[td-11818] implementate the taos_fetch_row .

include/common/taosmsg.h

@@ -804,7 +804,7 @@ typedef struct {
 } SVgroupsMsg, SVgroupsInfo;
 
 typedef struct {
-  char       tbFname[TSDB_TABLE_FNAME_LEN];  // table id
+  char       tbFname[TSDB_TABLE_FNAME_LEN];  // table full name
   char       stbFname[TSDB_TABLE_FNAME_LEN];
   int32_t    numOfTags;
   int32_t    numOfColumns;

include/libs/parser/parser.h

@@ -151,7 +151,7 @@ typedef struct SParseContext {
  * @param msg      extended error message if exists.
  * @return         error code
  */
-int32_t qParseQuerySql(const char* pStr, size_t length, int64_t id, int32_t* type, void** pOutput, char* msg, int32_t msgLen);
+int32_t qParseQuerySql(const char* pStr, size_t length, int64_t id, int32_t* type, void** pOutput, int32_t* outputLen, char* msg, int32_t msgLen);
 
 typedef enum {
   PAYLOAD_TYPE_KV = 0,

source/client/inc/clientInt.h

@@ -20,14 +20,15 @@
 extern "C" {
 #endif
 
+#include <common.h>
 #include "taos.h"
 #include "taosmsg.h"
+#include "tdef.h"
+#include "tep.h"
 #include "thash.h"
 #include "tlist.h"
-#include "trpc.h"
-#include "tdef.h"
 #include "tmsgtype.h"
-#include "tep.h"
+#include "trpc.h"
 
 typedef struct SQueryExecMetric {
   int64_t      start;    // start timestamp
@@ -86,10 +87,18 @@ typedef struct STscObj {
   SAppInstInfo      *pAppInfo;
 } STscObj;
 
+typedef struct SClientResultInfo {
+  SSDataBlock *pData;
+  TAOS_FIELD  *resultFields;
+  int32_t      current;
+} SClientResultInfo;
+
 typedef struct SReqBody {
   tsem_t    rspSem;        // not used now
   void*     fp;
   void*     param;
+  int32_t   paramLen;
+  SClientResultInfo* pResInfo;
 } SRequestBody;
 
 #define ERROR_MSG_BUF_DEFAULT_SIZE  512
@@ -142,6 +151,8 @@ void initMsgHandleFp();
 TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass, const char *auth, const char *db, uint16_t port);
 TAOS_RES *taos_query_l(TAOS *taos, const char *sql, size_t sqlLen);
 
+void* doFetchRow(SRequestObj* pRequest);
+
 #ifdef __cplusplus
 }
 #endif

source/client/src/clientImpl.c

@@ -149,11 +149,12 @@ TAOS_RES *taos_query_l(TAOS *taos, const char *sql, size_t sqlLen) {
   } else {
     int32_t type = 0;
     void*   output = NULL;
-
-    code = qParseQuerySql(pRequest->sqlstr, sqlLen, pRequest->requestId, &type, &output, pRequest->msgBuf, ERROR_MSG_BUF_DEFAULT_SIZE);
+    int32_t outputLen = 0;
+    code = qParseQuerySql(pRequest->sqlstr, sqlLen, pRequest->requestId, &type, &output, &outputLen, pRequest->msgBuf, ERROR_MSG_BUF_DEFAULT_SIZE);
     if (type == TSDB_SQL_CREATE_USER || type == TSDB_SQL_SHOW) {
       pRequest->type = type;
       pRequest->body.param = output;
+      pRequest->body.paramLen = outputLen;
 
       SRequestMsgBody body = {0};
       buildRequestMsgFp[type](pRequest, &body);
@@ -374,4 +375,21 @@ TAOS *taos_connect_l(const char *ip, int ipLen, const char *user, int userLen, c
   strncpy(passStr, pass, MIN(TSDB_PASSWORD_LEN - 1, passLen));
   strncpy(dbStr,   db,   MIN(TSDB_DB_NAME_LEN - 1, dbLen));
   return taos_connect(ipStr, userStr, passStr, dbStr, port);
+}
+
+void* doFetchRow(SRequestObj* pRequest) {
+  assert(pRequest != NULL);
+  SClientResultInfo* pResultInfo = pRequest->body.pResInfo;
+
+  if (pResultInfo == NULL || pResultInfo->current >= pResultInfo->pData->info.rows) {
+    if (pResultInfo == NULL) {
+      pRequest->body.pResInfo = calloc(1, sizeof(SClientResultInfo));
+//      pRequest->body.pResInfo.
+    }
+    // current data set are exhausted, fetch more result from node
+//    if (pRes->row >= pRes->numOfRows && needToFetchNewBlock(pSql)) {
+//      taos_fetch_rows_a(res, waitForRetrieveRsp, pSql->pTscObj);
+//      tsem_wait(&pSql->rspSem);
+//    }
+  }
 }
\ No newline at end of file

source/client/src/clientMain.c

@@ -117,3 +117,17 @@ TAOS_RES *taos_query(TAOS *taos, const char *sql) {
 
   return taos_query_l(taos, sql, strlen(sql));
 }
+
+TAOS_ROW taos_fetch_row(TAOS_RES *pRes) {
+  if (pRes == NULL) {
+    return NULL;
+  }
+
+  SRequestObj *pRequest = (SRequestObj *) pRes;
+  if (pRequest->type == TSDB_SQL_RETRIEVE_EMPTY_RESULT ||
+      pRequest->type == TSDB_SQL_INSERT) {
+    return NULL;
+  }
+
+  return doFetchRow(pRequest);
+}

source/client/src/clientMsgHandler.c

@@ -13,6 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <catalog.h>
 #include "clientInt.h"
 #include "clientLog.h"
 #include "os.h"
@@ -3165,7 +3166,74 @@ int32_t buildCreateUserMsg(SRequestObj *pRequest, SRequestMsgBody* pMsgBody) {
   pMsgBody->msgType         = TSDB_MSG_TYPE_CREATE_USER;
   pMsgBody->msgLen          = sizeof(SCreateUserMsg);
   pMsgBody->requestObjRefId = pRequest->self;
-  pMsgBody->pData = pRequest->body.param;
+  pMsgBody->pData           = pRequest->body.param;
+  return 0;
+}
+
+int32_t buildShowMsg(SRequestObj* pRequest, SRequestMsgBody* pMsgBody) {
+  pMsgBody->msgType         = TSDB_MSG_TYPE_SHOW;
+  pMsgBody->msgLen          = pRequest->body.paramLen;
+  pMsgBody->requestObjRefId = pRequest->self;
+  pMsgBody->pData           = pRequest->body.param;
+}
+
+STableMeta* createTableMetaFromMsg(STableMetaMsg* pTableMetaMsg) {
+  assert(pTableMetaMsg != NULL && pTableMetaMsg->numOfColumns >= 2);
+
+  size_t schemaSize = (pTableMetaMsg->numOfColumns + pTableMetaMsg->numOfTags) * sizeof(SSchema);
+  STableMeta* pTableMeta = calloc(1, sizeof(STableMeta) + schemaSize);
+
+  pTableMeta->tableType = pTableMetaMsg->tableType;
+  pTableMeta->vgId      = pTableMetaMsg->vgroup.vgId;
+  pTableMeta->suid      = pTableMetaMsg->suid;
+  pTableMeta->uid       = pTableMetaMsg->tuid;
+
+  pTableMeta->tableInfo = (STableComInfo) {
+      .numOfTags    = pTableMetaMsg->numOfTags,
+      .precision    = pTableMetaMsg->precision,
+      .numOfColumns = pTableMetaMsg->numOfColumns,
+  };
+
+  pTableMeta->sversion = pTableMetaMsg->sversion;
+  pTableMeta->tversion = pTableMetaMsg->tversion;
+
+  memcpy(pTableMeta->schema, pTableMetaMsg->pSchema, schemaSize);
+
+  int32_t numOfTotalCols = pTableMeta->tableInfo.numOfColumns;
+  for(int32_t i = 0; i < numOfTotalCols; ++i) {
+    pTableMeta->tableInfo.rowSize += pTableMeta->schema[i].bytes;
+  }
+
+  return pTableMeta;
+}
+
+int32_t processShowRsp(SRequestObj *pRequest, const char* pMsg, int32_t msgLen) {
+  SShowRsp* pShow = (SShowRsp *)pMsg;
+  pShow->showId   = htonl(pShow->showId);
+
+  STableMetaMsg *pMetaMsg = &(pShow->tableMeta);
+  pMetaMsg->numOfColumns = htonl(pMetaMsg->numOfColumns);
+
+  SSchema* pSchema = pMetaMsg->pSchema;
+  pMetaMsg->tuid = htobe64(pMetaMsg->tuid);
+  for (int i = 0; i < pMetaMsg->numOfColumns; ++i) {
+    pSchema->bytes = htons(pSchema->bytes);
+    pSchema++;
+  }
+
+  STableMeta* pTableMeta = createTableMetaFromMsg(pMetaMsg);
+  SSchema *pTableSchema = pTableMeta->schema;
+
+  TAOS_FIELD* pFields = calloc(1, pTableMeta->tableInfo.numOfColumns);
+  for (int16_t i = 0; i < pTableMeta->tableInfo.numOfColumns; ++i, ++pSchema) {
+    tstrncpy(pFields[i].name, pTableSchema[i].name, tListLen(pFields[i].name));
+    pFields[i].type  = pTableSchema[i].type;
+    pFields[i].bytes = pTableSchema[i].bytes;
+  }
+
+//  pRequest->body.resultFields = pFields;
+//  pRequest->body.numOfFields = pTableMeta->tableInfo.numOfColumns;
+
   return 0;
 }
 
@@ -3250,5 +3318,7 @@ void initMsgHandleFp() {
 
   buildRequestMsgFp[TSDB_SQL_CREATE_USER]  = buildCreateUserMsg;
 
+  buildRequestMsgFp[TSDB_SQL_SHOW]         = buildShowMsg;
+  handleRequestRspFp[TSDB_SQL_SHOW]        = processShowRsp;
 
 }
\ No newline at end of file

source/client/test/clientTests.cpp

@@ -37,14 +37,16 @@ TEST(testCase, driverInit_Test) {
   TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
-  TAOS_RES* pRes = taos_query(pConn, "create user abc pass 'abc'");
-  if (taos_errno(pRes) != TSDB_CODE_SUCCESS) {
-    printf("failed to create user, reason:%s\n", taos_errstr(pRes));
-  }
-
-  taos_free_result(pRes);
-
-  pRes = taos_query(pConn, "show users");
+//  TAOS_RES* pRes = taos_query(pConn, "create user abc pass 'abc'");
+//  if (taos_errno(pRes) != TSDB_CODE_SUCCESS) {
+//    printf("failed to create user, reason:%s\n", taos_errstr(pRes));
+//  }
+//
+//  taos_free_result(pRes);
+
+  TAOS_RES* pRes = taos_query(pConn, "show users");
+  TAOS_ROW pRow = taos_fetch_row(pRes);
+  assert(pRow != NULL);
 
   taos_close(pConn);
 }
\ No newline at end of file

source/dnode/mnode/impl/src/mndUser.c

@@ -471,7 +471,7 @@ static int32_t mndGetUserMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaMsg *p
   pSchema[cols].bytes = htons(pShow->bytes[cols]);
   cols++;
 
-  pMeta->numOfColumns = htons(cols);
+  pMeta->numOfColumns = htonl(cols);
   pShow->numOfColumns = cols;
 
   pShow->offset[0] = 0;

source/libs/parser/inc/parserInt.h

@@ -60,7 +60,7 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pSqlInfo, SQ
  * @param type
  * @return
  */
-int32_t qParserValidateDdlSqlNode(SSqlInfo* pInfo, int64_t id, void** output, int32_t* type, char* msgBuf, int32_t msgBufLen);
+int32_t qParserValidateDclSqlNode(SSqlInfo* pInfo, int64_t id, void** output, int32_t* outputLen, int32_t* type, char* msgBuf, int32_t msgBufLen);
 
 /**
  * Evaluate the numeric and timestamp arithmetic expression in the WHERE clause.

source/libs/parser/inc/parserUtil.h

@@ -65,7 +65,7 @@ int32_t    getExprFunctionId(SExprInfo *pExprInfo);
 
 STableMeta* tableMetaDup(const STableMeta* pTableMeta);
 
-bool isDdlSql(SSqlInfo* pSqlInfo);
+bool isDclSqlStatement(SSqlInfo* pSqlInfo);
 
 #ifdef __cplusplus
 }

source/libs/parser/src/astValidate.c

@@ -4069,7 +4069,93 @@ int32_t qParserValidateSqlNode(struct SCatalog* pCatalog, SSqlInfo* pInfo, SQuer
   return code;
 }
 
-int32_t qParserValidateDdlSqlNode(SSqlInfo* pInfo, int64_t id, void** output, int32_t* type, char* msgBuf, int32_t msgBufLen) {
+// todo remove it
+static int32_t setShowInfo(struct SSqlInfo* pInfo, void** output, int32_t* msgLen, SMsgBuf* pMsgBuf) {
+  const char* msg1 = "invalid name";
+  const char* msg2 = "wildcard string should be less than %d characters";
+  const char* msg3 = "database name too long";
+  const char* msg4 = "pattern is invalid";
+  const char* msg5 = "database name is empty";
+  const char* msg6 = "pattern string is empty";
+
+  /*
+   * database prefix in pInfo->pMiscInfo->a[0]
+   * wildcard in like clause in pInfo->pMiscInfo->a[1]
+   */
+  SShowInfo* pShowInfo = &pInfo->pMiscInfo->showOpt;
+  int16_t    showType = pShowInfo->showType;
+  if (showType == TSDB_MGMT_TABLE_TABLE || showType == TSDB_MGMT_TABLE_VGROUP) {
+    SToken* pDbPrefixToken = &pShowInfo->prefix;
+    if (pDbPrefixToken->type != 0) {
+      if (pDbPrefixToken->n >= TSDB_DB_NAME_LEN) {  // db name is too long
+        return buildInvalidOperationMsg(pMsgBuf, msg3);
+      }
+
+      if (pDbPrefixToken->n <= 0) {
+        return buildInvalidOperationMsg(pMsgBuf, msg5);
+      }
+
+      if (parserValidateIdToken(pDbPrefixToken) != TSDB_CODE_SUCCESS) {
+        return buildInvalidOperationMsg(pMsgBuf, msg1);
+      }
+
+      //      int32_t ret = tNameSetDbName(&pTableMetaInfo->name, getAccountId(pRequest->pTsc), pDbPrefixToken);
+      //      if (ret != TSDB_CODE_SUCCESS) {
+      //        return buildInvalidOperationMsg(pMsgBuf, msg1);
+      //      }
+    }
+
+    // show table/stable like 'xxxx', set the like pattern for show tables
+    SToken* pPattern = &pShowInfo->pattern;
+    if (pPattern->type != 0) {
+      if (pPattern->type == TK_ID && pPattern->z[0] == TS_ESCAPE_CHAR) {
+        return buildInvalidOperationMsg(pMsgBuf, msg4);
+      }
+
+      pPattern->n = strdequote(pPattern->z);
+      if (pPattern->n <= 0) {
+        return buildInvalidOperationMsg(pMsgBuf, msg6);
+      }
+
+      if (pPattern->n > tsMaxWildCardsLen) {
+        char tmp[64] = {0};
+        sprintf(tmp, msg2, tsMaxWildCardsLen);
+        return buildInvalidOperationMsg(pMsgBuf, tmp);
+      }
+    }
+  } else if (showType == TSDB_MGMT_TABLE_VNODES) {
+    if (pShowInfo->prefix.type == 0) {
+      return buildInvalidOperationMsg(pMsgBuf, "No specified dnode ep");
+    }
+
+    if (pShowInfo->prefix.type == TK_STRING) {
+      pShowInfo->prefix.n = strdequote(pShowInfo->prefix.z);
+    }
+  }
+
+  SShowMsg* pShowMsg = calloc(1, sizeof(SShowMsg));
+  pShowMsg->type = pShowInfo->showType;
+
+  if (pShowInfo->showType != TSDB_MGMT_TABLE_VNODES) {
+    SToken* pPattern = &pShowInfo->pattern;
+    if (pPattern->type > 0) {  // only show tables support wildcard query
+      strncpy(pShowMsg->payload, pPattern->z, pPattern->n);
+      pShowMsg->payloadLen = htons(pPattern->n);
+    }
+  } else {
+    SToken* pEpAddr = &pShowInfo->prefix;
+    assert(pEpAddr->n > 0 && pEpAddr->type > 0);
+
+    strncpy(pShowMsg->payload, pEpAddr->z, pEpAddr->n);
+    pShowMsg->payloadLen = htons(pEpAddr->n);
+  }
+
+  *output = pShowMsg;
+  *msgLen = sizeof(SShowMsg) + htons(pShowMsg->payloadLen);
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t qParserValidateDclSqlNode(SSqlInfo* pInfo, int64_t id, void** output, int32_t* outputLen, int32_t* type, char* msgBuf, int32_t msgBufLen) {
   int32_t code = 0;
 
   SMsgBuf m = {.buf = msgBuf, .len = msgBufLen};
@@ -4125,9 +4211,14 @@ int32_t qParserValidateDdlSqlNode(SSqlInfo* pInfo, int64_t id, void** output, in
       *output = buildUserManipulationMsg(pInfo, id, msgBuf, msgBufLen);
       break;
     }
+    
+    case TSDB_SQL_SHOW: {
+      code = setShowInfo(pInfo, output, outputLen, pMsgBuf);
+      break;
+    }
     default:
       break;
   }
 
-  return 0;
+  return code;
 }

source/libs/parser/src/parser.c

@@ -31,7 +31,7 @@ bool qIsInsertSql(const char* pStr, size_t length) {
   } while (1);
 }
 
-int32_t qParseQuerySql(const char* pStr, size_t length, int64_t id, int32_t *type, void** pOutput, char* msg, int32_t msgLen) {
+int32_t qParseQuerySql(const char* pStr, size_t length, int64_t id, int32_t *type, void** pOutput, int32_t* outputLen, char* msg, int32_t msgLen) {
   SQueryStmtInfo* pQueryInfo = calloc(1, sizeof(SQueryStmtInfo));
   if (pQueryInfo == NULL) {
     terrno = TSDB_CODE_TSC_OUT_OF_MEMORY; // set correct error code.
@@ -45,8 +45,8 @@ int32_t qParseQuerySql(const char* pStr, size_t length, int64_t id, int32_t *typ
     return terrno;
   }
 
-  if (isDdlSql(&info)) {
-    int32_t code = qParserValidateDdlSqlNode(&info, id, pOutput, type, msg, msgLen);
+  if (isDclSqlStatement(&info)) {
+    int32_t code = qParserValidateDclSqlNode(&info, id, pOutput, outputLen, type, msg, msgLen);
     if (code == TSDB_CODE_SUCCESS) {
       // do nothing
     }

source/libs/parser/src/parserUtil.c

@@ -12,8 +12,7 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
-#include "parserUtil.h"
-#include <tmsgtype.h>
+
 
 #include "taosmsg.h"
 #include "parser.h"
@@ -23,6 +22,8 @@
 #include "thash.h"
 #include "tbuffer.h"
 #include "parserInt.h"
+#include "parserUtil.h"
+#include "tmsgtype.h"
 #include "queryInfoUtil.h"
 #include "function.h"
 
@@ -1632,7 +1633,7 @@ uint32_t convertRelationalOperator(SToken *pToken) {
   }
 }
 
-bool isDdlSql(SSqlInfo* pSqlInfo) {
+bool isDclSqlStatement(SSqlInfo* pSqlInfo) {
   return (pSqlInfo->type != TSDB_SQL_SELECT);
 }
 

source/libs/parser/test/parserTests.cpp

@@ -714,16 +714,14 @@ TEST(testCase, show_user_Test) {
   SSqlInfo info1 = doGenerateAST(sql1);
   ASSERT_EQ(info1.valid, true);
 
+  void* output = NULL;
+  int32_t type = 0;
+  int32_t len = 0;
+  int32_t code = qParserValidateDclSqlNode(&info1, 1, &output, &len, &type, msg, buf.len);
+  ASSERT_EQ(code, 0);
+
   // convert the show command to be the select query
   // select name, privilege, create_time, account from information_schema.users;
-
-
-  SQueryStmtInfo* pQueryInfo = createQueryInfo();
-//  setTableMetaInfo(pQueryInfo, &req);
-
-//  SSqlNode* pSqlNode = (SSqlNode*)taosArrayGetP(info1.sub.node, 0);
-//  ret = validateSqlNode(pSqlNode, pQueryInfo, &buf);
-//  ASSERT_NE(ret, 0);
 }
 
 TEST(testCase, create_user_Test) {
@@ -737,12 +735,12 @@ TEST(testCase, create_user_Test) {
   SSqlInfo info1 = doGenerateAST(sql);
   ASSERT_EQ(info1.valid, true);
 
-  ASSERT_EQ(isDdlSql(&info1), true);
+  ASSERT_EQ(isDclSqlStatement(&info1), true);
 
   void* output = NULL;
   int32_t type = 0;
-
-  int32_t code = qParserValidateDdlSqlNode(&info1, 1, &output, &type, msg, buf.len);
+  int32_t len = 0;
+  int32_t code = qParserValidateDclSqlNode(&info1, 1, &output, &len, &type, msg, buf.len);
   ASSERT_EQ(code, 0);
 
   destroySqlInfo(&info1);