Add SendBatch to pool

conn.go

@@ -683,7 +683,7 @@ func (c *Conn) QueryRow(ctx context.Context, sql string, args ...interface{}) Ro
 
 // SendBatch sends all queued queries to the server at once. All queries are run in an implicit transaction unless
 // explicit transaction control statements are executed.
-func (c *Conn) SendBatch(ctx context.Context, b *Batch) *BatchResults {
+func (c *Conn) SendBatch(ctx context.Context, b *Batch) BatchResults {
 	batch := &pgconn.Batch{}
 
 	for _, bi := range b.items {
@@ -698,7 +698,7 @@ func (c *Conn) SendBatch(ctx context.Context, b *Batch) *BatchResults {
 
 		args, err := convertDriverValuers(bi.arguments)
 		if err != nil {
-			return &BatchResults{err: err}
+			return &batchResults{err: err}
 		}
 
 		paramFormats := make([]int16, len(args))
@@ -707,7 +707,7 @@ func (c *Conn) SendBatch(ctx context.Context, b *Batch) *BatchResults {
 			paramFormats[i] = chooseParameterFormatCode(c.ConnInfo, parameterOIDs[i], args[i])
 			paramValues[i], err = newencodePreparedStatementArgument(c.ConnInfo, parameterOIDs[i], args[i])
 			if err != nil {
-				return &BatchResults{err: err}
+				return &batchResults{err: err}
 			}
 
 		}
@@ -739,7 +739,7 @@ func (c *Conn) SendBatch(ctx context.Context, b *Batch) *BatchResults {
 
 	mrr := c.pgConn.ExecBatch(ctx, batch)
 
-	return &BatchResults{
+	return &batchResults{
 		conn: c,
 		mrr:  mrr,
 	}