error has occured -- Unknown statement status.", func);
retval = SQL_ERROR;
goto cleanup;
}
SC_initialize_stmts(self, TRUE);
if (!szSqlStr)
{
SC_set_error(self, STMT_NO_MEMORY_ERROR, "the query is NULL", func);
retval = SQL_ERROR;
goto cleanup;
}
if (!szSqlStr[0])
self->statement = strdup("");
else
self->statement = make_string(szSqlStr, cbSqlStr, NULL, 0);
if (!self->statement)
{
SC_set_error(self, STMT_NO_MEMORY_ERROR, "No memory available to store statement", func);
retval = SQL_ERROR;
goto cleanup;
}
self->prepare = PREPARE_STATEMENT;
self->statement_type = statement_type(self->statement);
/* Check if connection is onlyread (only selects are allowed) */
if (CC_is_onlyread(SC_get_conn(self)) && STMT_UPDATE(self))
{
SC_set_error(self, STMT_EXEC_ERROR, "Connection is readonly, only select statements are allowed.", func);
retval = SQL_ERROR;
goto cleanup;
}
cleanup:
#undef return
inolog("SQLPrepare return=%d\n", retval);
if (self->internal)
retval = DiscardStatementSvp(self, retval, FALSE);
return retval;
}
/* Performs the equivalent of SQLPrepare, followed by SQLExecute. */
RETCODE SQL_API
PGAPI_ExecDirect(HSTMT hstmt,
const SQLCHAR FAR * szSqlStr,
SQLINTEGER cbSqlStr,
UWORD flag)
{
StatementClass *stmt = (StatementClass *) hstmt;
RETCODE result;
CSTR func = "PGAPI_ExecDirect";
const ConnectionClass *conn = SC_get_conn(stmt);
mylog("%s: entering...%x\n", func, flag);
if (result = SC_initialize_and_recycle(stmt), SQL_SUCCESS != result)
return result;
/*
* keep a copy of the un-parametrized statement, in case they try to
* execute this statement again
*/
stmt->statement = make_string(szSqlStr, cbSqlStr, NULL, 0);
inolog("a2\n");
if (!stmt->statement)
{
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "No memory available to store statement", func);
return SQL_ERROR;
}
mylog("**** %s: hstmt=%p, statement='%s'\n", func, hstmt, stmt->statement);
if (0 != (flag & PODBC_WITH_HOLD))
SC_set_with_hold(stmt);
/*
* If an SQLPrepare was performed prior to this, but was left in the
* premature state because an error occurred prior to SQLExecute then
* set the statement to finished so it can be recycled.
*/
if (stmt->status == STMT_PREMATURE)
stmt->status = STMT_FINISHED;
stmt->statement_type = statement_type(stmt->statement);
/* Check if connection is onlyread (only selects are allowed) */
if (CC_is_onlyread(conn) && STMT_UPDATE(stmt))
{
SC_set_error(stmt, STMT_EXEC_ERROR, "Connection is readonly, only select statements are allowed.", func);
return SQL_ERROR;
}
mylog("%s: calling PGAPI_Execute...\n", func);
flag = SC_is_with_hold(stmt) ? PODBC_WITH_HOLD : 0;
result = PGAPI_Execute(hstmt, flag);
mylog("%s: returned %hd from PGAPI_Execute\n", func, result);
return result;
}
static int
inquireHowToPrepare(const StatementClass *stmt)
{
ConnectionClass *conn;
ConnInfo *ci;
int ret = 0;
conn = SC_get_conn(stmt);
ci = &(conn->connInfo);
if (!ci->use_server_side_prepare)
{
/* Do prepare operations by the driver itself */
return PREPARE_BY_THE_DRIVER;
}
if (NOT_YET_PREPARED == stmt->prepared)
{
SQLSMALLINT num_params;
if (STMT_TYPE_DECLARE == stmt->statement_type &&
PG_VERSION_LT(conn, 8.0))
{
return PREPARE_BY_THE_DRIVER;
}
if (stmt->multi_statement < 0)
PGAPI_NumParams((StatementClass *) stmt, &num_params);
if (stmt->multi_statement > 0)
{
/*
* divide the query into multiple commands and apply V3 parse
* requests for each of them
*/
ret = PARSE_REQ_FOR_INFO;
}
else
{
if (SC_may_use_cursor(stmt))
{
if (ci->drivers.use_declarefetch)
return PARSE_REQ_FOR_INFO;
else if (SQL_CURSOR_FORWARD_ONLY != stmt->options.cursor_type)
ret = PARSE_REQ_FOR_INFO;
else
ret = PARSE_TO_EXEC_ONCE;
}
else
ret = PARSE_TO_EXEC_ONCE;
}
}
if (SC_is_prepare_statement(stmt) && (PARSE_TO_EXEC_ONCE == ret))
ret = NAMED_PARSE_REQUEST;
return ret;
}
int
decideHowToPrepare(StatementClass *stmt, BOOL force)
{
int method = SC_get_prepare_method(stmt);
if (0 != method) /* a method was already determined */
return method;
if (stmt->inaccurate_result)
return method;
switch (stmt->prepare)
{
case NON_PREPARE_STATEMENT: /* not a prepare statement */
if (!force)
return method;
break;
}
method = inquireHowToPrepare(stmt);
stmt->prepare |= method;
if (PREPARE_BY_THE_DRIVER == method)
stmt->discard_output_params = 1;
return method;
}
/* dont/should/can send Parse request ? */
enum {
doNothing = 0
,allowParse
,preferParse
,shouldParse
,usingCommand
};
#define ONESHOT_CALL_PARSE allowParse
#define NOPARAM_ONESHOT_CALL_PARSE doNothing
static
int HowToPrepareBeforeExec(StatementClass *stmt, BOOL checkOnly)
{
SQLSMALLINT num_params = stmt->num_params;
ConnectionClass *conn = SC_get_conn(stmt);
ConnInfo *ci = &(conn->connInfo);
int nCallParse = doNothing, how_to_prepare = 0;
BOOL bNeedsTrans = FALSE;
if (num_params < 0)
PGAPI_NumParams(stmt, &num_params);
how_to_prepare = decideHowToPrepare(stmt, checkOnly);
if (checkOnly)
{
if (num_params <= 0)
return doNothing;
}
else
{
switch (how_to_prepare)
{
case NAMED_PARSE_REQUEST:
return shouldParse;
case PARSE_TO_EXEC_ONCE:
switch (stmt->prepared)
{
case PREPARED_TEMPORARILY:
nCallParse = preferParse;
break;
default:
if (num_params <= 0)
nCallParse = NOPARAM_ONESHOT_CALL_PARSE;
else
nCallParse = ONESHOT_CALL_PARSE;
}
break;
default:
return doNothing;
}
}
if (num_params > 0)
{
int param_number = -1;
ParameterInfoClass *apara;
ParameterImplClass *ipara;
OID pgtype;
while (TRUE)
{
SC_param_next(stmt, ¶m_number, &apara, &ipara);
if (!ipara || !apara)
break;
pgtype = PIC_get_pgtype(*ipara);
if (checkOnly)
{
switch (ipara->SQLType)
{
case SQL_LONGVARBINARY:
if (0 == pgtype)
{
if (ci->bytea_as_longvarbinary &&
0 != conn->lobj_type)
nCallParse = shouldParse;
}
break;
case SQL_CHAR:
if (ci->cvt_null_date_string)
nCallParse = shouldParse;
break;
case SQL_VARCHAR:
if (ci->drivers.bools_as_char &&
PG_WIDTH_OF_BOOLS_AS_CHAR == ipara->column_size)
nCallParse = shouldParse;
break;
}
}
else
{
BOOL bBytea = FALSE;
switch (ipara->SQLType)
{
case SQL_LONGVARBINARY:
if (conn->lobj_type == pgtype || PG_TYPE_OID == pgtype)
bNeedsTrans = TRUE;
else if (PG_TYPE_BYTEA == pgtype)
bBytea = TRUE;
else if (0 == pgtype)
{
if (ci->bytea_as_longvarbinary)
bBytea = TRUE;
else
bNeedsTrans = TRUE;
}
if (bBytea)
if (nCallParse < preferParse)
nCallParse = preferParse;
break;
}
}
}
}
if (bNeedsTrans &&
PARSE_TO_EXEC_ONCE == how_to_prepare)
{
if (!CC_is_in_trans(conn) && CC_does_autocommit(conn))
nCallParse = doNothing;
}
return nCallParse;
}
/*
* The execution after all parameters were resolved.
*/
static
RETCODE Exec_with_parameters_resolved(StatementClass *stmt, BOOL *exec_end)
{
CSTR func = "Exec_with_parameters_resolved";
RETCODE retval;
SQLLEN end_row;
SQLINTEGER cursor_type, scroll_concurrency;
ConnectionClass *conn;
QResultClass *res;
APDFields *apdopts;
IPDFields *ipdopts;
BOOL prepare_before_exec = FALSE;
*exec_end = FALSE;
conn = SC_get_conn(stmt);
mylog("%s: copying statement params: trans_status=%d, len=%d, stmt='%s'\n", func, conn->transact_status, strlen(stmt->statement), stmt->statement);
#define return DONT_CALL_RETURN_FROM_HERE???
#define RETURN(code) { retval = code; goto cleanup; }
ENTER_CONN_CS(conn);
/* save the cursor's info before the execution */
cursor_type = stmt->options.cursor_type;
scroll_concurrency = stmt->options.scroll_concurrency;
/* Prepare the statement if possible at backend side */
if (!stmt->inaccurate_result)
{
if (HowToPrepareBeforeExec(stmt, FALSE) >= allowParse)
prepare_before_exec = TRUE;
}
inolog("prepare_before_exec=%d srv=%d\n", prepare_before_exec, conn->connInfo.use_server_side_prepare);
/* Create the statement with parameters substituted. */
retval = copy_statement_with_parameters(stmt, prepare_before_exec);
stmt->current_exec_param = -1;
if (retval != SQL_SUCCESS)
{
stmt->exec_current_row = -1;
*exec_end = TRUE;
RETURN(retval) /* error msg is passed from the above */
}
mylog(" stmt_with_params = '%s'\n", stmt->stmt_with_params);
/*
* Dummy exection to get the column info.
*/
if (stmt->inaccurate_result && SC_is_parse_tricky(stmt))
{
BOOL in_trans = CC_is_in_trans(conn);
BOOL issued_begin = FALSE;
QResultClass *curres;
stmt->exec_current_row = -1;
*exec_end = TRUE;
if (!SC_is_pre_executable(stmt))
RETURN(SQL_SUCCESS)
if (strnicmp(stmt->stmt_with_params, "BEGIN;", 6) == 0)
{
/* do nothing */
}
else if (!in_trans)
{
if (issued_begin = CC_begin(conn), !issued_begin)
{
SC_set_error(stmt, STMT_EXEC_ERROR, "Handle prepare error", func);
RETURN(SQL_ERROR)
}
}
/* we are now in a transaction */
res = CC_send_query(conn, stmt->stmt_with_params, NULL, 0, SC_get_ancestor(stmt));
if (!QR_command_maybe_successful(res))
{
#ifndef _LEGACY_MODE_
if (PG_VERSION_LT(conn, 8.0))
CC_abort(conn);
#endif /* LEGACY_MODE_ */
SC_set_error(stmt, STMT_EXEC_ERROR, "Handle prepare error", func);
QR_Destructor(res);
RETURN(SQL_ERROR)
}
SC_set_Result(stmt, res);
for (curres = res; !curres->num_fields; curres = curres->next)
;
SC_set_Curres(stmt, curres);
if (CC_does_autocommit(conn))
{
if (issued_begin)
CC_commit(conn);
}
stmt->status = STMT_FINISHED;
RETURN(SQL_SUCCESS)
}
/*
* The real execution.
*/
mylog("about to begin SC_execute\n");
retval = SC_execute(stmt);
if (retval == SQL_ERROR)
{
stmt->exec_current_row = -1;
*exec_end = TRUE;
RETURN(retval)
}
res = SC_get_Result(stmt);
/* special handling of result for keyset driven cursors */
if (SQL_CURSOR_KEYSET_DRIVEN == stmt->options.cursor_type &&
SQL_CONCUR_READ_ONLY != stmt->options.scroll_concurrency)
{
QResultClass *kres;
if (kres = res->next, kres)
{
QR_set_fields(kres, QR_get_fields(res));
QR_set_fields(res, NULL);
kres->num_fields = res->num_fields;
res->next = NULL;
SC_set_Result(stmt, kres);
res = kres;
}
}
ipdopts = SC_get_IPDF(stmt);
if (ipdopts->param_status_ptr)
{
switch (retval)
{
case SQL_SUCCESS:
ipdopts->param_status_ptr[stmt->exec_current_row] = SQL_PARAM_SUCCESS;
break;
case SQL_SUCCESS_WITH_INFO:
ipdopts->param_status_ptr[stmt->exec_current_row] = SQL_PARAM_SUCCESS_WITH_INFO;
break;
default:
ipdopts->param_status_ptr[stmt->exec_current_row] = SQL_PARAM_ERROR;
break;
}
}
if (end_row = stmt->exec_end_row, end_row < 0)
{
apdopts = SC_get_APDF(stmt);
end_row = (SQLINTEGER) apdopts->paramset_size - 1;
}
if (stmt->inaccurate_result ||
stmt->exec_current_row >= end_row)
{
*exec_end = TRUE;
stmt->exec_current_row = -1;
}
else
stmt->exec_current_row++;
if (res)
{
EnvironmentClass *env = (EnvironmentClass *) CC_get_env(conn);
const char *cmd = QR_get_command(res);
SQLLEN start_row;
if (start_row = stmt->exec_start_row, start_row < 0)
start_row = 0;
if (retval == SQL_SUCCESS &&
NULL != cmd &&
start_row >= end_row &&
NULL != env &&
EN_is_odbc3(env))
{
int count;
if (sscanf(cmd , "UPDATE %d", &count) == 1)
;
else if (sscanf(cmd , "DELETE %d", &count) == 1)
;
else
count = -1;
if (0 == count)
retval = SQL_NO_DATA;
}
stmt->diag_row_count = res->recent_processed_row_count;
}
/*
* The cursor's info was changed ?
*/
if (retval == SQL_SUCCESS &&
(stmt->options.cursor_type != cursor_type ||
stmt->options.scroll_concurrency != scroll_concurrency))
{
SC_set_error(stmt, STMT_OPTION_VALUE_CHANGED, "cursor updatability changed", func);
retval = SQL_SUCCESS_WITH_INFO;
}
cleanup:
#undef RETURN
#undef return
LEAVE_CONN_CS(conn);
return retval;
}
int
StartRollbackState(StatementClass *stmt)
{
CSTR func = "StartRollbackState";
int ret;
ConnectionClass *conn;
ConnInfo *ci = NULL;
inolog("%s:%p->internal=%d\n", func, stmt, stmt->internal);
conn = SC_get_conn(stmt);
if (conn)
ci = &conn->connInfo;
if (!ci || ci->rollback_on_error < 0) /* default */
{
if (conn && PG_VERSION_GE(conn, 8.0))
ret = 2; /* statement rollback */
else
ret = 1; /* transaction rollback */
}
else
{
ret = ci->rollback_on_error;
if (2 == ret && PG_VERSION_LT(conn, 8.0))
ret = 1;
}
switch (ret)
{
case 1:
SC_start_tc_stmt(stmt);
break;
case 2:
SC_start_rb_stmt(stmt);
break;
}
return ret;
}
/*
* Must be in a transaction or the subsequent execution
* invokes a transaction.
*/
RETCODE
SetStatementSvp(StatementClass *stmt)
{
CSTR func = "SetStatementSvp";
char esavepoint[32], cmd[64];
ConnectionClass *conn = SC_get_conn(stmt);
QResultClass *res;
RETCODE ret = SQL_SUCCESS_WITH_INFO;
if (CC_is_in_error_trans(conn))
return ret;
if (0 == stmt->lock_CC_for_rb)
{
ENTER_CONN_CS(conn);
stmt->lock_CC_for_rb++;
}
switch (stmt->statement_type)
{
case STMT_TYPE_SPECIAL:
case STMT_TYPE_TRANSACTION:
return ret;
}
if (!SC_accessed_db(stmt))
{
BOOL need_savep = FALSE;
if (stmt->internal)
{
if (PG_VERSION_GE(conn, 8.0))
SC_start_rb_stmt(stmt);
else
SC_start_tc_stmt(stmt);
}
if (SC_is_rb_stmt(stmt))
{
if (CC_is_in_trans(conn))
{
need_savep = TRUE;
}
}
if (need_savep)
{
sprintf(esavepoint, "_EXEC_SVP_%p", stmt);
snprintf(cmd, sizeof(cmd), "SAVEPOINT %s", esavepoint);
res = CC_send_query(conn, cmd, NULL, 0, NULL);
if (QR_command_maybe_successful(res))
{
SC_set_accessed_db(stmt);
SC_start_rbpoint(stmt);
ret = SQL_SUCCESS;
}
else
{
SC_set_error(stmt, STMT_INTERNAL_ERROR, "internal SAVEPOINT failed", func);
ret = SQL_ERROR;
}
QR_Destructor(res);
}
else
SC_set_accessed_db(stmt);
}
inolog("%s:%p->accessed=%d\n", func, stmt, SC_accessed_db(stmt));
return ret;
}
RETCODE
DiscardStatementSvp(StatementClass *stmt, RETCODE ret, BOOL errorOnly)
{
CSTR func = "DiscardStatementSvp";
char esavepoint[32], cmd[64];
ConnectionClass *conn = SC_get_conn(stmt);
QResultClass *res;
BOOL cmd_success, start_stmt = FALSE;
inolog("%s:%p->accessed=%d is_in=%d is_rb=%d is_tc=%d\n", func, stmt, SC_accessed_db(stmt),
CC_is_in_trans(conn), SC_is_rb_stmt(stmt), SC_is_tc_stmt(stmt));
switch (ret)
{
case SQL_NEED_DATA:
break;
case SQL_ERROR:
start_stmt = TRUE;
break;
default:
if (!errorOnly)
start_stmt = TRUE;
break;
}
if (!SC_accessed_db(stmt) || !CC_is_in_trans(conn))
goto cleanup;
if (!SC_is_rb_stmt(stmt) && !SC_is_tc_stmt(stmt))
goto cleanup;
sprintf(esavepoint, "_EXEC_SVP_%p", stmt);
if (SQL_ERROR == ret)
{
if (SC_started_rbpoint(stmt))
{
snprintf(cmd, sizeof(cmd), "ROLLBACK to %s", esavepoint);
res = CC_send_query(conn, cmd, NULL, IGNORE_ABORT_ON_CONN, NULL);
cmd_success = QR_command_maybe_successful(res);
QR_Destructor(res);
if (!cmd_success)
{
SC_set_error(stmt, STMT_INTERNAL_ERROR, "internal ROLLBACK failed", func);
CC_abort(conn);
goto cleanup;
}
}
else
{
CC_abort(conn);
goto cleanup;
}
}
else if (errorOnly)
return ret;
inolog("ret=%d\n", ret);
if (SQL_NEED_DATA != ret && SC_started_rbpoint(stmt))
{
snprintf(cmd, sizeof(cmd), "RELEASE %s", esavepoint);
res = CC_send_query(conn, cmd, NULL, IGNORE_ABORT_ON_CONN, NULL);
cmd_success = QR_command_maybe_successful(res);
QR_Destructor(res);
if (!cmd_success)
{
SC_set_error(stmt, STMT_INTERNAL_ERROR, "internal RELEASE failed", func);
CC_abort(conn);
ret = SQL_ERROR;
}
}
cleanup:
if (SQL_NEED_DATA != ret)
SC_forget_unnamed(stmt); /* unnamed plan is no longer reliable */
if (!SC_is_prepare_statement(stmt) && ONCE_DESCRIBED == stmt->prepared)
SC_set_prepared(stmt, NOT_YET_PREPARED);
if (start_stmt || SQL_ERROR == ret)
{
if (stmt->lock_CC_for_rb > 0)
{
LEAVE_CONN_CS(conn);
stmt->lock_CC_for_rb--;
}
SC_start_stmt(stmt);
}
return ret;
}
void
SC_setInsertedTable(StatementClass *stmt, RETCODE retval)
{
const char *cmd = stmt->statement, *ptr;
ConnectionClass *conn;
size_t len;
if (STMT_TYPE_INSERT != stmt->statement_type)
return;
if (SQL_NEED_DATA == retval)
return;
conn = SC_get_conn(stmt);
#ifdef NOT_USED /* give up the use of lastval() */
if (PG_VERSION_GE(conn, 8.1)) /* lastval() is available */
return;
#endif /* NOT_USED */
/*if (!CC_fake_mss(conn))
return;*/
while (isspace((UCHAR) *cmd)) cmd++;
if (!*cmd)
return;
len = 6;
if (strnicmp(cmd, "insert", len))
return;
cmd += len;
while (isspace((UCHAR) *(++cmd)));
if (!*cmd)
return;
len = 4;
if (strnicmp(cmd, "into", len))
return;
cmd += len;
while (isspace((UCHAR) *(++cmd)));
if (!*cmd)
return;
NULL_THE_NAME(conn->schemaIns);
NULL_THE_NAME(conn->tableIns);
if (!SQL_SUCCEEDED(retval))
return;
while (TRUE)
{
if (IDENTIFIER_QUOTE == *cmd)
{
if (ptr = strchr(cmd + 1, IDENTIFIER_QUOTE), NULL == ptr) /* syntax error */
{
NULL_THE_NAME(conn->schemaIns);
NULL_THE_NAME(conn->tableIns);
break;
}
len = ptr - cmd - 1;
cmd++;
ptr++;
}
else
{
if (ptr = strchr(cmd + 1, '.'), NULL != ptr)
len = ptr - cmd;
else
{
ptr = cmd;
while (*ptr && !isspace((UCHAR) *ptr)) ptr++;
len = ptr - cmd;
}
}
if (NAME_IS_VALID(conn->tableIns))
MOVE_NAME(conn->schemaIns, conn->tableIns);
STRN_TO_NAME(conn->tableIns, cmd, len);
if ('.' == *ptr)
cmd = ptr + 1;
else
break;
}
}
/* Execute a prepared SQL statement */
RETCODE SQL_API
PGAPI_Execute(HSTMT hstmt, UWORD flag)
{
CSTR func = "PGAPI_Execute";
StatementClass *stmt = (StatementClass *) hstmt;
RETCODE retval = SQL_SUCCESS;
ConnectionClass *conn;
APDFields *apdopts;
IPDFields *ipdopts;
SQLLEN i, start_row, end_row;
BOOL exec_end, recycled = FALSE, recycle = TRUE;
SQLSMALLINT num_params;
mylog("%s: entering...%x\n", func, flag);
conn = SC_get_conn(stmt);
apdopts = SC_get_APDF(stmt);
/*
* If the statement is premature, it means we already executed it from
* an SQLPrepare/SQLDescribeCol type of scenario. So just return
* success.
*/
if (stmt->prepare && stmt->status == STMT_PREMATURE)
{
if (stmt->inaccurate_result)
{
stmt->exec_current_row = -1;
SC_recycle_statement(stmt);
}
else
{
stmt->status = STMT_FINISHED;
if (NULL == SC_get_errormsg(stmt))
{
mylog("%s: premature statement but return SQL_SUCCESS\n", func);
retval = SQL_SUCCESS;
goto cleanup;
}
else
{
SC_set_error(stmt,STMT_INTERNAL_ERROR, "premature statement so return SQL_ERROR", func);
retval = SQL_ERROR;
goto cleanup;
}
}
}
mylog("%s: clear errors...\n", func);
SC_clear_error(stmt);
if (!stmt->statement)
{
SC_set_error(stmt, STMT_NO_STMTSTRING, "This handle does not have a SQL statement stored in it", func);
mylog("%s: problem with handle\n", func);
return SQL_ERROR;
}
#define return DONT_CALL_RETURN_FROM_HERE???
if (stmt->exec_current_row > 0)
{
/*
* executing an array of parameters.
* Don't recycle the statement.
*/
recycle = FALSE;
}
else if (PREPARED_PERMANENTLY == stmt->prepared ||
PREPARED_TEMPORARILY == stmt->prepared)
{
/*
* re-executing an prepared statement.
* Don't recycle the statement but
* discard the old result.
*/
recycle = FALSE;
SC_reset_result_for_rerun(stmt);
}
/*
* If SQLExecute is being called again, recycle the statement. Note
* this should have been done by the application in a call to
* SQLFreeStmt(SQL_CLOSE) or SQLCancel.
*/
else if (stmt->status == STMT_FINISHED)
{
mylog("%s: recycling statement (should have been done by app)...\n", func);
/******** Is this really NEEDED ? ******/
SC_recycle_statement(stmt);
recycled = TRUE;
}
/* Check if the statement is in the correct state */
else if ((stmt->prepare && stmt->status != STMT_READY) ||
(stmt->status != STMT_ALLOCATED && stmt->status != STMT_READY))
{
SC_set_error(stmt, STMT_STATUS_ERROR, "The handle does not point to a statement that is ready to be executed", func);
mylog("%s: problem with statement\n", func);
retval = SQL_ERROR;
goto cleanup;
}
if (start_row = stmt->exec_start_row, start_row < 0)
start_row = 0;
if (end_row = stmt->exec_end_row, end_row < 0)
end_row = (SQLINTEGER) apdopts->paramset_size - 1;
if (stmt->exec_current_row < 0)
stmt->exec_current_row = start_row;
ipdopts = SC_get_IPDF(stmt);
num_params = stmt->num_params;
if (num_params < 0)
PGAPI_NumParams(stmt, &num_params);
if (stmt->exec_current_row == start_row)
{
/*
We sometimes need to know about the PG type of binding
parameters even in case of non-prepared statements.
*/
int nCallParse = doNothing;
if (NOT_YET_PREPARED == stmt->prepared)
{
switch (nCallParse = HowToPrepareBeforeExec(stmt, TRUE))
{
case shouldParse:
if (retval = prepareParameters(stmt), SQL_ERROR == retval)
goto cleanup;
break;
}
}
mylog("prepareParameters was %s called, prepare state:%d\n", shouldParse == nCallParse ? "" : "not", stmt->prepare);
if (ipdopts->param_processed_ptr)
*ipdopts->param_processed_ptr = 0;
/*
* Initialize param_status_ptr
*/
if (ipdopts->param_status_ptr)
{