enh: java connector support get table vgid (#18981)

* java connector support get table vgid

* add export to com_taosdata_jdbc_TSDBJNIConnector.h

source/client/jni/com_taosdata_jdbc_TSDBJNIConnector.h

@@ -260,6 +260,14 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_insertLinesImp(JN
 JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_schemalessInsertImp(JNIEnv *, jobject, jobjectArray,
                                                                                     jlong, jint, jint);
 
+/**
+ * Class:     com_taosdata_jdbc_TSDBJNIConnector
+ * Method:    getTableVgID
+ * Signature: (Ljava/lang/String;Ljava/lang/String)Lcom/taosdata/jdbc/VGroupIDResp
+ */
+JNIEXPORT jobject JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getTableVgID(JNIEnv *, jobject, jlong, jstring,
+                                                                               jstring, jobject);
+
 #ifdef __cplusplus
 }
 #endif

source/client/src/clientJniConnector.c

@@ -488,7 +488,8 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
                numOfFields);
       return JNI_FETCH_END;
     } else {
-      jniDebug("jobj:%p, conn:%p, interrupted query. fetch row error code: %d, msg:%s", jobj, tscon, code, taos_errstr(result));
+      jniDebug("jobj:%p, conn:%p, interrupted query. fetch row error code: %d, msg:%s", jobj, tscon, code,
+               taos_errstr(result));
       return JNI_RESULT_SET_NULL;
     }
   }
@@ -583,7 +584,8 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchBlockImp(JNI
       jniDebug("jobj:%p, conn:%p, resultset:%p, no data to retrieve", jobj, tscon, (void *)res);
       return JNI_FETCH_END;
     } else {
-      jniError("jobj:%p, conn:%p, query interrupted. fetch block error code:%d, msg:%s", jobj, tscon, error_code, taos_errstr(tres));
+      jniError("jobj:%p, conn:%p, query interrupted. fetch block error code:%d, msg:%s", jobj, tscon, error_code,
+               taos_errstr(tres));
       return JNI_RESULT_SET_NULL;
     }
   }
@@ -1028,3 +1030,62 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_schemalessInsert
   }
   return (jlong)tres;
 }
+
+// TABLE_VG_ID_FID_CACHE cache resp object for getTableVgID
+typedef struct TABLE_VG_ID_FIELD_CACHE {
+  int      cached;
+  jclass   clazz;
+  jfieldID codeField;
+  jfieldID vgIDField;
+} TABLE_VG_ID_FIELD_CACHE;
+
+TABLE_VG_ID_FIELD_CACHE tableVgIdFieldCache;
+
+void cacheTableVgIDField(JNIEnv *env, jobject jobj) {
+  if (tableVgIdFieldCache.cached) {
+    return;
+  }
+
+  tableVgIdFieldCache.clazz = (*env)->GetObjectClass(env, jobj);
+  tableVgIdFieldCache.codeField = (*env)->GetFieldID(env, tableVgIdFieldCache.clazz, "code", "I");
+  tableVgIdFieldCache.vgIDField = (*env)->GetFieldID(env, tableVgIdFieldCache.clazz, "vgID", "I");
+  tableVgIdFieldCache.cached = 1;
+}
+
+JNIEXPORT jobject JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getTableVgID(JNIEnv *env, jobject jobj, jlong conn,
+                                                                               jstring jdb, jstring jtable,
+                                                                               jobject resp) {
+  if (!tableVgIdFieldCache.cached) {
+    cacheTableVgIDField(env, resp);
+  }
+
+  TAOS *taos = (TAOS *)conn;
+  if (taos == NULL) {
+    jniError("jobj:%p, connection already closed", jobj);
+    (*env)->SetIntField(env, resp, tableVgIdFieldCache.codeField, JNI_CONNECTION_NULL);
+    return resp;
+  }
+
+  const char *db = NULL;
+  const char *table = NULL;
+  int         vgID = 0;
+
+  if (jdb != NULL) {
+    db = (*env)->GetStringUTFChars(env, jdb, NULL);
+  }
+  if (jtable != NULL) {
+    table = (*env)->GetStringUTFChars(env, jtable, NULL);
+  }
+
+  int code = taos_get_table_vgId(taos, db, table, &vgID);
+  if (db != NULL) {
+    (*env)->ReleaseStringUTFChars(env, jdb, db);
+  }
+  if (table != NULL) {
+    (*env)->ReleaseStringUTFChars(env, jtable, table);
+  }
+
+  (*env)->SetIntField(env, resp, tableVgIdFieldCache.codeField, code);
+  (*env)->SetIntField(env, resp, tableVgIdFieldCache.vgIDField, vgID);
+  return resp;
+}