java_Dbc.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:4k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: java_Dbc.c,v 11.10 2000/10/25 19:54:55 dda Exp $";
- #endif /* not lint */
- #include <jni.h>
- #include <errno.h>
- #include <stdlib.h>
- #include <string.h>
- #ifdef DIAGNOSTIC
- #include <stdio.h>
- #endif
- #include "db.h"
- #include "db_int.h"
- #include "java_util.h"
- #include "com_sleepycat_db_Dbc.h"
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbc_close
- (JNIEnv *jnienv, jobject jthis)
- {
- int err;
- DBC *dbc = get_DBC(jnienv, jthis);
- if (!verify_non_null(jnienv, dbc))
- return;
- err = dbc->c_close(dbc);
- if (verify_return(jnienv, err, 0)) {
- set_private_dbobj(jnienv, name_DBC, jthis, 0);
- }
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbc_count
- (JNIEnv *jnienv, jobject jthis, jint flags)
- {
- int err;
- DBC *dbc = get_DBC(jnienv, jthis);
- db_recno_t count;
- if (!verify_non_null(jnienv, dbc))
- return (0);
- err = dbc->c_count(dbc, &count, flags);
- verify_return(jnienv, err, 0);
- return (count);
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbc_del
- (JNIEnv *jnienv, jobject jthis, jint flags)
- {
- int err;
- DBC *dbc = get_DBC(jnienv, jthis);
- if (!verify_non_null(jnienv, dbc))
- return (0);
- err = dbc->c_del(dbc, flags);
- if (err != DB_KEYEMPTY) {
- verify_return(jnienv, err, 0);
- }
- return (err);
- }
- JNIEXPORT jobject JNICALL Java_com_sleepycat_db_Dbc_dup
- (JNIEnv *jnienv, jobject jthis, jint flags)
- {
- int err;
- DBC *dbc = get_DBC(jnienv, jthis);
- DBC *dbc_ret = NULL;
- if (!verify_non_null(jnienv, dbc))
- return (0);
- err = dbc->c_dup(dbc, &dbc_ret, flags);
- if (!verify_return(jnienv, err, 0))
- return (0);
- return (get_Dbc(jnienv, dbc_ret));
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbc_get
- (JNIEnv *jnienv, jobject jthis,
- /*Dbt*/ jobject key, /*Dbt*/ jobject data, jint flags)
- {
- int err, retry, op_flags;
- DBC *dbc;
- JDBT dbkey, dbdata;
- OpKind keyop, dataop;
- /* Depending on flags, the user may be supplying the key,
- * or else we may have to retrieve it.
- */
- err = 0;
- keyop = outOp;
- dataop = outOp;
- op_flags = flags & DB_OPFLAGS_MASK;
- if (op_flags == DB_SET) {
- keyop = inOp;
- }
- else if (op_flags == DB_SET_RANGE ||
- op_flags == DB_SET_RECNO) {
- keyop = inOutOp;
- }
- else if (op_flags == DB_GET_BOTH) {
- keyop = inOutOp;
- dataop = inOutOp;
- }
- dbc = get_DBC(jnienv, jthis);
- if (jdbt_lock(&dbkey, jnienv, key, keyop) != 0)
- goto out2;
- if (jdbt_lock(&dbdata, jnienv, data, dataop) != 0)
- goto out1;
- if (!verify_non_null(jnienv, dbc))
- goto out1;
- for (retry = 0; retry < 3; retry++) {
- err = dbc->c_get(dbc, &dbkey.dbt->dbt, &dbdata.dbt->dbt, flags);
- /* If we failed due to lack of memory in our DBT arrays,
- * retry.
- */
- if (err != ENOMEM)
- break;
- if (!jdbt_realloc(&dbkey, jnienv) && !jdbt_realloc(&dbdata, jnienv))
- break;
- }
- if (err != DB_NOTFOUND) {
- verify_return(jnienv, err, 0);
- }
- out1:
- jdbt_unlock(&dbdata, jnienv);
- out2:
- jdbt_unlock(&dbkey, jnienv);
- return (err);
- }
- JNIEXPORT jint JNICALL Java_com_sleepycat_db_Dbc_put
- (JNIEnv *jnienv, jobject jthis,
- /*Dbt*/ jobject key, /*Dbt*/ jobject data, jint flags)
- {
- int err;
- DBC *dbc;
- JDBT dbkey, dbdata;
- err = 0;
- dbc = get_DBC(jnienv, jthis);
- if (jdbt_lock(&dbkey, jnienv, key, inOp) != 0)
- goto out2;
- if (jdbt_lock(&dbdata, jnienv, data, inOp) != 0)
- goto out1;
- if (!verify_non_null(jnienv, dbc))
- goto out1;
- err = dbc->c_put(dbc, &dbkey.dbt->dbt, &dbdata.dbt->dbt, flags);
- if (err != DB_KEYEXIST) {
- verify_return(jnienv, err, 0);
- }
- out1:
- jdbt_unlock(&dbdata, jnienv);
- out2:
- jdbt_unlock(&dbkey, jnienv);
- return (err);
- }
- JNIEXPORT void JNICALL Java_com_sleepycat_db_Dbc_finalize
- (JNIEnv *jnienv, jobject jthis)
- {
- /* Free any data related to DBC here.
- * If we ever have java-only data embedded in the DBC
- * and need to do this, we'll have to track Dbc's
- * according to which Db owns them, just as
- * we track Db's according to which DbEnv owns them.
- * That's necessary to avoid double freeing that
- * comes about when closes interact with GC.
- */
- #ifdef DIAGNOSTIC
- DBC *dbc;
- dbc = get_DBC(jnienv, jthis);
- if (dbc != NULL)
- fprintf(stderr, "Java API: Dbc has not been closedn");
- #else
- COMPQUIET(jnienv, NULL);
- COMPQUIET(jthis, NULL);
- #endif
- }