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ndb Updated example 


ndb/examples/ndbapi_scan_example/ndbapi_scan.cpp:
  Updated example
ndb/include/ndbapi/NdbScanFilter.hpp:
  Fix default value
parent 52722f1b
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Showing with 182 additions and 208 deletions
ndb/examples/ndbapi_scan_example/ndbapi_scan.cpp
View file @ fa7b260a
......@@ -30,15 +30,19 @@
* getDictionary()
* startTransaction()
* closeTransaction()
* sendPreparedTransactions()
* pollNdb()
*
* NdbConnection
* getNdbOperation()
* executeAsynchPrepare()
* getNdbError()
* executeScan()
* nextScanResult()
* NdbTransaction
* getNdbScanOperation()
* execute()
*
* NdbResultSet
*
* NdbScanOperation
* getValue()
* readTuples()
* nextResult()
* deleteCurrentTuple()
* updateCurrentTuple()
*
* NdbDictionary::Dictionary
* getTable()
......@@ -60,33 +64,15 @@
* insertTuple()
* equal()
* setValue()
* openScanRead()
* openScanExclusive()
*
* NdbRecAttr
* aRef()
* u_32_value()
*
* NdbResultSet
* nextResult()
* deleteTuple()
* updateTuple()
*
* NdbScanOperation
* getValue()
* readTuplesExclusive()
*
* NdbScanFilter
* begin()
* eq()
* end()
*
*
*/
#include <ndb_global.h>
#include <NdbApi.hpp>
#include <NdbScanFilter.hpp>
// Used for cout
......@@ -114,30 +100,12 @@ milliSleep(int milliseconds){
<< error.code << ", msg: " << error.message << "." << std::endl; \
exit(-1); }
/*
* callback : This is called when the transaction is polled
*
* (This function must have three arguments:
* - The result of the transaction,
* - The NdbConnection object, and
* - A pointer to an arbitrary object.)
*/
static void
callback(int result, NdbConnection* myTrans, void* aObject)
struct Car
{
if (result == -1) {
std::cout << "In callback: " << std::endl;
/**
* Put error checking code here (see ndb_async_example)
*/
APIERROR(myTrans->getNdbError());
} else {
/**
* Ok!
*/
return;
}
}
unsigned int reg_no;
char brand[20];
char color[20];
};
/**
* Function to create table
......@@ -162,6 +130,8 @@ int create_table(Ndb * myNdb)
}
}
Car car;
myTable.setName("GARAGE");
myColumn.setName("REG_NO");
......@@ -173,7 +143,7 @@ int create_table(Ndb * myNdb)
myColumn.setName("BRAND");
myColumn.setType(NdbDictionary::Column::Char);
myColumn.setLength(20);
myColumn.setLength(sizeof(car.brand));
myColumn.setPrimaryKey(false);
myColumn.setNullable(false);
myTable.addColumn(myColumn);
......@@ -181,7 +151,7 @@ int create_table(Ndb * myNdb)
myColumn.setName("COLOR");
myColumn.setType(NdbDictionary::Column::Char);
myColumn.setLength(20);
myColumn.setLength(sizeof(car.color));
myColumn.setPrimaryKey(false);
myColumn.setNullable(false);
myTable.addColumn(myColumn);
......@@ -196,91 +166,64 @@ int create_table(Ndb * myNdb)
int populate(Ndb * myNdb)
{
NdbConnection* myNdbConnection[15]; // For transactions
NdbOperation* myNdbOperation; // For operations
/******************************************************
* Insert (we do 15 insert transactions in parallel) *
******************************************************/
int i;
Car cars[15];
/**
* Five blue mercedes
*/
for (int i = 0; i < 5; i++)
for (i = 0; i < 5; i++)
{
myNdbConnection[i] = myNdb->startTransaction();
if (myNdbConnection[i] == NULL)
APIERROR(myNdb->getNdbError());
myNdbOperation = myNdbConnection[i]->getNdbOperation("GARAGE");
// Error check. If error, then maybe table GARAGE is not in database
if (myNdbOperation == NULL)
APIERROR(myNdbConnection[i]->getNdbError());
myNdbOperation->insertTuple();
myNdbOperation->equal("REG_NO", i);
myNdbOperation->setValue("BRAND", "Mercedes");
myNdbOperation->setValue("COLOR", "Blue");
// Prepare transaction (the transaction is NOT yet sent to NDB)
myNdbConnection[i]->executeAsynchPrepare(Commit, &callback, NULL);
cars[i].reg_no = i;
sprintf(cars[i].brand, "Mercedes");
sprintf(cars[i].color, "Blue");
}
/**
* Five black bmw
*/
for (int i = 5; i < 10; i++)
for (i = 5; i < 10; i++)
{
myNdbConnection[i] = myNdb->startTransaction();
if (myNdbConnection[i] == NULL)
APIERROR(myNdb->getNdbError());
myNdbOperation = myNdbConnection[i]->getNdbOperation("GARAGE");
// Error check. If error, then maybe table MYTABLENAME is not in database
if (myNdbOperation == NULL)
APIERROR(myNdbConnection[i]->getNdbError());
myNdbOperation->insertTuple();
myNdbOperation->equal("REG_NO", i);
myNdbOperation->setValue("BRAND", "BMW");
myNdbOperation->setValue("COLOR", "Black");
// Prepare transaction (the transaction is NOT yet sent to NDB)
myNdbConnection[i]->executeAsynchPrepare(Commit, &callback, NULL);
cars[i].reg_no = i;
sprintf(cars[i].brand, "BMW");
sprintf(cars[i].color, "Black");
}
/**
* Five pink toyotas
*/
for (int i = 10; i < 15; i++) {
myNdbConnection[i] = myNdb->startTransaction();
if (myNdbConnection[i] == NULL) APIERROR(myNdb->getNdbError());
myNdbOperation = myNdbConnection[i]->getNdbOperation("GARAGE");
for (i = 10; i < 15; i++)
{
cars[i].reg_no = i;
sprintf(cars[i].brand, "Toyota");
sprintf(cars[i].color, "Pink");
}
NdbTransaction* myTrans = myNdb->startTransaction();
if (myTrans == NULL)
APIERROR(myNdb->getNdbError());
for (i = 0; i < 15; i++)
{
NdbOperation* myNdbOperation = myTrans->getNdbOperation("GARAGE");
// Error check. If error, then maybe table MYTABLENAME is not in database
if (myNdbOperation == NULL) APIERROR(myNdbConnection[i]->getNdbError());
if (myNdbOperation == NULL)
APIERROR(myTrans->getNdbError());
myNdbOperation->insertTuple();
myNdbOperation->equal("REG_NO", i);
myNdbOperation->setValue("BRAND", "Toyota");
myNdbOperation->setValue("COLOR", "Pink");
// Prepare transaction (the transaction is NOT yet sent to NDB)
myNdbConnection[i]->executeAsynchPrepare(Commit, &callback, NULL);
}
// Send all transactions to NDB
myNdb->sendPreparedTransactions(0);
// Poll all transactions
myNdb->pollNdb(3000, 0);
// it is also possible to use sendPollNdb instead of
// myNdb->sendPreparedTransactions(0); and myNdb->pollNdb(3000, 15); above.
// myNdb->sendPollNdb(3000,0);
// Note! Neither sendPollNdb or pollNdb returs until all 15 callbacks have
// executed.
// Close all transactions. It is also possible to close transactions
// in the callback.
for (int i = 0; i < 15; i++)
myNdb->closeTransaction(myNdbConnection[i]);
return 1;
myNdbOperation->equal("REG_NO", cars[i].reg_no);
myNdbOperation->setValue("BRAND", cars[i].brand);
myNdbOperation->setValue("COLOR", cars[i].color);
}
int check = myTrans->execute(Commit);
myTrans->close();
return check != -1;
}
int scan_delete(Ndb* myNdb,
int parallelism,
int column,
int column_len,
const char * color)
{
......@@ -342,8 +285,8 @@ int scan_delete(Ndb* myNdb,
/**
* Define a result set for the scan.
*/
NdbResultSet * rs = myScanOp->readTuplesExclusive(parallelism);
if( rs == 0 ) {
if(myScanOp->readTuples(NdbOperation::LM_Exclusive) != 0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return -1;
......@@ -354,8 +297,8 @@ int scan_delete(Ndb* myNdb,
*/
NdbScanFilter filter(myScanOp) ;
if(filter.begin(NdbScanFilter::AND) < 0 ||
filter.eq(column, color, column_len, false) <0||
filter.end() <0)
filter.cmp(NdbScanFilter::COND_EQ, column, color) < 0 ||
filter.end() < 0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
......@@ -384,9 +327,11 @@ int scan_delete(Ndb* myNdb,
* start of loop: nextResult(true) means that "parallelism" number of
* rows are fetched from NDB and cached in NDBAPI
*/
while((check = rs->nextResult(true)) == 0){
do {
if (rs->deleteTuple() != 0){
while((check = myScanOp->nextResult(true)) == 0){
do
{
if (myScanOp->deleteCurrentTuple() != 0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return -1;
......@@ -398,21 +343,32 @@ int scan_delete(Ndb* myNdb,
* cached in the NDBAPI are modified before
* fetching more rows from NDB.
*/
} while((check = rs->nextResult(false)) == 0);
} while((check = myScanOp->nextResult(false)) == 0);
/**
* Commit when all cached tuple have been marked for deletion
*/
if(check != -1){
if(check != -1)
{
check = myTrans->execute(Commit);
myTrans->releaseCompletedOperations();
}
if(check == -1)
{
/**
* Create a new transaction, while keeping scan open
*/
check = myTrans->restart();
}
/**
* Check for errors
*/
err = myTrans->getNdbError();
if(check == -1){
if(err.status == NdbError::TemporaryError){
if(check == -1)
{
if(err.status == NdbError::TemporaryError)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
milliSleep(50);
......@@ -426,10 +382,10 @@ int scan_delete(Ndb* myNdb,
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return 0;
}
if(myTrans!=0) {
if(myTrans!=0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
}
......@@ -438,10 +394,7 @@ int scan_delete(Ndb* myNdb,
int scan_update(Ndb* myNdb,
int parallelism,
int column_len,
int update_column,
const char * column_name,
const char * before_color,
const char * after_color)
......@@ -505,8 +458,8 @@ int scan_update(Ndb* myNdb,
/**
* Define a result set for the scan.
*/
NdbResultSet * rs = myScanOp->readTuplesExclusive(parallelism);
if( rs == 0 ) {
if( myScanOp->readTuplesExclusive(NdbOperation::LM_Exclusive) )
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return -1;
......@@ -517,7 +470,7 @@ int scan_update(Ndb* myNdb,
*/
NdbScanFilter filter(myScanOp) ;
if(filter.begin(NdbScanFilter::AND) < 0 ||
filter.eq(update_column, before_color, column_len, false) <0||
filter.cmp(NdbScanFilter::COND_EQ, update_column, before_color) <0||
filter.end() <0)
{
std::cout << myTrans->getNdbError().message << std::endl;
......@@ -528,7 +481,8 @@ int scan_update(Ndb* myNdb,
/**
* Start scan (NoCommit since we are only reading at this stage);
*/
if(myTrans->execute(NoCommit) != 0){
if(myTrans->execute(NoCommit) != 0)
{
err = myTrans->getNdbError();
if(err.status == NdbError::TemporaryError){
std::cout << myTrans->getNdbError().message << std::endl;
......@@ -541,49 +495,49 @@ int scan_update(Ndb* myNdb,
return -1;
}
/**
* Define an update operation
*/
NdbOperation * myUpdateOp;
/**
* start of loop: nextResult(true) means that "parallelism" number of
* rows are fetched from NDB and cached in NDBAPI
*/
while((check = rs->nextResult(true)) == 0){
while((check = myScanOp->nextResult(true)) == 0){
do {
/**
* Get update operation
*/
myUpdateOp = rs->updateTuple();
if (myUpdateOp == 0){
NdbOperation * myUpdateOp = myScanOp->updateCurrentTuple();
if (myUpdateOp == 0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return -1;
}
updatedRows++;
/**
* do the update
*/
myUpdateOp->setValue(update_column,after_color);
myUpdateOp->setValue(update_column, after_color);
/**
* nextResult(false) means that the records
* cached in the NDBAPI are modified before
* fetching more rows from NDB.
*/
} while((check = rs->nextResult(false)) == 0);
} while((check = myScanOp->nextResult(false)) == 0);
/**
* Commit when all cached tuple have been updated
* NoCommit when all cached tuple have been updated
*/
if(check != -1){
check = myTrans->execute(Commit);
myTrans->releaseCompletedOperations();
if(check != -1)
{
check = myTrans->execute(NoCommit);
}
/**
* Check for errors
*/
err = myTrans->getNdbError();
if(check == -1){
if(check == -1)
{
if(err.status == NdbError::TemporaryError){
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
......@@ -595,13 +549,28 @@ int scan_update(Ndb* myNdb,
* End of loop
*/
}
/**
* Commit all prepared operations
*/
if(myTrans->execute(Commit) == -1)
{
if(err.status == NdbError::TemporaryError){
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
milliSleep(50);
continue;
}
}
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return 0;
}
}
if(myTrans!=0) {
if(myTrans!=0)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
}
......@@ -610,9 +579,7 @@ int scan_update(Ndb* myNdb,
int scan_print(Ndb * myNdb, int parallelism,
int column_len_brand,
int column_len_color)
int scan_print(Ndb * myNdb)
{
// Scan all records exclusive and update
// them one by one
......@@ -674,10 +641,10 @@ int scan_print(Ndb * myNdb, int parallelism,
}
/**
* Define a result set for the scan.
* Read without locks, without being placed in lock queue
*/
NdbResultSet * rs = myScanOp->readTuplesExclusive(parallelism);
if( rs == 0 ) {
if( myScanOp->readTuples(NdbOperation::LM_CommittedRead) == -1)
{
std::cout << myTrans->getNdbError().message << std::endl;
myNdb->closeTransaction(myTrans);
return -1;
......@@ -719,7 +686,7 @@ int scan_print(Ndb * myNdb, int parallelism,
* start of loop: nextResult(true) means that "parallelism" number of
* rows are fetched from NDB and cached in NDBAPI
*/
while((check = rs->nextResult(true)) == 0){
while((check = myScanOp->nextResult(true)) == 0){
do {
fetchedRows++;
......@@ -727,28 +694,23 @@ int scan_print(Ndb * myNdb, int parallelism,
* print REG_NO unsigned int
*/
std::cout << myRecAttr[0]->u_32_value() << "\t";
char * buf_brand = new char[column_len_brand+1];
char * buf_color = new char[column_len_color+1];
/**
* print BRAND character string
*/
memcpy(buf_brand, myRecAttr[1]->aRef(), column_len_brand);
buf_brand[column_len_brand] = 0;
std::cout << buf_brand << "\t";
delete [] buf_brand;
std::cout << myRecAttr[1]->aRef() << "\t";
/**
* print COLOR character string
*/
memcpy(buf_color, myRecAttr[2]->aRef(), column_len_color);
buf_brand[column_len_color] = 0;
std::cout << buf_color << std::endl;
delete [] buf_color;
std::cout << myRecAttr[2]->aRef() << std::endl;
/**
* nextResult(false) means that the records
* cached in the NDBAPI are modified before
* fetching more rows from NDB.
*/
} while((check = rs->nextResult(false)) == 0);
} while((check = myScanOp->nextResult(false)) == 0);
}
myNdb->closeTransaction(myTrans);
......@@ -762,55 +724,67 @@ int scan_print(Ndb * myNdb, int parallelism,
int main()
{
ndb_init();
Ndb* myNdb = new Ndb( "TEST_DB" ); // Object representing the database
Ndb_cluster_connection cluster_connection;
if (cluster_connection.connect(12, 5, 1))
{
std::cout << "Unable to connect to cluster within 30 secs." << std::endl;
exit(-1);
}
if (cluster_connection.wait_until_ready(30,30))
{
std::cout << "Cluster was not ready within 30 secs." << std::endl;
exit(-1);
}
Ndb myNdb(&cluster_connection,"TEST_DB" );
/*******************************************
* Initialize NDB and wait until its ready *
*******************************************/
if (myNdb->init(1024) == -1) { // Set max 1024 parallel transactions
APIERROR(myNdb->getNdbError());
if (myNdb.init(1024) == -1) { // Set max 1024 parallel transactions
APIERROR(myNdb.getNdbError());
exit(-1);
}
if (myNdb->waitUntilReady(30) != 0) {
std::cout << "NDB was not ready within 30 secs." << std::endl;
exit(-1);
}
create_table(myNdb);
create_table(&myNdb);
NdbDictionary::Dictionary* myDict = myNdb->getDictionary();
NdbDictionary::Dictionary* myDict = myNdb.getDictionary();
int column_color = myDict->getTable("GARAGE")->getColumn("COLOR")->getColumnNo();
int column_len_color =
myDict->getTable("GARAGE")->getColumn("COLOR")->getLength();
int column_len_brand =
myDict->getTable("GARAGE")->getColumn("BRAND")->getLength();
int parallelism = 16;
if(populate(myNdb) > 0)
if(populate(&myNdb) > 0)
std::cout << "populate: Success!" << std::endl;
if(scan_print(myNdb, parallelism, column_len_brand, column_len_color) > 0)
if(scan_print(&myNdb) > 0)
std::cout << "scan_print: Success!" << std::endl << std::endl;
std::cout << "Going to delete all pink cars!" << std::endl;
if(scan_delete(myNdb, parallelism, column_color,
column_len_color, "Pink") > 0)
{
/**
* Note! color needs to be of exact the same size as column defined
*/
char color[20] = "Pink";
if(scan_delete(&myNdb, column_color, color) > 0)
std::cout << "scan_delete: Success!" << std::endl << std::endl;
}
if(scan_print(myNdb, parallelism, column_len_brand, column_len_color) > 0)
if(scan_print(&myNdb) > 0)
std::cout << "scan_print: Success!" << std::endl << std::endl;
std::cout << "Going to update all blue cars to black cars!" << std::endl;
if(scan_update(myNdb, parallelism, column_len_color, column_color,
"COLOR", "Blue", "Black") > 0)
{
/**
* Note! color1 & 2 need to be of exact the same size as column defined
*/
char color1[20] = "Blue";
char color2[20] = "Black";
std::cout << "Going to update all " << color1
<< " cars to " << color2 << " cars!" << std::endl;
if(scan_update(&myNdb, column_color, color1, color2) > 0)
std::cout << "scan_update: Success!" << std::endl << std::endl;
}
if(scan_print(myNdb, parallelism, column_len_brand, column_len_color) > 0)
if(scan_print(&myNdb) > 0)
std::cout << "scan_print: Success!" << std::endl << std::endl;
delete myNdb;
}
ndb/include/ndbapi/NdbScanFilter.hpp
View file @ fa7b260a
......@@ -88,7 +88,7 @@ public:
/**
* Compare column <b>ColId</b> with <b>val</b>
*/
int cmp(BinaryCondition cond, int ColId, const void *val, Uint32 len);
int cmp(BinaryCondition cond, int ColId, const void *val, Uint32 len = 0);
/**
* @name Integer Comparators
......
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