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jq.c
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/*
* --------------------------------------------- jq.c Implementation of Low
* level JDBC based functions replacing the libpq-fe functions
*
* Heimir Sverrisson, 2015-04-13
*
* Portions Copyright (c) 2021, TOSHIBA CORPORATION
*
* ---------------------------------------------
*/
#include <stdlib.h>
#include "postgres.h"
#include "jdbc_fdw.h"
#include "catalog/pg_foreign_server.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_user_mapping.h"
#include "catalog/pg_type.h"
#include "storage/ipc.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
#include "utils/guc.h"
#include "utils/syscache.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "foreign/fdwapi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "commands/defrem.h"
#include "libpq-fe.h"
#include "jni.h"
#define Str(arg) #arg
#define StrValue(arg) Str(arg)
#define STR_SHAREEXTDIR StrValue(SHARE_EXT_DIR)
/* Number of days from unix epoch time (1970-01-01) to postgres epoch time (2000-01-01) */
#define POSTGRES_TO_UNIX_EPOCH_DAYS (POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE)
/* POSTGRES_TO_UNIX_EPOCH_DAYS to microseconds */
#define POSTGRES_TO_UNIX_EPOCH_USECS (POSTGRES_TO_UNIX_EPOCH_DAYS * USECS_PER_DAY)
#ifdef _WIN32
#define PATH_SEPARATOR ";"
#else
#define PATH_SEPARATOR ":"
#endif
/*
* Local housekeeping functions and Java objects
*/
static __thread JNIEnv * Jenv = NULL;
static JavaVM * jvm = NULL;
/*
* Describes the valid options for objects that use this wrapper.
*/
struct jdbcFdwOption
{
const char *optname;
Oid optcontext; /* Oid of catalog in which option may appear */
};
/*
* Structure holding options from the foreign server and user mapping
* definitions
*/
typedef struct JserverOptions
{
char *url;
char *drivername;
char *username;
char *password;
int querytimeout;
char *jarfile;
int maxheapsize;
} JserverOptions;
static JserverOptions opts;
/* Local function prototypes */
static int jdbc_connect_db_complete(JDBCUtilsInfo * jdbcUtilsInfo);
void jdbc_jvm_init(const ForeignServer *server, const UserMapping *user);
static void jdbc_get_server_options(JserverOptions * opts, const ForeignServer *f_server, const UserMapping *f_mapping);
static JDBCUtilsInfo * jdbc_create_JDBC_connection(const ForeignServer *server, const UserMapping *user);
/*
* Uses a String object's content to create an instance of C String
*/
static char *jdbc_convert_string_to_cstring(jobject);
/*
* Convert byte array to Datum
*/
static Datum jdbc_convert_byte_array_to_datum(jbyteArray);
/*
* Common function to convert Object value to datum
*/
static Datum jdbc_convert_object_to_datum(Oid, int32, jobject);
/*
* JVM destroy function
*/
static void jdbc_destroy_jvm();
/*
* JVM attach function
*/
static void jdbc_attach_jvm(void);
/*
* JVM detach function
*/
static void jdbc_detach_jvm();
/*
* clears any exception that is currently being thrown
*/
void jq_exception_clear(void);
/*
* check for pending exceptions
*/
void jq_get_exception(void);
/*
* get table infomations for importForeignSchema
*/
static List *jq_get_column_infos(JDBCUtilsInfo * jdbcUtilsInfo, char *tablename);
static List *jq_get_table_names(JDBCUtilsInfo * jdbcUtilsInfo);
static void jq_get_JDBCUtils(JDBCUtilsInfo * jdbcUtilsInfo, jclass * JDBCUtilsClass, jobject * JDBCUtilsObject);
/* jq_cancel
* Call cancel method from JDBCUtilsObject to release
* prepared statement and temporary result-set.
*/
void
jq_cancel(JDBCUtilsInfo * jdbcUtilsInfo)
{
jclass JDBCUtilsClass;
jmethodID id_cancel;
MemoryContext ccxt = CurrentMemoryContext;
/* JDBCUtils object has been cleaned, do nothing */
if (jvm == NULL || Jenv == NULL)
return;
PG_TRY();
{
JDBCUtilsClass = (*Jenv)->FindClass(Jenv, "JDBCUtils");
if (JDBCUtilsClass == NULL)
{
elog(ERROR, "JDBCUtilsClass is NULL");
}
id_cancel = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "cancel",
"()V");
if (id_cancel == NULL)
{
elog(ERROR, "id_cancel is NULL");
}
jq_exception_clear();
(*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, id_cancel);
jq_get_exception();
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(ccxt);
edata = CopyErrorData();
FlushErrorState();
/*
* We are in Transaction abort callback, raise error here may making
* the infinity loop.
*/
elog(WARNING, "jq_cancel failed: %s", edata->message);
}
PG_END_TRY();
}
/*
* jdbc_convert_string_to_cstring Uses a String object passed as a jobject to
* the function to create an instance of C String.
*/
static char *
jdbc_convert_string_to_cstring(jobject java_cstring)
{
jclass JavaString;
char *StringPointer;
char *cString = NULL;
JavaString = (*Jenv)->FindClass(Jenv, "java/lang/String");
if (!((*Jenv)->IsInstanceOf(Jenv, java_cstring, JavaString)))
{
elog(ERROR, "Object not an instance of String class");
}
if (java_cstring != NULL)
{
StringPointer = (char *) (*Jenv)->GetStringUTFChars(Jenv,
(jstring) java_cstring, 0);
cString = pstrdup(StringPointer);
(*Jenv)->ReleaseStringUTFChars(Jenv, (jstring) java_cstring, StringPointer);
(*Jenv)->DeleteLocalRef(Jenv, java_cstring);
}
else
{
StringPointer = NULL;
}
return (cString);
}
/*
* jdbc_convert_byte_array_to_datum Uses a byte array object passed as a jbyteArray to
* the function to convert into Datum.
*/
static Datum
jdbc_convert_byte_array_to_datum(jbyteArray byteVal)
{
Datum valueDatum;
jbyte *buf = (*Jenv)->GetByteArrayElements(Jenv, byteVal, NULL);
jsize size = (*Jenv)->GetArrayLength(Jenv, byteVal);
if (buf == NULL)
return 0;
valueDatum = (Datum) palloc0(size + VARHDRSZ);
memcpy(VARDATA(valueDatum), buf, size);
SET_VARSIZE(valueDatum, size + VARHDRSZ);
return valueDatum;
}
/*
* jdbc_convert_object_to_datum Convert jobject to Datum value
*/
static Datum
jdbc_convert_object_to_datum(Oid pgtype, int32 pgtypmod, jobject obj)
{
switch (pgtype)
{
case BYTEAOID:
return jdbc_convert_byte_array_to_datum(obj);
default:
{
/*
* By default, data is retrieved as string and then convert to
* compatible data types
*/
char *value = jdbc_convert_string_to_cstring(obj);
if (value != NULL)
return jdbc_convert_to_pg(pgtype, pgtypmod, value);
else
/* Return 0 if value is NULL */
return 0;
}
}
}
/*
* jdbc_destroy_jvm Shuts down the JVM.
*/
static void
jdbc_destroy_jvm()
{
jint res;
ereport(DEBUG3, (errmsg("In jdbc_destroy_jvm")));
res = (*jvm)->DestroyJavaVM(jvm);
/*
* jdbc_destroy_jvm will be called at on_proc_exit callback,
* so WARNING instead of ERROR for safe.
*/
if (res != JNI_OK)
elog(WARNING, "jdbc_fdw: AttachCurrentThread failed with error code %d", res);
}
/*
* jdbc_attach_jvm Attach the JVM.
*/
static void
jdbc_attach_jvm(void)
{
jint res;
ereport(DEBUG3, (errmsg("In jdbc_attach_jvm")));
res = (*jvm)->AttachCurrentThread(jvm, (void **) &Jenv, NULL);
if (res != JNI_OK)
elog(ERROR, "jdbc_fdw: AttachCurrentThread failed with error code %d", res);
}
/*
* jdbc_detach_jvm Detach the JVM.
*/
static void
jdbc_detach_jvm()
{
ereport(DEBUG3, (errmsg("In jdbc_detach_jvm")));
if (Jenv != NULL)
{
jint res = (*jvm)->DetachCurrentThread(jvm);
/*
* jdbc_detach_jvm can be call at abort transaction callback,
* so WARNING instead of ERROR for safe
*/
if (res != JNI_OK)
elog(WARNING, "jdbc_fdw: DetachCurrentThread failed with error code %d", res);
Jenv = NULL;
}
}
/*
* jdbc_jvm_init Create the JVM which will be used for calling the Java
* routines that use JDBC to connect and access the foreign database.
*
*/
void
jdbc_jvm_init(const ForeignServer *server, const UserMapping *user)
{
static bool FunctionCallCheck = false; /* This flag safeguards against
* multiple calls of
* jdbc_jvm_init() */
jint res = -5; /* Set to a negative value so we can see
* whether JVM has been correctly created or
* not */
JavaVMInitArgs vm_args;
char *classpath;
char *maxheapsizeoption = NULL;
opts.maxheapsize = 0;
ereport(DEBUG3, (errmsg("In jdbc_jvm_init")));
jdbc_get_server_options(&opts, server, user); /* Get the maxheapsize
* value (if set) */
if (FunctionCallCheck == false)
{
const char* env_classpath = getenv("CLASSPATH");
vm_args.version = JNI_VERSION_1_2;
vm_args.ignoreUnrecognized = JNI_FALSE;
vm_args.nOptions = 2;
if (env_classpath != NULL) {
classpath = psprintf("-Djava.class.path=%s" PATH_SEPARATOR "%s", STR_SHAREEXTDIR, env_classpath);
} else {
classpath = psprintf("-Djava.class.path=%s", STR_SHAREEXTDIR);
}
if (opts.maxheapsize != 0)
{
/*
* If the user has given a value for setting the max heap size of
* the JVM
*/
maxheapsizeoption = psprintf("-Xmx%dm", opts.maxheapsize);
vm_args.nOptions++;
}
vm_args.options = (JavaVMOption *) palloc0(sizeof(JavaVMOption) * vm_args.nOptions);
/*
* PostgreSQL must use its own signal handlers, so use -Xrs option to
* reduces the use of operating system signals by the JVM.
*/
vm_args.options[0].optionString = "-Xrs";
vm_args.options[1].optionString = classpath;
if (maxheapsizeoption != NULL)
{
vm_args.options[2].optionString = maxheapsizeoption;
}
/* Create the Java VM */
res = JNI_CreateJavaVM(&jvm, (void **) &Jenv, &vm_args);
if (res < 0)
{
ereport(ERROR, (errmsg("Failed to create Java VM")));
}
jdbc_attach_jvm();
ereport(DEBUG3, (errmsg("Successfully created a JVM with %d MB heapsize and classpath set to '%s'", opts.maxheapsize, classpath)));
/* Register an on_proc_exit handler that shuts down the JVM. */
on_proc_exit(jdbc_destroy_jvm, 0);
FunctionCallCheck = true;
}
else
{
int JVMEnvStat;
vm_args.version = JNI_VERSION_1_2;
JVMEnvStat = (*jvm)->GetEnv(jvm, (void **) &Jenv, vm_args.version);
if (JVMEnvStat == JNI_EDETACHED)
{
ereport(DEBUG3, (errmsg("JVMEnvStat: JNI_EDETACHED; the current thread is not attached to the VM")));
jdbc_attach_jvm();
}
else if (JVMEnvStat == JNI_OK)
{
ereport(DEBUG3, (errmsg("JVMEnvStat: JNI_OK")));
}
else if (JVMEnvStat == JNI_EVERSION)
{
ereport(ERROR, (errmsg("JVMEnvStat: JNI_EVERSION; the specified version is not supported")));
}
}
}
/*
* Create an actual JDBC connection to the foreign server. Precondition:
* jdbc_jvm_init() has been successfully called. Returns: Jconn.status =
* CONNECTION_OK and a valid reference to a JDBCUtils class Error return:
* Jconn.status = CONNECTION_BAD
*/
static JDBCUtilsInfo *
jdbc_create_JDBC_connection(const ForeignServer *server, const UserMapping *user)
{
jmethodID idCreate;
jstring stringArray[6];
jclass javaString;
jobjectArray argArray;
jclass JDBCUtilsClass;
jmethodID idGetIdentifierQuoteString;
jstring identifierQuoteString;
char *quote_string;
char *querytimeout_string;
int i;
int numParams = sizeof(stringArray) / sizeof(jstring); /* Number of parameters
* to Java */
int intSize = 10; /* The string size to allocate for an integer
* value */
int keyid = user->umid; /* key for the hashtable in java depends
* on user mapping Oid */
MemoryContext oldcontext = MemoryContextSwitchTo(TopMemoryContext); /* Switch the memory
* context to
* TopMemoryContext to
* avoid the case
* connection is
* released when
* execution state
* finished */
JDBCUtilsInfo *jdbcUtilsInfo = (JDBCUtilsInfo *) palloc0(sizeof(JDBCUtilsInfo));
jlong server_hashvalue;
jlong mapping_hashvalue;
ereport(DEBUG3, (errmsg("In jdbc_create_JDBC_connection")));
jdbcUtilsInfo->status = CONNECTION_BAD;
jdbcUtilsInfo->festate = (jdbcFdwExecutionState *) palloc0(sizeof(jdbcFdwExecutionState));
jdbcUtilsInfo->festate->query = NULL;
JDBCUtilsClass = (*Jenv)->FindClass(Jenv, "JDBCUtils");
if (JDBCUtilsClass == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils class!")));
}
idCreate = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "createConnection",
"(IJJ[Ljava/lang/String;)V");
if (idCreate == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.createConnection method!")));
}
idGetIdentifierQuoteString = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "getIdentifierQuoteString", "()Ljava/lang/String;");
if (idGetIdentifierQuoteString == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.getIdentifierQuoteString method")));
}
/*
* Construct the array to pass our parameters Query timeout is an int, we
* need a string
*/
querytimeout_string = (char *) palloc0(intSize);
snprintf(querytimeout_string, intSize, "%d", opts.querytimeout);
stringArray[0] = (*Jenv)->NewStringUTF(Jenv, opts.drivername);
stringArray[1] = (*Jenv)->NewStringUTF(Jenv, opts.url);
stringArray[2] = (*Jenv)->NewStringUTF(Jenv, opts.username);
stringArray[3] = (*Jenv)->NewStringUTF(Jenv, opts.password);
stringArray[4] = (*Jenv)->NewStringUTF(Jenv, querytimeout_string);
stringArray[5] = (*Jenv)->NewStringUTF(Jenv, opts.jarfile);
/* Set up the return value */
javaString = (*Jenv)->FindClass(Jenv, "java/lang/String");
argArray = (*Jenv)->NewObjectArray(Jenv, numParams, javaString, stringArray[0]);
if (argArray == NULL)
{
/* Return Java memory */
for (i = 0; i < numParams; i++)
{
(*Jenv)->DeleteLocalRef(Jenv, stringArray[i]);
}
ereport(ERROR, (errmsg("Failed to create argument array")));
}
for (i = 1; i < numParams; i++)
{
(*Jenv)->SetObjectArrayElement(Jenv, argArray, i, stringArray[i]);
}
jdbcUtilsInfo->JDBCUtilsObject = (*Jenv)->AllocObject(Jenv, JDBCUtilsClass);
if (jdbcUtilsInfo->JDBCUtilsObject == NULL)
{
/* Return Java memory */
for (i = 0; i < numParams; i++)
{
(*Jenv)->DeleteLocalRef(Jenv, stringArray[i]);
}
(*Jenv)->DeleteLocalRef(Jenv, argArray);
ereport(ERROR, (errmsg("Failed to create java call")));
}
server_hashvalue = (jlong) GetSysCacheHashValue1(FOREIGNSERVEROID, ObjectIdGetDatum(server->serverid));
mapping_hashvalue = (jlong) GetSysCacheHashValue1(USERMAPPINGOID, ObjectIdGetDatum(user->umid));
jq_exception_clear();
(*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idCreate, keyid, server_hashvalue, mapping_hashvalue, argArray);
jq_get_exception();
/* Return Java memory */
for (i = 0; i < numParams; i++)
{
(*Jenv)->DeleteLocalRef(Jenv, stringArray[i]);
}
(*Jenv)->DeleteLocalRef(Jenv, argArray);
ereport(DEBUG3, (errmsg("Created a JDBC connection: %s", opts.url)));
/* get default identifier quote string */
jq_exception_clear();
identifierQuoteString = (jstring) (*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idGetIdentifierQuoteString);
jq_get_exception();
quote_string = jdbc_convert_string_to_cstring((jobject) identifierQuoteString);
jdbcUtilsInfo->q_char = pstrdup(quote_string);
jdbcUtilsInfo->status = CONNECTION_OK;
pfree(querytimeout_string);
/* Switch back to old context */
MemoryContextSwitchTo(oldcontext);
return jdbcUtilsInfo;
}
/*
* Fetch the options for a jdbc_fdw foreign server and user mapping.
*/
static void
jdbc_get_server_options(JserverOptions * opts, const ForeignServer *f_server, const UserMapping *f_mapping)
{
List *options;
ListCell *lc;
/* Collect options from server and user mapping */
options = NIL;
options = list_concat(options, f_server->options);
options = list_concat(options, f_mapping->options);
/* Loop through the options, and get the values */
foreach(lc, options)
{
DefElem *def = (DefElem *) lfirst(lc);
if (strcmp(def->defname, "drivername") == 0)
{
opts->drivername = defGetString(def);
}
if (strcmp(def->defname, "username") == 0)
{
opts->username = defGetString(def);
}
if (strcmp(def->defname, "querytimeout") == 0)
{
opts->querytimeout = atoi(defGetString(def));
}
if (strcmp(def->defname, "jarfile") == 0)
{
opts->jarfile = defGetString(def);
}
if (strcmp(def->defname, "maxheapsize") == 0)
{
opts->maxheapsize = atoi(defGetString(def));
}
if (strcmp(def->defname, "password") == 0)
{
opts->password = defGetString(def);
}
if (strcmp(def->defname, "url") == 0)
{
opts->url = defGetString(def);
}
}
}
Jresult *
jq_exec(JDBCUtilsInfo * jdbcUtilsInfo, const char *query)
{
jmethodID idCreateStatement;
jstring statement;
jclass JDBCUtilsClass;
jobject JDBCUtilsObject;
Jresult *res;
ereport(DEBUG3, (errmsg("In jq_exec(%p): %s", jdbcUtilsInfo, query)));
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
res = (Jresult *) palloc0(sizeof(Jresult));
*res = PGRES_FATAL_ERROR;
idCreateStatement = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "createStatement",
"(Ljava/lang/String;)V");
if (idCreateStatement == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.createStatement method!")));
}
/* The query argument */
statement = (*Jenv)->NewStringUTF(Jenv, query);
if (statement == NULL)
{
ereport(ERROR, (errmsg("Failed to create query argument")));
}
jq_exception_clear();
(*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idCreateStatement, statement);
jq_get_exception();
/* Return Java memory */
(*Jenv)->DeleteLocalRef(Jenv, statement);
*res = PGRES_COMMAND_OK;
return res;
}
Jresult *
jq_exec_id(JDBCUtilsInfo * jdbcUtilsInfo, const char *query, int *resultSetID)
{
jmethodID idCreateStatementID;
jstring statement;
jclass JDBCUtilsClass;
jobject JDBCUtilsObject;
Jresult *res;
ereport(DEBUG3, (errmsg("In jq_exec_id(%p): %s", jdbcUtilsInfo, query)));
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
res = (Jresult *) palloc0(sizeof(Jresult));
*res = PGRES_FATAL_ERROR;
idCreateStatementID = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "createStatementID",
"(Ljava/lang/String;)I");
if (idCreateStatementID == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.createStatementID method!")));
}
/* The query argument */
statement = (*Jenv)->NewStringUTF(Jenv, query);
if (statement == NULL)
{
ereport(ERROR, (errmsg("Failed to create query argument")));
}
jq_exception_clear();
*resultSetID = (int) (*Jenv)->CallIntMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idCreateStatementID, statement);
jq_get_exception();
if (*resultSetID < 0)
{
/* Return Java memory */
(*Jenv)->DeleteLocalRef(Jenv, statement);
ereport(ERROR, (errmsg("Get resultSetID failed with code: %d", *resultSetID)));
}
ereport(DEBUG3, (errmsg("Get resultSetID successfully, ID: %d", *resultSetID)));
/* Return Java memory */
(*Jenv)->DeleteLocalRef(Jenv, statement);
*res = PGRES_COMMAND_OK;
return res;
}
void *
jq_release_resultset_id(JDBCUtilsInfo * jdbcUtilsInfo, int resultSetID)
{
jmethodID idClearResultSetID;
jclass JDBCUtilsClass;
jobject JDBCUtilsObject;
ereport(DEBUG3, (errmsg("In jq_release_resultset_id: %d", resultSetID)));
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
idClearResultSetID = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "clearResultSetID",
"(I)V");
if (idClearResultSetID == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.clearResultSetID method!")));
}
jq_exception_clear();
(*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idClearResultSetID, resultSetID);
jq_get_exception();
return NULL;
}
/*
* jq_iterate: Read the next row from the remote server
*/
TupleTableSlot *
jq_iterate(JDBCUtilsInfo * jdbcUtilsInfo, ForeignScanState *node, List *retrieved_attrs, int resultSetID)
{
jobject JDBCUtilsObject;
TupleTableSlot *tupleSlot = node->ss.ss_ScanTupleSlot;
TupleDesc tupleDescriptor = tupleSlot->tts_tupleDescriptor;
jclass JDBCUtilsClass;
jmethodID idResultSet;
jmethodID idNumberOfColumns;
jobjectArray rowArray;
int numberOfColumns;
int i;
ereport(DEBUG3, (errmsg("In jq_iterate")));
memset(tupleSlot->tts_values, 0, sizeof(Datum) * tupleDescriptor->natts);
memset(tupleSlot->tts_isnull, true, sizeof(bool) * tupleDescriptor->natts);
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
ExecClearTuple(tupleSlot);
idNumberOfColumns = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "getNumberOfColumns", "(I)I");
if (idNumberOfColumns == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.getNumberOfColumns method")));
}
jq_exception_clear();
numberOfColumns = (int) (*Jenv)->CallIntMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idNumberOfColumns, resultSetID);
jq_get_exception();
if (numberOfColumns < 0)
{
ereport(ERROR, (errmsg("getNumberOfColumns got wrong value: %d", numberOfColumns)));
}
if ((*Jenv)->PushLocalFrame(Jenv, (numberOfColumns + 10)) < 0)
{
ereport(ERROR, (errmsg("Error pushing local java frame")));
}
idResultSet = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "getResultSet", "(I)[Ljava/lang/Object;");
if (idResultSet == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.getResultSet method!")));
}
/* Allocate pointers to the row data */
jq_exception_clear();
rowArray = (*Jenv)->CallObjectMethod(Jenv, JDBCUtilsObject, idResultSet, resultSetID);
jq_get_exception();
if (rowArray != NULL)
{
if (retrieved_attrs != NIL)
{
for (i = 0; i < retrieved_attrs->length; i++)
{
int column_index = retrieved_attrs->elements[i].int_value - 1;
Oid pgtype = TupleDescAttr(tupleDescriptor, column_index)->atttypid;
int32 pgtypmod = TupleDescAttr(tupleDescriptor, column_index)->atttypmod;
jobject obj = (jobject) (*Jenv)->GetObjectArrayElement(Jenv, rowArray, i);
if (obj != NULL)
{
tupleSlot->tts_isnull[column_index] = false;
tupleSlot->tts_values[column_index] = jdbc_convert_object_to_datum(pgtype, pgtypmod, obj);
}
}
}
ExecStoreVirtualTuple(tupleSlot);
(*Jenv)->DeleteLocalRef(Jenv, rowArray);
}
(*Jenv)->PopLocalFrame(Jenv, NULL);
return (tupleSlot);
}
/*
* jq_iterate_all_row: Read the all row from the remote server without an existing foreign table
*/
void
jq_iterate_all_row(FunctionCallInfo fcinfo, JDBCUtilsInfo * jdbcUtilsInfo, TupleDesc tupleDescriptor, int resultSetID)
{
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
jobject JDBCUtilsObject;
jclass JDBCUtilsClass;
jmethodID idResultSet;
jmethodID idNumberOfColumns;
jobjectArray rowArray;
Tuplestorestate *tupstore;
HeapTuple tuple = NULL;
MemoryContext oldcontext;
Datum *values;
bool *nulls;
int numberOfColumns;
ereport(DEBUG3, (errmsg("In jq_iterate_all_row")));
oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
tupstore = tuplestore_begin_heap(true, false, work_mem);
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
idNumberOfColumns = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "getNumberOfColumns", "(I)I");
if (idNumberOfColumns == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.getNumberOfColumns method")));
}
jq_exception_clear();
numberOfColumns = (int) (*Jenv)->CallIntMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idNumberOfColumns, resultSetID);
jq_get_exception();
if (numberOfColumns < 0)
{
ereport(ERROR, (errmsg("getNumberOfColumns got wrong value: %d", numberOfColumns)));
}
if ((*Jenv)->PushLocalFrame(Jenv, (numberOfColumns + 10)) < 0)
{
ereport(ERROR, (errmsg("Error pushing local java frame")));
}
idResultSet = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "getResultSet", "(I)[Ljava/lang/Object;");
if (idResultSet == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.getResultSet method!")));
}
do
{
/* Allocate pointers to the row data */
jq_exception_clear();
rowArray = (*Jenv)->CallObjectMethod(Jenv, JDBCUtilsObject, idResultSet, resultSetID);
jq_get_exception();
if (rowArray != NULL)
{
values = (Datum *) palloc0(tupleDescriptor->natts * sizeof(Datum));
nulls = (bool *) palloc(tupleDescriptor->natts * sizeof(bool));
/* Initialize to nulls for any columns not present in result */
memset(nulls, true, tupleDescriptor->natts * sizeof(bool));
for (int i = 0; i < numberOfColumns; i++)
{
int column_index = i;
Oid pgtype = TupleDescAttr(tupleDescriptor, column_index)->atttypid;
int32 pgtypmod = TupleDescAttr(tupleDescriptor, column_index)->atttypmod;
jobject obj = (jobject) (*Jenv)->GetObjectArrayElement(Jenv, rowArray, i);
if (obj != NULL)
{
values[column_index] = jdbc_convert_object_to_datum(pgtype, pgtypmod, obj);
nulls[column_index] = false;
}
}
tuple = heap_form_tuple(tupleDescriptor, values, nulls);
tuplestore_puttuple(tupstore, tuple);
(*Jenv)->DeleteLocalRef(Jenv, rowArray);
}
}
while (rowArray != NULL);
if (tuple != NULL)
{
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupleDescriptor;
MemoryContextSwitchTo(oldcontext);
}
(*Jenv)->PopLocalFrame(Jenv, NULL);
}
Jresult *
jq_exec_prepared(JDBCUtilsInfo * jdbcUtilsInfo, const int *paramLengths,
const int *paramFormats, int resultFormat, int resultSetID)
{
jmethodID idExecPreparedStatement;
jclass JDBCUtilsClass;
jobject JDBCUtilsObject;
Jresult *res;
ereport(DEBUG3, (errmsg("In jq_exec_prepared")));
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
res = (Jresult *) palloc0(sizeof(Jresult));
*res = PGRES_FATAL_ERROR;
idExecPreparedStatement = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "execPreparedStatement",
"(I)V");
if (idExecPreparedStatement == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.execPreparedStatement method!")));
}
jq_exception_clear();
(*Jenv)->CallObjectMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idExecPreparedStatement, resultSetID);
jq_get_exception();
/* Return Java memory */
*res = PGRES_COMMAND_OK;
return res;
}
void
jq_clear(Jresult * res)
{
ereport(DEBUG3, (errmsg("In jq_clear")));
pfree(res);
return;
}
char *
jq_cmd_tuples(Jresult * res)
{
ereport(DEBUG3, (errmsg("In jq_cmd_tuples")));
return 0;
}
char *
jq_get_value(const Jresult * res, int tup_num, int field_num)
{
ereport(DEBUG3, (errmsg("In jq_get_value")));
return 0;
}
Jresult *
jq_prepare(JDBCUtilsInfo * jdbcUtilsInfo, const char *query,
const Oid *paramTypes, int *resultSetID)
{
jmethodID idCreatePreparedStatement;
jstring statement;
jclass JDBCUtilsClass;
jobject JDBCUtilsObject;
Jresult *res;
ereport(DEBUG3, (errmsg("In jq_prepare(%p): %s", jdbcUtilsInfo, query)));
jq_get_JDBCUtils(jdbcUtilsInfo, &JDBCUtilsClass, &JDBCUtilsObject);
res = (Jresult *) palloc0(sizeof(Jresult));
*res = PGRES_FATAL_ERROR;
idCreatePreparedStatement = (*Jenv)->GetMethodID(Jenv, JDBCUtilsClass, "createPreparedStatement",
"(Ljava/lang/String;)I");
if (idCreatePreparedStatement == NULL)
{
ereport(ERROR, (errmsg("Failed to find the JDBCUtils.createPreparedStatement method!")));
}
/* The query argument */
statement = (*Jenv)->NewStringUTF(Jenv, query);
if (statement == NULL)
{
ereport(ERROR, (errmsg("Failed to create query argument")));
}
jq_exception_clear();
/* get the resultSetID */
*resultSetID = (int) (*Jenv)->CallIntMethod(Jenv, jdbcUtilsInfo->JDBCUtilsObject, idCreatePreparedStatement, statement);
jq_get_exception();
if (*resultSetID < 0)
{
/* Return Java memory */
(*Jenv)->DeleteLocalRef(Jenv, statement);
ereport(ERROR, (errmsg("Get resultSetID failed with code: %d", *resultSetID)));
}
ereport(DEBUG3, (errmsg("Get resultSetID successfully, ID: %d", *resultSetID)));
/* Return Java memory */
(*Jenv)->DeleteLocalRef(Jenv, statement);
*res = PGRES_COMMAND_OK;
return res;
}
int
jq_nfields(const Jresult * res)
{
ereport(DEBUG3, (errmsg("In jq_nfields")));
return 0;
}
int
jq_get_is_null(const Jresult * res, int tup_num, int field_num)
{
ereport(DEBUG3, (errmsg("In jq_get_is_null")));
return 0;
}
JDBCUtilsInfo *
jq_connect_db_params(const ForeignServer *server, const UserMapping *user,
const char *const *keywords, const char *const *values)
{
JDBCUtilsInfo *jdbcUtilsInfo;
int i = 0;