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oracle_utils.c
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oracle_utils.c
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/*-------------------------------------------------------------------------
*
* oracle_utils.c
* routines that use OCI (Oracle's C API)
*
*-------------------------------------------------------------------------
*/
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#if defined _WIN32 || defined _WIN64
/* for getpid */
#include <process.h>
#endif
/* Oracle header */
#include <oci.h>
#include "oracle_fdw.h"
/* number of rows and memory limit for prefetch */
#define PREFETCH_ROWS 200
#define PREFETCH_MEMORY 24576
/* number of bytes to read per LOB chunk */
#define LOB_CHUNK_SIZE 8132
/* emit no error messages when set, used for shutdown */
static int silent = 0;
/* contains Oracle error messages, set by checkerr() */
#define ERRBUFSIZE 1000
static char oraMessage[ERRBUFSIZE];
static sb4 err_code;
/* set to "1" as soon as OCIEnvCreate is called */
static int oci_initialized = 0;
/*
* Linked list for temporary Oracle handles and descriptors.
* Stores statement and describe handles as well as timetamp and LOB descriptors.
* Other handles are stored in the handle cache below.
*/
struct handleEntry
{
dvoid *handlep;
ub4 type;
int isDescriptor;
struct handleEntry *next;
};
/*
* Linked list for connection, server and environment handles.
* "envlist" is the starting point.
* Oracle sessions can be multiplexed over one server connection.
*/
struct connEntry
{
char *user;
OCISvcCtx *svchp;
OCISession *userhp;
struct handleEntry *handlelist;
int xact_level; /* 0 = none, 1 = main, else subtransaction */
struct connEntry *next;
};
struct srvEntry
{
char *connectstring;
OCIServer *srvhp;
struct srvEntry *next;
struct connEntry *connlist;
};
static struct envEntry
{
char *nls_lang;
OCIEnv *envhp;
OCIError *errhp;
struct envEntry *next;
struct srvEntry *srvlist;
} *envlist = NULL;
/*
* Represents one Oracle connection, points to cached entries.
* This is necessary to be able to pass them back to
* oracle_fdw.c without having to #include oci.h there.
*/
struct oracleSession
{
struct envEntry *envp;
struct srvEntry *srvp;
struct connEntry *connp;
OCIStmt *stmthp;
};
/*
* Helper functions
*/
static void oracleSetSavepoint(oracleSession *session, int nest_level);
static void setOracleEnvironment(char *nls_lang);
static void oracleQueryPlan(oracleSession *session, const char *query, const char *desc_query, int nres, dvoid **res, sb4 *res_size, ub2 *res_type, ub2 *res_len, sb2 *res_ind);
static sword checkerr(sword status, dvoid *handle, ub4 handleType);
static char *copyOraText(const char *string, int size, int quote);
static void closeSession(OCIEnv *envhp, OCIServer *srvhp, OCISession *userhp, int disconnect);
static void disconnectServer(OCIEnv *envhp, OCIServer *srvhp);
static void removeEnvironment(OCIEnv *envhp);
static void allocHandle(dvoid **handlep, ub4 type, int isDescriptor, OCIEnv *envhp, struct connEntry *connp, oraError error, const char *errmsg);
static void freeHandle(dvoid *handlep, struct connEntry *connp);
static ub2 getOraType(oraType arg);
static sb4 bind_out_callback(void *octxp, OCIBind *bindp, ub4 iter, ub4 index, void **bufpp, ub4 **alenp, ub1 *piecep, void **indp, ub2 **rcodep);
static sb4 bind_in_callback(void *ictxp, OCIBind *bindp, ub4 iter, ub4 index, void **bufpp, ub4 *alenp, ub1 *piecep, void **indpp);
static void oracleWriteLob(oracleSession *session, OCILobLocator *locptr, char *value);
/*
* oracleGetSession
* Look up an Oracle connection in the cache, create a new one if there is none.
* The result is a palloc'ed data structure containing the connection.
* "curlevel" is the current PostgreSQL transaction level.
*/
oracleSession
*oracleGetSession(const char *connectstring, char *user, char *password, const char *nls_lang, const char *tablename, int curlevel)
{
OCIEnv *envhp = NULL;
OCIError *errhp = NULL;
OCISvcCtx *svchp = NULL;
OCIServer *srvhp = NULL;
OCISession *userhp = NULL;
OCITrans *txnhp = NULL;
oracleSession *session;
struct envEntry *envp;
struct srvEntry *srvp;
struct connEntry *connp;
char pid[30], *nlscopy = NULL;
ub4 is_connected;
/* it's easier to deal with empty strings */
if (!connectstring)
connectstring = "";
if (!user)
user = "";
if (!password)
password = "";
if (!nls_lang)
nls_lang = "";
/* search environment and server handle in cache */
for (envp = envlist; envp != NULL; envp = envp->next)
{
if (strcmp(envp->nls_lang, nls_lang) == 0)
{
envhp = envp->envhp;
errhp = envp->errhp;
break;
}
}
if (envhp == NULL)
{
/*
* Create environment and error handle.
*/
/* create persistent copy of "nls_lang" */
if ((nlscopy = strdup(nls_lang)) == NULL)
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
strlen(nls_lang) + 1);
/* set Oracle environment */
setOracleEnvironment(nlscopy);
/* create environment handle */
if (checkerr(
OCIEnvCreate((OCIEnv **) &envhp, (ub4) OCI_DEFAULT,
(dvoid *) 0, (dvoid * (*)(dvoid *,size_t)) 0,
(dvoid * (*)(dvoid *, dvoid *, size_t)) 0,
(void (*)(dvoid *, dvoid *)) 0, (size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != 0)
{
free(nlscopy);
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIEnvCreate failed to create environment handle",
oraMessage);
}
/* we can call OCITerminate now */
oci_initialized = 1;
/* allocate error handle */
if (checkerr(
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &errhp,
(ub4) OCI_HTYPE_ERROR,
(size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != OCI_SUCCESS)
{
free(nlscopy);
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIHandleAlloc failed to allocate error handle",
oraMessage);
}
/* add handles to cache */
if ((envp = malloc(sizeof(struct envEntry))) == NULL)
{
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
sizeof(struct envEntry));
}
envp->nls_lang = nlscopy;
envp->envhp = envhp;
envp->errhp = errhp;
envp->srvlist = NULL;
envp->next = envlist;
envlist = envp;
}
/* search connect string in cache */
for (srvp = envp->srvlist; srvp != NULL; srvp = srvp->next)
{
if (strcmp(srvp->connectstring, connectstring) == 0)
{
srvhp = srvp->srvhp;
break;
}
}
if (srvp != NULL)
{
/*
* Test if we are still connected.
* If not, clean up the mess.
*/
if (checkerr(
OCIAttrGet((dvoid *)srvhp, (ub4)OCI_HTYPE_SERVER,
(dvoid *)&is_connected, (ub4 *)0, (ub4)OCI_ATTR_SERVER_STATUS, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error connecting to Oracle: OCIAttrGet failed to get connection status",
oraMessage);
}
if (is_connected == OCI_SERVER_NOT_CONNECTED)
{
/* clean up */
silent = 1;
while (srvp->connlist != NULL)
{
closeSession(envhp, srvhp, srvp->connlist->userhp, 0);
}
disconnectServer(envhp, srvhp);
silent = 0;
srvp = NULL;
}
}
if (srvp == NULL)
{
/*
* No cache entry was found, we have to create a new server connection.
*/
/* create new server handle */
if (checkerr(
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &srvhp,
(ub4) OCI_HTYPE_SERVER,
(size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIHandleAlloc failed to allocate server handle",
oraMessage);
}
/* connect to the Oracle server */
if (checkerr(
OCIServerAttach(srvhp, errhp, (text *)connectstring, strlen(connectstring), 0),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
if (tablename)
oracleError_sd(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"connection for foreign table \"%s\" cannot be established", tablename,
oraMessage);
else
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"cannot connect to foreign Oracle server",
oraMessage);
}
/* add server handle to cache */
if ((srvp = malloc(sizeof(struct srvEntry))) == NULL)
{
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
sizeof(struct srvEntry));
}
if ((srvp->connectstring = strdup(connectstring)) == NULL)
{
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
strlen(connectstring) + 1);
}
srvp->srvhp = srvhp;
srvp->next = envp->srvlist;
srvp->connlist = NULL;
envp->srvlist = srvp;
}
/* search user session for this server in cache */
for (connp = srvp->connlist; connp != NULL; connp = connp->next)
{
if (strcmp(connp->user, user) == 0)
{
svchp = connp->svchp;
userhp = connp->userhp;
break;
}
}
if (userhp == NULL)
{
/*
* If no cached user session was found, authenticate.
*/
/* allocate service handle */
if (checkerr(
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &svchp,
(ub4) OCI_HTYPE_SVCCTX,
(size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != OCI_SUCCESS)
{
free(nlscopy);
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIHandleAlloc failed to allocate service handle",
oraMessage);
}
/* set server handle in service handle */
if (checkerr(
OCIAttrSet(svchp, OCI_HTYPE_SVCCTX, srvhp, 0,
OCI_ATTR_SERVER, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set server handle in service handle",
oraMessage);
}
/* create transaction handle */
if (checkerr(
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &txnhp,
(ub4) OCI_HTYPE_TRANS,
(size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIHandleAlloc failed to allocate transaction handle",
oraMessage);
}
/* set transaction handle in service handle */
if (checkerr(
OCIAttrSet(svchp, OCI_HTYPE_SVCCTX, txnhp, 0,
OCI_ATTR_TRANS, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set transaction handle in service handle",
oraMessage);
}
/* create session handle */
if (checkerr(
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &userhp,
(ub4) OCI_HTYPE_SESSION,
(size_t) 0, (dvoid **) 0),
(dvoid *)envhp, OCI_HTYPE_ENV) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIHandleAlloc failed to allocate session handle",
oraMessage);
}
/* set MODULE for the Oracle session */
sprintf(pid, "%lu", (unsigned long)getpid());
pid[29] = '\0';
if (checkerr(
OCIAttrSet(userhp, OCI_HTYPE_SESSION, "postgres", (ub4)8,
OCI_ATTR_MODULE, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set module in session handle",
oraMessage);
}
/* set ACTION for the Oracle session */
if (checkerr(
OCIAttrSet(userhp, OCI_HTYPE_SESSION, pid, (ub4)strlen(pid),
OCI_ATTR_ACTION, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set action in session handle",
oraMessage);
}
/* set user name */
if (checkerr(
OCIAttrSet(userhp, OCI_HTYPE_SESSION, user, strlen(user),
OCI_ATTR_USERNAME, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set user name in session handle",
oraMessage);
}
/* set password */
if (checkerr(
OCIAttrSet(userhp, OCI_HTYPE_SESSION, password, strlen(password),
OCI_ATTR_PASSWORD, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set password in session handle",
oraMessage);
}
/* authenticate; use external authentication if no username has been supplied */
if (checkerr(
OCISessionBegin(svchp, errhp, userhp,
(user[0] == '\0' ? OCI_CRED_EXT : OCI_CRED_RDBMS), OCI_DEFAULT),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_sd(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"session for foreign table \"%s\" cannot be authenticated", tablename,
oraMessage);
}
/* set session handle in service handle */
if (checkerr(
OCIAttrSet(svchp, OCI_HTYPE_SVCCTX, userhp, 0,
OCI_ATTR_SESSION, errhp),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCIAttrSet failed to set session handle in service handle",
oraMessage);
}
/* add session handle to cache */
if ((connp = malloc(sizeof(struct connEntry))) == NULL)
{
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
sizeof(struct connEntry));
}
if ((connp->user = strdup(user)) == NULL)
{
oracleError_i(FDW_OUT_OF_MEMORY,
"error connecting to Oracle: failed to allocate %d bytes of memory",
sizeof(strlen(user) + 1));
}
connp->svchp = svchp;
connp->userhp = userhp;
connp->handlelist = NULL;
connp->xact_level = 0;
connp->next = srvp->connlist;
srvp->connlist = connp;
/* register callback for PostgreSQL transaction events */
oracleRegisterCallback(connp);
}
if (connp->xact_level <= 0)
{
oracleDebug2("oracle_fdw: begin serializable remote transaction");
/* start a read-only or "serializable" (= repeatable read) transaction */
if (checkerr(
OCITransStart(svchp, errhp, (uword)0, OCI_TRANS_SERIALIZABLE),
(dvoid *)errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_ESTABLISH_CONNECTION,
"error connecting to Oracle: OCITransStart failed to start a transaction",
oraMessage);
}
connp->xact_level = 1;
}
/* palloc a data structure pointing to the cached entries */
session = oracleAlloc(sizeof(struct oracleSession));
session->envp = envp;
session->srvp = srvp;
session->connp = connp;
session->stmthp = NULL;
/* set savepoints up to the current level */
oracleSetSavepoint(session, curlevel);
return session;
}
/*
* oracleCloseStatement
* Close any open statement associated with the session.
*/
void
oracleCloseStatement(oracleSession *session)
{
/* free statement handle, if it exists */
if (session->stmthp != NULL)
{
/* free the statement handle */
freeHandle(session->stmthp, session->connp);
session->stmthp = NULL;
}
}
/*
* oracleCloseConnections
* Close everything in the cache.
*/
void
oracleCloseConnections(void)
{
while (envlist != NULL)
{
while (envlist->srvlist != NULL)
{
while (envlist->srvlist->connlist != NULL)
{
closeSession(envlist->envhp, envlist->srvlist->srvhp, envlist->srvlist->connlist->userhp, 0);
}
disconnectServer(envlist->envhp, envlist->srvlist->srvhp);
}
removeEnvironment(envlist->envhp);
}
}
/*
* oracleShutdown
* Close all open connections, free handles, terminate Oracle.
* This will be called at the end of the PostgreSQL session.
*/
void
oracleShutdown(void)
{
/* don't report error messages */
silent = 1;
oracleCloseConnections();
/* done with Oracle */
if (oci_initialized)
(void)OCITerminate(OCI_DEFAULT);
}
/*
* oracleEndTransaction
* Commit or rollback the transaction.
* The first argument must be a connEntry.
* If "noerror" is true, don't throw errors.
*/
void oracleEndTransaction(void *arg, int is_commit, int noerror)
{
struct connEntry *connp = NULL;
struct srvEntry *srvp = NULL;
struct envEntry *envp = NULL;
int found = 0;
/* do nothing if there is no transaction */
if (((struct connEntry *)arg)->xact_level == 0)
return;
/* find the cached handles for the argument */
envp = envlist;
while (envp)
{
srvp = envp->srvlist;
while (srvp)
{
connp = srvp->connlist;
while (connp)
{
if (connp == (struct connEntry *)arg)
{
found = 1;
break;
}
connp = connp->next;
}
if (found)
break;
srvp = srvp->next;
}
if (found)
break;
envp = envp->next;
}
if (! found)
oracleError(FDW_ERROR, "oracleEndTransaction internal error: handle not found in cache");
/* free handles */
while (connp->handlelist != NULL)
freeHandle(connp->handlelist->handlep, connp);
/* commit or rollback */
if (is_commit)
{
oracleDebug2("oracle_fdw: commit remote transaction");
if (checkerr(
OCITransCommit(connp->svchp, envp->errhp, OCI_DEFAULT),
(dvoid *)envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS && !noerror)
{
oracleError_d(FDW_UNABLE_TO_CREATE_EXECUTION,
"error committing transaction: OCITransCommit failed",
oraMessage);
}
}
else
{
oracleDebug2("oracle_fdw: roll back remote transaction");
if (checkerr(
OCITransRollback(connp->svchp, envp->errhp, OCI_DEFAULT),
(dvoid *)envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS && !noerror)
{
oracleError_d(FDW_UNABLE_TO_CREATE_EXECUTION,
"error rolling back transaction: OCITransRollback failed",
oraMessage);
}
}
connp->xact_level = 0;
}
/*
* oracleEndSubtransaction
* Commit or rollback all subtransaction up to savepoint "nest_nevel".
* The first argument must be a connEntry.
* If "is_commit" is not true, rollback.
*/
void
oracleEndSubtransaction(void *arg, int nest_level, int is_commit)
{
char query[50], message[60];
struct connEntry *connp = NULL;
struct srvEntry *srvp = NULL;
struct envEntry *envp = NULL;
OCIStmt *stmthp = NULL;
int found = 0;
/* do nothing if the transaction level is lower than nest_level */
if (((struct connEntry *)arg)->xact_level < nest_level)
return;
((struct connEntry *)arg)->xact_level = nest_level - 1;
if (is_commit)
{
/*
* There is nothing to do as savepoints don't get released in Oracle:
* Setting the same savepoint again just overwrites the previous one.
*/
return;
}
/* find the cached handles for the argument */
envp = envlist;
while (envp)
{
srvp = envp->srvlist;
while (srvp)
{
connp = srvp->connlist;
while (connp)
{
if (connp == (struct connEntry *)arg)
{
found = 1;
break;
}
connp = connp->next;
}
if (found)
break;
srvp = srvp->next;
}
if (found)
break;
envp = envp->next;
}
if (! found)
oracleError(FDW_ERROR, "oracleRollbackSavepoint internal error: handle not found in cache");
snprintf(message, 59, "oracle_fdw: rollback to savepoint s%d", nest_level);
oracleDebug2(message);
snprintf(query, 49, "ROLLBACK TO SAVEPOINT s%d", nest_level);
/* create statement handle */
allocHandle((void **)&stmthp, OCI_HTYPE_STMT, 0, envp->envhp, connp,
FDW_OUT_OF_MEMORY,
"error rolling back to savepoint: OCIHandleAlloc failed to allocate statement handle");
/* prepare the query */
if (checkerr(
OCIStmtPrepare(stmthp, envp->errhp, (text *)query, (ub4) strlen(query),
(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT),
(dvoid *)envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_EXECUTION,
"error rolling back to savepoint: OCIStmtPrepare failed to prepare rollback statement",
oraMessage);
}
/* rollback to savepoint */
if (checkerr(
OCIStmtExecute(connp->svchp, stmthp, envp->errhp, (ub4)1, (ub4)0,
(CONST OCISnapshot *)NULL, (OCISnapshot *)NULL, OCI_DEFAULT),
(dvoid *)envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_EXECUTION,
"error rolling back to savepoint: OCIStmtExecute failed to set savepoint",
oraMessage);
}
/* free statement handle */
freeHandle(stmthp, connp);
}
/*
* oracleIsStatementOpen
* Return 1 if there is a statement handle, else 0.
*/
int
oracleIsStatementOpen(oracleSession *session)
{
return (session->stmthp != NULL);
}
/*
* oracleDescribe
* Find the remote Oracle table and describe it.
* Returns a palloc'ed data structure with the results.
*/
struct oraTable
*oracleDescribe(oracleSession *session, char *schema, char *table, char *pgname, long max_long)
{
struct oraTable *reply;
OCIStmt *stmthp;
OCIParam *colp;
ub2 oraType, charsize, bin_size;
ub1 csfrm;
sb2 precision;
sb1 scale;
char *qtable, *qschema = NULL, *tablename, *query;
OraText *ident;
ub4 ncols, ident_size;
int i, length;
/* get a complete quoted table name */
qtable = copyOraText(table, strlen(table), 1);
length = strlen(qtable);
if (schema != NULL)
{
qschema = copyOraText(schema, strlen(schema), 1);
length += strlen(qschema) + 1;
}
tablename = oracleAlloc(length + 1);
tablename[0] = '\0'; /* empty */
if (schema != NULL)
{
strcat(tablename, qschema);
strcat(tablename, ".");
}
strcat(tablename, qtable);
oracleFree(qtable);
if (schema != NULL)
oracleFree(qschema);
/* construct a "SELECT * FROM ..." query to describe columns */
length += 14;
query = oracleAlloc(length + 1);
strcpy(query, "SELECT * FROM ");
strcat(query, tablename);
/* create statement handle */
allocHandle((void **)&stmthp, OCI_HTYPE_STMT, 0, session->envp->envhp, session->connp,
FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIHandleAlloc failed to allocate statement handle");
/* prepare the query */
if (checkerr(
OCIStmtPrepare(stmthp, session->envp->errhp, (text *)query, (ub4) strlen(query),
(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIStmtPrepare failed to prepare query",
oraMessage);
}
if (checkerr(
OCIStmtExecute(session->connp->svchp, stmthp, session->envp->errhp, (ub4)0, (ub4)0,
(CONST OCISnapshot *)NULL, (OCISnapshot *)NULL, OCI_DESCRIBE_ONLY),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
if (err_code == 942)
oracleError_ssdh(FDW_TABLE_NOT_FOUND,
"Oracle table %s for foreign table \"%s\" does not exist or does not allow read access", tablename, pgname,
oraMessage, "Oracle table names are case sensitive (normally all uppercase).");
else
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIStmtExecute failed to describe table",
oraMessage);
}
/* allocate an oraTable struct for the results */
reply = oracleAlloc(sizeof(struct oraTable));
reply->name = tablename;
reply->pgname = pgname;
reply->npgcols = 0;
/* get the number of columns */
if (checkerr(
OCIAttrGet((dvoid *)stmthp, (ub4)OCI_HTYPE_STMT,
(dvoid *)&ncols, (ub4 *)0, (ub4)OCI_ATTR_PARAM_COUNT, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get number of columns",
oraMessage);
}
reply->ncols = ncols;
reply->cols = (struct oraColumn **)oracleAlloc(sizeof(struct oraColumn *) * reply->ncols);
/* loop through the column list */
for (i=1; i<=reply->ncols; ++i)
{
/* allocate an oraColumn struct for the column */
reply->cols[i-1] = (struct oraColumn *)oracleAlloc(sizeof(struct oraColumn));
reply->cols[i-1]->pgname = NULL;
reply->cols[i-1]->pgattnum = 0;
reply->cols[i-1]->pgtype = 0;
reply->cols[i-1]->pgtypmod = 0;
reply->cols[i-1]->used = 0;
reply->cols[i-1]->pkey = 0;
reply->cols[i-1]->val = NULL;
reply->cols[i-1]->val_len = 0;
reply->cols[i-1]->val_null = 1;
/* get the parameter descriptor for the column */
if (checkerr(
OCIParamGet((void *)stmthp, OCI_HTYPE_STMT, session->envp->errhp, (dvoid **)&colp, i),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIParamGet failed to get column data",
oraMessage);
}
/* get the column name */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&ident,
&ident_size, (ub4)OCI_ATTR_NAME, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column name",
oraMessage);
}
reply->cols[i-1]->name = copyOraText((char *)ident, (int)ident_size, 1);
/* get the data type */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&oraType,
(ub4 *)0, (ub4)OCI_ATTR_DATA_TYPE, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column type",
oraMessage);
}
/* get the character set form */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&csfrm,
(ub4 *)0, (ub4)OCI_ATTR_CHARSET_FORM, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get character set form",
oraMessage);
}
/* get the number of characters for string fields */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&charsize,
(ub4 *)0, (ub4)OCI_ATTR_CHAR_SIZE, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column length",
oraMessage);
}
/* get the binary length for RAW fields */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&bin_size,
(ub4 *)0, (ub4)OCI_ATTR_DATA_SIZE, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column size",
oraMessage);
}
/* get the precision */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&precision,
(ub4 *)0, (ub4)OCI_ATTR_PRECISION, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column precision",
oraMessage);
}
/* get the scale */
if (checkerr(
OCIAttrGet((dvoid*)colp, OCI_DTYPE_PARAM, (dvoid*)&scale,
(ub4 *)0, (ub4)OCI_ATTR_SCALE, session->envp->errhp),
(dvoid *)session->envp->errhp, OCI_HTYPE_ERROR) != OCI_SUCCESS)
{
oracleError_d(FDW_UNABLE_TO_CREATE_REPLY,
"error describing remote table: OCIAttrGet failed to get column scale",
oraMessage);
}
reply->cols[i-1]->scale = scale;
/* determine oraType and length to allocate */
switch (oraType)
{
case SQLT_AFC:
/* CHAR(n) */
reply->cols[i-1]->oratype = ORA_TYPE_CHAR;
reply->cols[i-1]->val_size = charsize * 4 + 1;
break;
case SQLT_CHR:
case SQLT_VCS:
/* VARCHAR(n) and VARCHAR2(n) */
reply->cols[i-1]->oratype = ORA_TYPE_VARCHAR2;
reply->cols[i-1]->val_size = charsize * 4 + 1;
break;
case SQLT_BLOB:
/* BLOB */
reply->cols[i-1]->oratype = ORA_TYPE_BLOB;
/* for LOB columns, "val" will contain a pointer to the locator */
reply->cols[i-1]->val_size = sizeof(OCILobLocator *);
break;
case SQLT_BFILE:
/* BFILE */
reply->cols[i-1]->oratype = ORA_TYPE_BFILE;
/* for LOB columns, "val" will contain a pointer to the locator */
reply->cols[i-1]->val_size = sizeof(OCILobLocator *);
break;
case SQLT_CLOB:
case SQLT_CFILE:
/* CLOB and CFILE */
if (csfrm == SQLCS_NCHAR)
{
/*
* We don't support NCLOB because Oracle cannot
* transform it to the client character set automatically.
*/
reply->cols[i-1]->oratype = ORA_TYPE_OTHER;
reply->cols[i-1]->val_size = 0;
}
else
{