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parse.c
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parse.c
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/*--------
* Module: parse.c
*
* Description: This module contains routines related to parsing SQL
* statements. This can be useful for two reasons:
*
* 1. So the query does not actually have to be executed
* to return data about it
*
* 2. To be able to return information about precision,
* nullability, aliases, etc. in the functions
* SQLDescribeCol and SQLColAttributes. Currently,
* Postgres doesn't return any information about
* these things in a query.
*
* Classes: none
*
* API functions: none
*
* Comments: See "readme.txt" for copyright and license information.
*--------
*/
/* Multibyte support Eiji Tokuya 2001-03-15 */
#include "psqlodbc.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "statement.h"
#include "connection.h"
#include "qresult.h"
#include "pgtypes.h"
#include "pgapifunc.h"
#include "catfunc.h"
#include "multibyte.h"
#include "misc.h"
#define FLD_INCR 32
#define TAB_INCR 8
#define COLI_INCR 16
#define COLI_RECYCLE 128
static const char *getNextToken(int ccsc, char escape_in_literal, const char *s, char *token, int smax, char *delim, char *quote, char *dquote, char *numeric);
static void getColInfo(COL_INFO *col_info, FIELD_INFO *fi, int k);
static char searchColInfo(COL_INFO *col_info, FIELD_INFO *fi);
static BOOL getColumnsInfo(ConnectionClass *, TABLE_INFO *, OID, StatementClass *);
Int4 FI_precision(const FIELD_INFO *fi)
{
OID ftype;
if (!fi) return -1;
ftype = FI_type(fi);
switch (ftype)
{
case PG_TYPE_NUMERIC:
return fi->column_size;
case PG_TYPE_DATETIME:
case PG_TYPE_TIMESTAMP_NO_TMZONE:
return fi->decimal_digits;
}
return 0;
}
Int4 FI_scale(const FIELD_INFO *fi)
{
OID ftype;
if (!fi) return -1;
ftype = FI_type(fi);
switch (ftype)
{
case PG_TYPE_NUMERIC:
return fi->decimal_digits;
}
return 0;
}
static const char *
getNextToken(
int ccsc, /* client encoding */
char escape_ch,
const char *s, char *token, int smax, char *delim, char *quote, char *dquote, char *numeric)
{
size_t out = 0;
size_t taglen;
char in_quote, in_dollar_quote, in_escape;
const UCHAR *tag, *tagend;
encoded_str encstr;
char escape_in_literal;
const UCHAR *tstr = (const UCHAR *) s;
UCHAR tchar, qc;
if (smax <= 1)
return NULL;
smax--;
/* skip leading delimiters */
while (isspace(*tstr) || *tstr == ',')
{
/* MYLOG(0, "skipping '%c'\n", *tstr); */
tstr++;
}
if (*tstr == '\0')
{
token[0] = '\0';
return NULL;
}
if (quote)
*quote = FALSE;
if (dquote)
*dquote = FALSE;
if (numeric)
*numeric = FALSE;
encoded_str_constr(&encstr, ccsc, (const char *) tstr);
/* get the next token */
for (tchar = encoded_nextchar(&encstr); tchar && out < smax; tstr++, tchar = encoded_nextchar(&encstr))
{
if (MBCS_NON_ASCII(encstr))
{
token[out++] = tchar;
continue;
}
if (isspace(tchar) || tchar == ',')
break;
/* Handle quoted stuff */
in_quote = in_dollar_quote = FALSE;
taglen = 0;
tag = NULL;
escape_in_literal = '\0';
if (out == 0)
{
qc = tchar;
if (qc == DOLLAR_QUOTE)
{
in_quote = in_dollar_quote = TRUE;
tag = tstr;
taglen = 1;
if (tagend = (const UCHAR *) strchr((const char *) tstr + 1, DOLLAR_QUOTE), NULL != tagend)
taglen = tagend - tstr + 1;
tstr += (taglen - 1);
encoded_position_shift(&encstr, taglen - 1);
if (quote)
*quote = TRUE;
}
else if (qc == LITERAL_QUOTE)
{
in_quote = TRUE;
if (quote)
*quote = TRUE;
escape_in_literal = escape_ch;
if (!escape_in_literal)
{
if (LITERAL_EXT == tstr[-1])
escape_in_literal = ESCAPE_IN_LITERAL;
}
}
else if (qc == IDENTIFIER_QUOTE)
{
in_quote = TRUE;
if (dquote)
*dquote = TRUE;
}
} /* out == 0 */
if (in_quote) /* dquote, dollar_quote */
{
in_escape = FALSE;
for (tstr++, tchar = encoded_nextchar(&encstr); tchar != '\0' && out != smax; tstr++, tchar = encoded_nextchar(&encstr))
{
if (MBCS_NON_ASCII(encstr))
{
token[out++] = tchar;
continue;
}
if (in_escape)
in_escape = FALSE;
else if (tchar == qc)
{
if (!in_dollar_quote)
{
/*
* Peek at the next byte to see if this is a '' or
* "", i.e a quote character that has been escaped
* by doubling it.
*/
if (tstr[1] == qc)
{
tstr++;
tchar = encoded_nextchar(&encstr);
}
else
break;
}
else if (strncmp((const char *) tstr, (const char *) tag, taglen) == 0)
{
tstr += (taglen - 1);
tchar = encoded_position_shift(&encstr, taglen - 1);
break;
}
token[out++] = tchar;
}
else if (LITERAL_QUOTE == qc && tchar == escape_in_literal)
{
in_escape = TRUE;
}
else
{
token[out++] = tchar;
}
} /* for */
if (tchar == qc)
tstr++;
break;
} /* in_quote */
/* Check for numeric literals */
if (out == 0 && isdigit(tchar))
{
if (numeric)
*numeric = TRUE;
token[out++] = tchar;
tstr++;
while ((isalnum(*tstr) || *tstr == '.') && out < smax)
{
token[out++] = *tstr;
tstr++;
}
break;
}
if (ispunct(tchar) && tchar != '_')
{
MYLOG(0, "got ispunct: s[] = '%c'\n", tchar);
if (out == 0)
{
token[out++] = tchar;
tstr++;
}
break;
}
if (out < smax)
token[out++] = tchar;
} /* for */
/* MYLOG(0, "done -- s[] = '%c'\n", *tstr); */
token[out] = '\0';
/* find the delimiter */
while (isspace(*tstr))
tstr++;
/* return the most priority delimiter */
if (*tstr == ',')
{
if (delim)
*delim = *tstr;
}
else if (*tstr == '\0')
{
if (delim)
*delim = '\0';
}
else
{
if (delim)
*delim = ' ';
}
/* skip trailing blanks */
while (isspace(*tstr))
tstr++;
return (const char *) tstr;
}
static void
getColInfo(COL_INFO *col_info, FIELD_INFO *fi, int k)
{
char *str;
MYLOG(DETAIL_LOG_LEVEL, "entering non-manual result\n");
fi->dquote = TRUE;
STR_TO_NAME(fi->column_name, QR_get_value_backend_text(col_info->result, k, COLUMNS_COLUMN_NAME));
fi->columntype = (OID) QR_get_value_backend_int(col_info->result, k, COLUMNS_FIELD_TYPE, NULL);
fi->column_size = QR_get_value_backend_int(col_info->result, k, COLUMNS_PRECISION, NULL);
fi->length = QR_get_value_backend_int(col_info->result, k, COLUMNS_LENGTH, NULL);
if (str = QR_get_value_backend_text(col_info->result, k, COLUMNS_SCALE), str)
fi->decimal_digits = atoi(str);
else
fi->decimal_digits = -1;
fi->nullable = QR_get_value_backend_int(col_info->result, k, COLUMNS_NULLABLE, NULL);
fi->display_size = QR_get_value_backend_int(col_info->result, k, COLUMNS_DISPLAY_SIZE, NULL);
fi->auto_increment = QR_get_value_backend_int(col_info->result, k, COLUMNS_AUTO_INCREMENT, NULL);
}
static char
searchColInfo(COL_INFO *col_info, FIELD_INFO *fi)
{
int k,
cmp, attnum, atttypmod;
OID basetype;
const char *col;
MYLOG(DETAIL_LOG_LEVEL, "entering num_cols=" FORMAT_ULEN " col=%s\n", QR_get_num_cached_tuples(col_info->result), PRINT_NAME(fi->column_name));
if (fi->attnum < 0)
return FALSE;
for (k = 0; k < QR_get_num_cached_tuples(col_info->result); k++)
{
if (fi->attnum > 0)
{
attnum = QR_get_value_backend_int(col_info->result, k, COLUMNS_PHYSICAL_NUMBER, NULL);
if (basetype = (OID) strtoul(QR_get_value_backend_text(col_info->result, k, COLUMNS_BASE_TYPEID), NULL, 10), 0 == basetype)
basetype = (OID) strtoul(QR_get_value_backend_text(col_info->result, k, COLUMNS_FIELD_TYPE), NULL, 10);
atttypmod = QR_get_value_backend_int(col_info->result, k, COLUMNS_ATTTYPMOD, NULL);
MYLOG(DETAIL_LOG_LEVEL, "%d attnum=%d\n", k, attnum);
if (attnum == fi->attnum &&
basetype == fi->basetype &&
atttypmod == fi->typmod)
{
getColInfo(col_info, fi, k);
MYLOG(0, "PARSE: searchColInfo by attnum=%d\n", attnum);
return TRUE;
}
}
else if (NAME_IS_VALID(fi->column_name))
{
col = QR_get_value_backend_text(col_info->result, k, COLUMNS_COLUMN_NAME);
MYLOG(DETAIL_LOG_LEVEL, "%d col=%s\n", k, col);
if (fi->dquote)
cmp = strcmp(col, GET_NAME(fi->column_name));
else
cmp = stricmp(col, GET_NAME(fi->column_name));
if (!cmp)
{
if (!fi->dquote)
STR_TO_NAME(fi->column_name, col);
getColInfo(col_info, fi, k);
MYLOG(0, "PARSE: \n");
return TRUE;
}
}
}
return FALSE;
}
/*
* lower the unquoted name
*/
static
void lower_the_name(char *name, ConnectionClass *conn, BOOL dquote)
{
if (!dquote)
{
char *ptr;
encoded_str encstr;
make_encoded_str(&encstr, conn, name);
/* lower case table name */
for (ptr = name; *ptr; ptr++)
{
encoded_nextchar(&encstr);
if (!MBCS_NON_ASCII(encstr))
*ptr = tolower((UCHAR) *ptr);
}
}
}
/*
* Check relhasoids(before PG12), relhssubclass and get some relevant information.
*/
BOOL CheckPgClassInfo(StatementClass *stmt)
{
const COL_INFO *coli;
int table_info;
TABLE_INFO *ti;
BOOL hasoids = FALSE, hassubclass =FALSE, keyFound = FALSE;
MYLOG(0, "Entering\n");
if (0 != SC_checked_hasoids(stmt))
return TRUE;
if (!stmt->ti || !stmt->ti[0])
return FALSE;
ti = stmt->ti[0];
MYLOG(DETAIL_LOG_LEVEL, "ti->col_info=%p\n", ti->col_info);
if (TI_checked_hasoids(ti))
;
else if (coli = ti->col_info, NULL != coli)
{
table_info = coli->table_info;
if (0 == (table_info & TBINFO_HASSUBCLASS))
{
TI_set_has_no_subclass(ti);
}
else
{
hassubclass = TRUE;
TI_set_hassubclass(ti);
STR_TO_NAME(ti->bestitem, TABLEOID_NAME);
STRX_TO_NAME(ti->bestqual, "\"" TABLEOID_NAME "\" = %u");
}
if (!hassubclass)
{
if (0 == (table_info & TBINFO_HASOIDS))
{
TI_set_has_no_oids(ti);
}
else
{
hasoids = TRUE;
TI_set_hasoids(ti);
STR_TO_NAME(ti->bestitem, OID_NAME);
STRX_TO_NAME(ti->bestqual, "\"" OID_NAME "\" = %u");
}
}
ti->table_oid = coli->table_oid;
if (!hasoids && !hassubclass)
{
QResultClass *res = coli->result;
int num_tuples = res ? QR_get_num_cached_tuples(res) : -1;
if (num_tuples > 0)
{
int i;
for (i = 0; i < num_tuples; i++)
{
if (QR_get_value_backend_int(res, i, COLUMNS_AUTO_INCREMENT, NULL) != 0&&
QR_get_value_backend_int(res, i, COLUMNS_FIELD_TYPE, NULL) == PG_TYPE_INT4)
{
char query[512];
STR_TO_NAME(ti->bestitem, QR_get_value_backend_text(res, i, COLUMNS_COLUMN_NAME));
SPRINTF_FIXED(query, "\"%s\" = %%d", SAFE_NAME(ti->bestitem));
STRX_TO_NAME(ti->bestqual, query);
break;
}
}
}
}
TI_set_hasoids_checked(ti);
}
else
return FALSE;
stmt->num_key_fields = PG_NUM_NORMAL_KEYS;
if (TI_has_subclass(ti))
keyFound = FALSE;
else if (TI_has_oids(ti))
keyFound = TRUE;
else if (NAME_IS_NULL(ti->bestqual))
{
keyFound = TRUE;
stmt->num_key_fields--;
}
else
keyFound = TRUE;
MYLOG(DETAIL_LOG_LEVEL, "subclass=%d oids=%d bestqual=%s keyFound=%d num_key_fields=%d\n", TI_has_subclass(ti), TI_has_oids(ti), PRINT_NAME(ti->bestqual), keyFound, stmt->num_key_fields);
SC_set_checked_hasoids(stmt, keyFound);
return TRUE;
}
static BOOL increaseNtab(StatementClass *stmt, const char *func)
{
TABLE_INFO **ti = stmt->ti, *wti;
if (!(stmt->ntab % TAB_INCR))
{
SC_REALLOC_return_with_error(ti, TABLE_INFO *, (stmt->ntab + TAB_INCR) * sizeof(TABLE_INFO *), stmt, "PGAPI_AllocStmt failed in parse_statement for TABLE_INFO", FALSE);
stmt->ti = ti;
}
wti = ti[stmt->ntab] = (TABLE_INFO *) malloc(sizeof(TABLE_INFO));
if (wti == NULL)
{
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "PGAPI_AllocStmt failed in parse_statement for TABLE_INFO(2).", func);
return FALSE;
}
TI_Constructor(wti, SC_get_conn(stmt));
stmt->ntab++;
return TRUE;
}
static void setNumFields(IRDFields *irdflds, size_t numFields)
{
FIELD_INFO **fi = irdflds->fi;
size_t nfields = irdflds->nfields;
if (numFields < nfields)
{
int i;
for (i = (int) numFields; i < (int) nfields; i++)
{
if (fi[i])
fi[i]->flag = 0;
}
}
irdflds->nfields = (UInt4) numFields;
}
void SC_initialize_cols_info(StatementClass *stmt, BOOL DCdestroy, BOOL parseReset)
{
IRDFields *irdflds = SC_get_IRDF(stmt);
/* Free the parsed table information */
if (stmt->ti)
{
TI_Destructor(stmt->ti, stmt->ntab);
free(stmt->ti);
stmt->ti = NULL;
}
stmt->ntab = 0;
if (DCdestroy) /* Free the parsed field information */
DC_Destructor((DescriptorClass *) SC_get_IRD(stmt));
else
setNumFields(irdflds, 0);
if (parseReset)
{
stmt->parse_status = STMT_PARSE_NONE;
SC_reset_updatable(stmt);
}
}
static BOOL allocateFields(IRDFields *irdflds, size_t sizeRequested)
{
FIELD_INFO **fi = irdflds->fi;
size_t alloc_size, incr_size;
if (sizeRequested <= irdflds->allocated)
return TRUE;
alloc_size = (0 != irdflds->allocated ? irdflds->allocated : FLD_INCR);
for (; alloc_size < sizeRequested; alloc_size *= 2)
;
incr_size = sizeof(FIELD_INFO *) * (alloc_size - irdflds->allocated);
fi = (FIELD_INFO **) realloc(fi, alloc_size * sizeof(FIELD_INFO *));
if (!fi)
{
irdflds->fi = NULL;
irdflds->allocated = irdflds->nfields = 0;
return FALSE;
}
memset(&fi[irdflds->allocated], 0, incr_size);
irdflds->fi = fi;
irdflds->allocated = (SQLSMALLINT) alloc_size;
return TRUE;
}
/*
* This function may not be called but when it is called ...
*/
static void xxxxx(StatementClass *stmt, FIELD_INFO *fi, QResultClass *res, int i)
{
STR_TO_NAME(fi->column_alias, QR_get_fieldname(res, i));
fi->basetype = QR_get_field_type(res, i);
if (0 == fi->columntype)
fi->columntype = fi->basetype;
if (fi->attnum < 0)
{
fi->nullable = FALSE;
fi->updatable = FALSE;
}
else if (fi->attnum > 0)
{
int unknowns_as = 0;
int type = pg_true_type(SC_get_conn(stmt), fi->columntype, fi->basetype);
fi->nullable = TRUE; /* probably ? */
fi->column_size = pgtype_column_size(stmt, type, i, unknowns_as);
fi->length = pgtype_buffer_length(stmt, type, i, unknowns_as);
fi->decimal_digits = pgtype_decimal_digits(stmt, type, i);
fi->display_size = pgtype_display_size(stmt, type, i, unknowns_as);
}
if (NAME_IS_NULL(fi->column_name))
{
switch (fi->attnum)
{
case CTID_ATTNUM:
STR_TO_NAME(fi->column_name, "ctid");
break;
case OID_ATTNUM:
STR_TO_NAME(fi->column_name, OID_NAME);
break;
case XMIN_ATTNUM:
STR_TO_NAME(fi->column_name, XMIN_NAME);
break;
}
}
}
/*
* SQLColAttribute tries to set the FIELD_INFO (using protocol 3).
*/
static BOOL
ColAttSet(StatementClass *stmt, TABLE_INFO *rti)
{
CSTR func = "ColAttSet";
QResultClass *res = SC_get_ExecdOrParsed(stmt);
IRDFields *irdflds = SC_get_IRDF(stmt);
COL_INFO *col_info = NULL;
FIELD_INFO **fi, *wfi;
OID reloid = 0;
Int2 attid;
int i, num_fields;
BOOL fi_reuse, updatable, call_xxxxx;
MYLOG(0, "entering\n");
if (reloid = rti->table_oid, 0 == reloid)
return FALSE;
if (0 != (rti->flags & TI_COLATTRIBUTE))
return TRUE;
col_info = rti->col_info;
if (!QR_command_maybe_successful(res))
return FALSE;
if (num_fields = QR_NumPublicResultCols(res), num_fields <= 0)
return FALSE;
fi = irdflds->fi;
if (num_fields > (int) irdflds->allocated)
{
if (!allocateFields(irdflds, num_fields))
return FALSE;
fi = irdflds->fi;
}
setNumFields(irdflds, num_fields);
updatable = TI_is_updatable(rti);
MYLOG(0, "updatable=%d tab=%d fields=%d", updatable, stmt->ntab, num_fields);
if (updatable)
{
if (1 > stmt->ntab)
updatable = FALSE;
}
MYPRINTF(0, "->%d\n", updatable);
for (i = 0; i < num_fields; i++)
{
if (reloid == (OID) QR_get_relid(res, i))
{
if (wfi = fi[i], NULL == wfi)
{
wfi = (FIELD_INFO *) malloc(sizeof(FIELD_INFO));
if (wfi == NULL)
{
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "Couldn't allocate memory for field info.", func);
return FALSE;
}
fi_reuse = FALSE;
fi[i] = wfi;
}
else if (FI_is_applicable(wfi))
continue;
else
fi_reuse = TRUE;
FI_Constructor(wfi, fi_reuse);
attid = (Int2) QR_get_attid(res, i);
wfi->attnum = attid;
wfi->basetype = QR_get_field_type(res, i);
wfi->typmod = QR_get_atttypmod(res, i);
call_xxxxx = TRUE;
if (searchColInfo(col_info, wfi))
{
STR_TO_NAME(wfi->column_alias, QR_get_fieldname(res, i));
wfi->basetype = QR_get_field_type(res, i);
wfi->updatable = updatable;
call_xxxxx = FALSE;
}
else
{
if (attid > 0)
{
if (getColumnsInfo(NULL, rti, reloid, stmt) &&
searchColInfo(col_info, wfi))
{
STR_TO_NAME(wfi->column_alias, QR_get_fieldname(res, i));
wfi->basetype = QR_get_field_type(res, i);
wfi->updatable = updatable;
call_xxxxx= FALSE;
}
}
}
if (call_xxxxx)
xxxxx(stmt, wfi, res, i);
wfi->ti = rti;
wfi->flag |= FIELD_COL_ATTRIBUTE;
}
}
if (stmt->updatable < 0)
{
if (stmt->ntab > 1)
updatable = FALSE;
SC_set_updatable(stmt, updatable);
}
rti->flags |= TI_COLATTRIBUTE;
return TRUE;
}
static BOOL
getCOLIfromTable(ConnectionClass *conn, pgNAME *schema_name, pgNAME table_name, COL_INFO **coli)
{
int colidx;
BOOL found = FALSE;
*coli = NULL;
if (NAME_IS_NULL(table_name))
return TRUE;
if (NAME_IS_NULL(*schema_name))
{
const char *curschema = CC_get_current_schema(conn);
/*
* Though current_schema() doesn't have
* much sense in PostgreSQL, we first
* check the current_schema() when no
* explicit schema name is specified.
*/
if (curschema)
{
for (colidx = 0; colidx < conn->ntables; colidx++)
{
if (!NAMEICMP(conn->col_info[colidx]->table_name, table_name) &&
!stricmp(SAFE_NAME(conn->col_info[colidx]->schema_name), curschema))
{
MYLOG(0, "FOUND col_info table='%s' current schema='%s'\n", PRINT_NAME(table_name), curschema);
found = TRUE;
STR_TO_NAME(*schema_name, curschema);
break;
}
}
}
if (!found)
{
QResultClass *res;
char token[256], relcnv[128];
BOOL tblFound = FALSE;
/*
* We also have to check as follows.
*/
SPRINTF_FIXED(token,
"select nspname from pg_namespace n, pg_class c"
" where c.relnamespace=n.oid and c.oid='%s'::regclass",
identifierEscape((const SQLCHAR *) SAFE_NAME(table_name), SQL_NTS, conn, relcnv, sizeof(relcnv), TRUE));
res = CC_send_query(conn, token, NULL, READ_ONLY_QUERY, NULL);
if (QR_command_maybe_successful(res))
{
if (QR_get_num_total_tuples(res) == 1)
{
tblFound = TRUE;
STR_TO_NAME(*schema_name, QR_get_value_backend_text(res, 0, 0));
}
}
QR_Destructor(res);
if (!tblFound)
return FALSE;
}
}
if (!found && NAME_IS_VALID(*schema_name))
{
for (colidx = 0; colidx < conn->ntables; colidx++)
{
if (!NAMEICMP(conn->col_info[colidx]->table_name, table_name) &&
!NAMEICMP(conn->col_info[colidx]->schema_name, *schema_name))
{
MYLOG(0, "FOUND col_info table='%s' schema='%s'\n", PRINT_NAME(table_name), PRINT_NAME(*schema_name));
found = TRUE;
break;
}
}
}
*coli = found ? conn->col_info[colidx] : NULL;
return TRUE; /* success */
}
static BOOL
getColumnsInfo(ConnectionClass *conn, TABLE_INFO *wti, OID greloid, StatementClass *stmt)
{
BOOL found = FALSE;
RETCODE result;
HSTMT hcol_stmt = NULL;
StatementClass *col_stmt;
QResultClass *res;
MYLOG(0, "entering Getting PG_Columns for table %u(%s)\n", greloid, PRINT_NAME(wti->table_name));
if (NULL == conn)
conn = SC_get_conn(stmt);
result = PGAPI_AllocStmt(conn, &hcol_stmt, 0);
if (!SQL_SUCCEEDED(result))
{
if (stmt)
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "PGAPI_AllocStmt failed in parse_statement for columns.", __FUNCTION__);
goto cleanup;
}
col_stmt = (StatementClass *) hcol_stmt;
if (greloid)
result = PGAPI_Columns(hcol_stmt, NULL, 0,
NULL, 0, NULL, 0, NULL, 0,
PODBC_SEARCH_BY_IDS, greloid, 0);
else
result = PGAPI_Columns(hcol_stmt, NULL, 0,
(SQLCHAR *) SAFE_NAME(wti->schema_name), SQL_NTS,
(SQLCHAR *) SAFE_NAME(wti->table_name), SQL_NTS,
NULL, 0,
PODBC_NOT_SEARCH_PATTERN, 0, 0);
MYLOG(0, " Past PG_Columns\n");
res = SC_get_ExecdOrParsed(col_stmt);
if (SQL_SUCCEEDED(result)
&& res != NULL && QR_get_num_cached_tuples(res) > 0)
{
BOOL coli_exist = FALSE;
COL_INFO *coli = NULL, *ccoli = NULL, *tcoli;
int k;
time_t acctime = 0;
MYLOG(0, " Success\n");
if (greloid != 0)
{
/* We have reloid. Try to find appropriate coli object from connection COL_INFO cache. */
for (k = 0; k < conn->ntables; k++)
{
tcoli = conn->col_info[k];
if (tcoli->table_oid == greloid)
{
/* We found appropriate coli object, so we will use it. */
coli = tcoli;
coli_exist = TRUE;
break;
}
}
}
if (!coli_exist)
{
/* Not found, try to find unused coli or oldest (if overflow) in connection COL_INFO cache. */
for (k = 0; k < conn->ntables; k++)
{
tcoli = conn->col_info[k];
if (1 < tcoli->refcnt)
continue; /* This coli object is used somewhere else, skipping it. */
if ((0 == tcoli->table_oid &&
NAME_IS_NULL(tcoli->table_name)) ||
strnicmp(SAFE_NAME(tcoli->schema_name), "pg_temp_", 8) == 0)
{
/* Found unused coli object, taking it. */
coli = tcoli;
coli_exist = TRUE;
break;
}
if (NULL == ccoli || tcoli->acc_time < acctime)
{
/* Not yet found. Alongside, searching least recently used coli object. */
ccoli = tcoli;
acctime = tcoli->acc_time;
}
}
if (!coli_exist && NULL != ccoli && conn->ntables >= COLI_RECYCLE)
{
/* Not found unsed object. Amount of them is on limit. Taking least recently used coli object. */
coli_exist = TRUE;
coli = ccoli;
}
}
if (coli_exist)
{
/* We have ready to use coli object. Cleaning it. */
free_col_info_contents(coli);
}
else
{
/* We have no coli object. Must create a new one. */
if (conn->ntables >= conn->coli_allocated)
{
/* No place in connection COL_INFO cache table. Allocating or reallocating. */
Int2 new_alloc;
COL_INFO **col_info;
new_alloc = conn->coli_allocated * 2;
if (new_alloc <= conn->ntables)
new_alloc = COLI_INCR;
MYLOG(0, "PARSE: Allocating col_info at ntables=%d\n", conn->ntables);
col_info = (COL_INFO **) realloc(conn->col_info, new_alloc * sizeof(COL_INFO *));
if (!col_info)
{
if (stmt)
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "PGAPI_AllocStmt failed in parse_statement for col_info.", __FUNCTION__);
goto cleanup;
}
conn->col_info = col_info;
conn->coli_allocated = new_alloc;
}
/* Allocating new COL_INFO object. */
MYLOG(0, "PARSE: malloc at conn->col_info[%d]\n", conn->ntables);
coli = conn->col_info[conn->ntables] = (COL_INFO *) malloc(sizeof(COL_INFO));
}
if (!coli)
{
if (stmt)
SC_set_error(stmt, STMT_NO_MEMORY_ERROR, "PGAPI_AllocStmt failed in parse_statement for col_info(2).", __FUNCTION__);
goto cleanup;
}
col_info_initialize(coli);
coli->refcnt++; /* Counting one reference to coli object from connection COL_INFO cache table. */
coli->result = res;
if (res && QR_get_num_cached_tuples(res) > 0)
{
int num_tuples = QR_get_num_cached_tuples(res);
int i;
if (!greloid)
greloid = (OID) strtoul(QR_get_value_backend_text(res, 0, COLUMNS_TABLE_OID), NULL, 10);
if (!wti->table_oid)
wti->table_oid = greloid;
if (NAME_IS_NULL(wti->schema_name))
STR_TO_NAME(wti->schema_name,
QR_get_value_backend_text(res, 0, COLUMNS_SCHEMA_NAME));
if (NAME_IS_NULL(wti->table_name))
STR_TO_NAME(wti->table_name,
QR_get_value_backend_text(res, 0, COLUMNS_TABLE_NAME));
for (i = 0; i < num_tuples; i++)
{
if (NULL != QR_get_value_backend_text(res, 0, COLUMNS_TABLE_INFO))
{
coli->table_info = QR_get_value_backend_int(res, 0, COLUMNS_TABLE_INFO, NULL);
break;
}
}
}
MYLOG(DETAIL_LOG_LEVEL, "#2 %p->table_name=%s(%u)\n", wti, PRINT_NAME(wti->table_name), wti->table_oid);
/*
* Store the table name and the SQLColumns result
* structure
*/
if (NAME_IS_VALID(wti->schema_name))
{
NAME_TO_NAME(coli->schema_name, wti->schema_name);
}
else
NULL_THE_NAME(coli->schema_name);
NAME_TO_NAME(coli->table_name, wti->table_name);
coli->table_oid = wti->table_oid;
/*
* The connection will now free the result structures, so
* make sure that the statement doesn't free it
*/
SC_init_Result(col_stmt);
if (!coli_exist)
conn->ntables++;
if (res && QR_get_num_cached_tuples(res) > 0)
MYLOG(DETAIL_LOG_LEVEL, "oid item == %s\n", (const char *) QR_get_value_backend_text(res, 0, 3));
MYLOG(0, "Created col_info table='%s', ntables=%d\n", PRINT_NAME(wti->table_name), conn->ntables);
/* Associate a table from the statement with a SQLColumn info */
found = TRUE;
coli->refcnt++; /* Counting another one reference to coli object from TABLE_INFO wti object. */
wti->col_info = coli;
}
cleanup:
if (hcol_stmt)
PGAPI_FreeStmt(hcol_stmt, SQL_DROP);
return found;
}
BOOL getCOLIfromTI(const char *func, ConnectionClass *conn, StatementClass *stmt, const OID reloid, TABLE_INFO **pti)
{
BOOL colatt = FALSE, found = FALSE;
OID greloid = reloid;
TABLE_INFO *wti = *pti;
COL_INFO *coli;
MYLOG(DETAIL_LOG_LEVEL, "entering reloid=%u ti=%p\n", reloid, wti);
if (!conn)
conn = SC_get_conn(stmt);
if (!wti) /* SQLColAttribute case */
{
int i;