Change Batch API to be consistent with Query()

Exec() method for batch was added & Query() method was refactored.
Batch for now behaves the same way as query.

patch by Oleksandr Luzhniy; reviewed by João Reis, Danylo Savchenko, Bohdan Siryk, Jackson Fleming, for CASSGO-7

Author: tengu-alt

CHANGELOG.md

@@ -16,6 +16,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Detailed description for NumConns (CASSGO-3)
 
+- Change Batch API to be consistent with Query() (CASSGO-7)
+
 ### Fixed
 
 - Retry policy now takes into account query idempotency (CASSGO-27)

batch_test.go

@@ -47,9 +47,9 @@ func TestBatch_Errors(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	b := session.NewBatch(LoggedBatch)
-	b.Query("SELECT * FROM batch_errors WHERE id=2 AND val=?", nil)
-	if err := session.ExecuteBatch(b); err == nil {
+	b := session.Batch(LoggedBatch)
+	b = b.Query("SELECT * FROM gocql_test.batch_errors WHERE id=2 AND val=?", nil)
+	if err := b.Exec(); err == nil {
 		t.Fatal("expected to get error for invalid query in batch")
 	}
 }
@@ -68,15 +68,17 @@ func TestBatch_WithTimestamp(t *testing.T) {
 
 	micros := time.Now().UnixNano()/1e3 - 1000
 
-	b := session.NewBatch(LoggedBatch)
+	b := session.Batch(LoggedBatch)
 	b.WithTimestamp(micros)
-	b.Query("INSERT INTO batch_ts (id, val) VALUES (?, ?)", 1, "val")
-	if err := session.ExecuteBatch(b); err != nil {
+	b = b.Query("INSERT INTO gocql_test.batch_ts (id, val) VALUES (?, ?)", 1, "val")
+	b = b.Query("INSERT INTO gocql_test.batch_ts (id, val) VALUES (?, ?)", 2, "val")
+
+	if err := b.Exec(); err != nil {
 		t.Fatal(err)
 	}
 
 	var storedTs int64
-	if err := session.Query(`SELECT writetime(val) FROM batch_ts WHERE id = ?`, 1).Scan(&storedTs); err != nil {
+	if err := session.Query(`SELECT writetime(val) FROM gocql_test.batch_ts WHERE id = ?`, 1).Scan(&storedTs); err != nil {
 		t.Fatal(err)
 	}
 

cassandra_test.go

@@ -45,7 +45,7 @@ import (
 	"time"
 	"unicode"
 
-	inf "gopkg.in/inf.v0"
+	"gopkg.in/inf.v0"
 )
 
 func TestEmptyHosts(t *testing.T) {
@@ -454,15 +454,15 @@ func TestCAS(t *testing.T) {
 		t.Fatal("truncate:", err)
 	}
 
-	successBatch := session.NewBatch(LoggedBatch)
+	successBatch := session.Batch(LoggedBatch)
 	successBatch.Query("INSERT INTO cas_table (title, revid, last_modified) VALUES (?, ?, ?) IF NOT EXISTS", title, revid, modified)
 	if applied, _, err := session.ExecuteBatchCAS(successBatch, &titleCAS, &revidCAS, &modifiedCAS); err != nil {
 		t.Fatal("insert:", err)
 	} else if !applied {
 		t.Fatalf("insert should have been applied: title=%v revID=%v modified=%v", titleCAS, revidCAS, modifiedCAS)
 	}
 
-	successBatch = session.NewBatch(LoggedBatch)
+	successBatch = session.Batch(LoggedBatch)
 	successBatch.Query("INSERT INTO cas_table (title, revid, last_modified) VALUES (?, ?, ?) IF NOT EXISTS", title+"_foo", revid, modified)
 	casMap := make(map[string]interface{})
 	if applied, _, err := session.MapExecuteBatchCAS(successBatch, casMap); err != nil {
@@ -471,22 +471,22 @@ func TestCAS(t *testing.T) {
 		t.Fatal("insert should have been applied")
 	}
 
-	failBatch := session.NewBatch(LoggedBatch)
+	failBatch := session.Batch(LoggedBatch)
 	failBatch.Query("INSERT INTO cas_table (title, revid, last_modified) VALUES (?, ?, ?) IF NOT EXISTS", title, revid, modified)
 	if applied, _, err := session.ExecuteBatchCAS(successBatch, &titleCAS, &revidCAS, &modifiedCAS); err != nil {
 		t.Fatal("insert:", err)
 	} else if applied {
 		t.Fatalf("insert should have been applied: title=%v revID=%v modified=%v", titleCAS, revidCAS, modifiedCAS)
 	}
 
-	insertBatch := session.NewBatch(LoggedBatch)
+	insertBatch := session.Batch(LoggedBatch)
 	insertBatch.Query("INSERT INTO cas_table (title, revid, last_modified) VALUES ('_foo', 2c3af400-73a4-11e5-9381-29463d90c3f0, DATEOF(NOW()))")
 	insertBatch.Query("INSERT INTO cas_table (title, revid, last_modified) VALUES ('_foo', 3e4ad2f1-73a4-11e5-9381-29463d90c3f0, DATEOF(NOW()))")
 	if err := session.ExecuteBatch(insertBatch); err != nil {
 		t.Fatal("insert:", err)
 	}
 
-	failBatch = session.NewBatch(LoggedBatch)
+	failBatch = session.Batch(LoggedBatch)
 	failBatch.Query("UPDATE cas_table SET last_modified = DATEOF(NOW()) WHERE title='_foo' AND revid=2c3af400-73a4-11e5-9381-29463d90c3f0 IF last_modified=DATEOF(NOW());")
 	failBatch.Query("UPDATE cas_table SET last_modified = DATEOF(NOW()) WHERE title='_foo' AND revid=3e4ad2f1-73a4-11e5-9381-29463d90c3f0 IF last_modified=DATEOF(NOW());")
 	if applied, iter, err := session.ExecuteBatchCAS(failBatch, &titleCAS, &revidCAS, &modifiedCAS); err != nil {
@@ -611,7 +611,7 @@ func TestBatch(t *testing.T) {
 		t.Fatal("create table:", err)
 	}
 
-	batch := session.NewBatch(LoggedBatch)
+	batch := session.Batch(LoggedBatch)
 	for i := 0; i < 100; i++ {
 		batch.Query(`INSERT INTO batch_table (id) VALUES (?)`, i)
 	}
@@ -643,9 +643,9 @@ func TestUnpreparedBatch(t *testing.T) {
 
 	var batch *Batch
 	if session.cfg.ProtoVersion == 2 {
-		batch = session.NewBatch(CounterBatch)
+		batch = session.Batch(CounterBatch)
 	} else {
-		batch = session.NewBatch(UnloggedBatch)
+		batch = session.Batch(UnloggedBatch)
 	}
 
 	for i := 0; i < 100; i++ {
@@ -684,7 +684,7 @@ func TestBatchLimit(t *testing.T) {
 		t.Fatal("create table:", err)
 	}
 
-	batch := session.NewBatch(LoggedBatch)
+	batch := session.Batch(LoggedBatch)
 	for i := 0; i < 65537; i++ {
 		batch.Query(`INSERT INTO batch_table2 (id) VALUES (?)`, i)
 	}
@@ -738,7 +738,7 @@ func TestTooManyQueryArgs(t *testing.T) {
 		t.Fatal("'`SELECT * FROM too_many_query_args WHERE id = ?`, 1, 2' should return an error")
 	}
 
-	batch := session.NewBatch(UnloggedBatch)
+	batch := session.Batch(UnloggedBatch)
 	batch.Query("INSERT INTO too_many_query_args (id, value) VALUES (?, ?)", 1, 2, 3)
 	err = session.ExecuteBatch(batch)
 
@@ -770,7 +770,7 @@ func TestNotEnoughQueryArgs(t *testing.T) {
 		t.Fatal("'`SELECT * FROM not_enough_query_args WHERE id = ? and cluster = ?`, 1' should return an error")
 	}
 
-	batch := session.NewBatch(UnloggedBatch)
+	batch := session.Batch(UnloggedBatch)
 	batch.Query("INSERT INTO not_enough_query_args (id, cluster, value) VALUES (?, ?, ?)", 1, 2)
 	err = session.ExecuteBatch(batch)
 
@@ -1392,7 +1392,7 @@ func TestBatchQueryInfo(t *testing.T) {
 		return values, nil
 	}
 
-	batch := session.NewBatch(LoggedBatch)
+	batch := session.Batch(LoggedBatch)
 	batch.Bind("INSERT INTO batch_query_info (id, cluster, value) VALUES (?, ?,?)", write)
 
 	if err := session.ExecuteBatch(batch); err != nil {
@@ -1520,7 +1520,7 @@ func TestPrepare_ReprepareBatch(t *testing.T) {
 	}
 
 	stmt, conn := injectInvalidPreparedStatement(t, session, "test_reprepare_statement_batch")
-	batch := session.NewBatch(UnloggedBatch)
+	batch := session.Batch(UnloggedBatch)
 	batch.Query(stmt, "bar")
 	if err := conn.executeBatch(ctx, batch).Close(); err != nil {
 		t.Fatalf("Failed to execute query for reprepare statement: %v", err)
@@ -1904,7 +1904,7 @@ func TestBatchStats(t *testing.T) {
 		t.Fatalf("failed to create table with error '%v'", err)
 	}
 
-	b := session.NewBatch(LoggedBatch)
+	b := session.Batch(LoggedBatch)
 	b.Query("INSERT INTO batchStats (id) VALUES (?)", 1)
 	b.Query("INSERT INTO batchStats (id) VALUES (?)", 2)
 
@@ -1947,7 +1947,7 @@ func TestBatchObserve(t *testing.T) {
 
 	var observedBatch *observation
 
-	batch := session.NewBatch(LoggedBatch)
+	batch := session.Batch(LoggedBatch)
 	batch.Observer(funcBatchObserver(func(ctx context.Context, o ObservedBatch) {
 		if observedBatch != nil {
 			t.Fatal("batch observe called more than once")
@@ -3286,7 +3286,7 @@ func TestUnsetColBatch(t *testing.T) {
 		t.Fatalf("failed to create table with error '%v'", err)
 	}
 
-	b := session.NewBatch(LoggedBatch)
+	b := session.Batch(LoggedBatch)
 	b.Query("INSERT INTO gocql_test.batchUnsetInsert(id, my_int, my_text) VALUES (?,?,?)", 1, 1, UnsetValue)
 	b.Query("INSERT INTO gocql_test.batchUnsetInsert(id, my_int, my_text) VALUES (?,?,?)", 1, UnsetValue, "")
 	b.Query("INSERT INTO gocql_test.batchUnsetInsert(id, my_int, my_text) VALUES (?,?,?)", 2, 2, UnsetValue)

doc.go

@@ -310,7 +310,7 @@
 // # Batches
 //
 // The CQL protocol supports sending batches of DML statements (INSERT/UPDATE/DELETE) and so does gocql.
-// Use Session.NewBatch to create a new batch and then fill-in details of individual queries.
+// Use Session.Batch to create a new batch and then fill-in details of individual queries.
 // Then execute the batch with Session.ExecuteBatch.
 //
 // Logged batches ensure atomicity, either all or none of the operations in the batch will succeed, but they have

example_batch_test.go

@@ -29,7 +29,7 @@ import (
 	"fmt"
 	"log"
 
-	gocql "github.com/gocql/gocql"
+	"github.com/gocql/gocql"
 )
 
 // Example_batch demonstrates how to execute a batch of statements.
@@ -49,7 +49,7 @@ func Example_batch() {
 
 	ctx := context.Background()
 
-	b := session.NewBatch(gocql.UnloggedBatch).WithContext(ctx)
+	b := session.Batch(gocql.UnloggedBatch).WithContext(ctx)
 	b.Entries = append(b.Entries, gocql.BatchEntry{
 		Stmt:       "INSERT INTO example.batches (pk, ck, description) VALUES (?, ?, ?)",
 		Args:       []interface{}{1, 2, "1.2"},
@@ -60,11 +60,19 @@ func Example_batch() {
 		Args:       []interface{}{1, 3, "1.3"},
 		Idempotent: true,
 	})
+
 	err = session.ExecuteBatch(b)
 	if err != nil {
 		log.Fatal(err)
 	}
 
+	err = b.Query("INSERT INTO example.batches (pk, ck, description) VALUES (?, ?, ?)", 1, 4, "1.4").
+		Query("INSERT INTO example.batches (pk, ck, description) VALUES (?, ?, ?)", 1, 5, "1.5").
+		Exec()
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	scanner := session.Query("SELECT pk, ck, description FROM example.batches").Iter().Scanner()
 	for scanner.Next() {
 		var pk, ck int32
@@ -77,4 +85,6 @@ func Example_batch() {
 	}
 	// 1 2 1.2
 	// 1 3 1.3
+	// 1 4 1.4
+	// 1 5 1.5
 }

example_lwt_batch_test.go

@@ -29,7 +29,7 @@ import (
 	"fmt"
 	"log"
 
-	gocql "github.com/gocql/gocql"
+	"github.com/gocql/gocql"
 )
 
 // ExampleSession_MapExecuteBatchCAS demonstrates how to execute a batch lightweight transaction.
@@ -62,7 +62,7 @@ func ExampleSession_MapExecuteBatchCAS() {
 	}
 
 	executeBatch := func(ck2Version int) {
-		b := session.NewBatch(gocql.LoggedBatch)
+		b := session.Batch(gocql.LoggedBatch)
 		b.Entries = append(b.Entries, gocql.BatchEntry{
 			Stmt: "UPDATE my_lwt_batch_table SET value=? WHERE pk=? AND ck=? IF version=?",
 			Args: []interface{}{"b", "pk1", "ck1", 1},

integration_test.go

@@ -218,7 +218,7 @@ func TestCustomPayloadMessages(t *testing.T) {
 	iter.Close()
 
 	// Batch Message
-	b := session.NewBatch(LoggedBatch)
+	b := session.Batch(LoggedBatch)
 	b.CustomPayload = customPayload
 	b.Query("INSERT INTO testCustomPayloadMessages(id,value) VALUES(1, 1)")
 	if err := session.ExecuteBatch(b); err != nil {

session.go

@@ -731,6 +731,13 @@ func (b *Batch) execute(ctx context.Context, conn *Conn) *Iter {
 	return conn.executeBatch(ctx, b)
 }
 
+// Exec executes a batch operation and returns nil if successful
+// otherwise an error is returned describing the failure.
+func (b *Batch) Exec() error {
+	iter := b.session.executeBatch(b)
+	return iter.Close()
+}
+
 func (s *Session) executeBatch(batch *Batch) *Iter {
 	// fail fast
 	if s.Closed() {
@@ -1748,7 +1755,14 @@ type Batch struct {
 }
 
 // NewBatch creates a new batch operation using defaults defined in the cluster
+//
+// Deprecated: use session.Batch instead
 func (s *Session) NewBatch(typ BatchType) *Batch {
+	return s.Batch(typ)
+}
+
+// Batch creates a new batch operation using defaults defined in the cluster
+func (s *Session) Batch(typ BatchType) *Batch {
 	s.mu.RLock()
 	batch := &Batch{
 		Type:             typ,
@@ -1848,8 +1862,9 @@ func (b *Batch) SpeculativeExecutionPolicy(sp SpeculativeExecutionPolicy) *Batch
 }
 
 // Query adds the query to the batch operation
-func (b *Batch) Query(stmt string, args ...interface{}) {
+func (b *Batch) Query(stmt string, args ...interface{}) *Batch {
 	b.Entries = append(b.Entries, BatchEntry{Stmt: stmt, Args: args})
+	return b
 }
 
 // Bind adds the query to the batch operation and correlates it with a binding callback

session_test.go

@@ -96,7 +96,7 @@ func TestSessionAPI(t *testing.T) {
 		t.Fatalf("expected itr.err to be '%v', got '%v'", ErrNoConnections, itr.err)
 	}
 
-	testBatch := s.NewBatch(LoggedBatch)
+	testBatch := s.Batch(LoggedBatch)
 	testBatch.Query("test")
 	err := s.ExecuteBatch(testBatch)
 
@@ -219,15 +219,15 @@ func TestBatchBasicAPI(t *testing.T) {
 	s.pool = cfg.PoolConfig.buildPool(s)
 
 	// Test UnloggedBatch
-	b := s.NewBatch(UnloggedBatch)
+	b := s.Batch(UnloggedBatch)
 	if b.Type != UnloggedBatch {
 		t.Fatalf("expceted batch.Type to be '%v', got '%v'", UnloggedBatch, b.Type)
 	} else if b.rt != cfg.RetryPolicy {
 		t.Fatalf("expceted batch.RetryPolicy to be '%v', got '%v'", cfg.RetryPolicy, b.rt)
 	}
 
 	// Test LoggedBatch
-	b = s.NewBatch(LoggedBatch)
+	b = s.Batch(LoggedBatch)
 	if b.Type != LoggedBatch {
 		t.Fatalf("expected batch.Type to be '%v', got '%v'", LoggedBatch, b.Type)
 	}