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statement.go
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statement.go
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package driver
import (
"context"
"database/sql/driver"
"errors"
"cloud.google.com/go/bigquery"
"github.com/sirupsen/logrus"
"github.com/scaledata/bigquery/adaptor"
)
type bigQueryStatement struct {
connection *bigQueryConnection
query string
}
func (statement bigQueryStatement) Close() error {
return nil
}
func (statement bigQueryStatement) NumInput() int {
return 0
}
func (bigQueryStatement) CheckNamedValue(*driver.NamedValue) error {
return nil
}
func (statement *bigQueryStatement) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
logrus.Debugf("exec:%s", statement.query)
if logrus.IsLevelEnabled(logrus.DebugLevel) {
for _, arg := range args {
logrus.Debugf("- param:%s", convertParameterToValue(arg))
}
}
query, err := statement.buildQuery(convertParameters(args))
if err != nil {
return nil, err
}
rowIterator, err := query.Read(ctx)
if err != nil {
return nil, err
}
return &bigQueryResult{rowIterator}, nil
}
func (statement *bigQueryStatement) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
logrus.Debugf("query:%s", statement.query)
if logrus.IsLevelEnabled(logrus.DebugLevel) {
for _, arg := range args {
logrus.Debugf("- param:%s", convertParameterToValue(arg))
}
}
if statement.query == adaptor.RerouteQuery {
if len(args) < 1 {
return nil, errors.New("expected a rerouting argument")
}
column, ok := args[0].Value.(bigQueryReroutedColumn)
if !ok {
return nil, errors.New("expected a rerouting argument with rows")
}
schemaAdaptor := adaptor.GetSchemaAdaptor(ctx)
if schemaAdaptor == nil {
return nil, errors.New("expected a rerouting schema adaptor")
}
schema := createBigQuerySchema(column.schema, schemaAdaptor)
return &bigQueryRows{
source: createSourceFromColumn(schema, column.values),
}, nil
}
query, err := statement.buildQuery(convertParameters(args))
if err != nil {
return nil, err
}
rowIterator, err := query.Read(context.Background())
if err != nil {
return nil, err
}
return &bigQueryRows{
source: createSourceFromRowIterator(rowIterator, adaptor.GetSchemaAdaptor(ctx)),
}, nil
}
func (statement bigQueryStatement) Exec(args []driver.Value) (driver.Result, error) {
logrus.Debugf("exec:%s", statement.query)
if logrus.IsLevelEnabled(logrus.DebugLevel) {
for _, arg := range args {
logrus.Debugf("- param:%s", convertParameterToValue(arg))
}
}
query, err := statement.buildQuery(args)
if err != nil {
return nil, err
}
rowIterator, err := query.Read(context.Background())
if err != nil {
return nil, err
}
return &bigQueryResult{rowIterator}, nil
}
func (statement bigQueryStatement) Query(args []driver.Value) (driver.Rows, error) {
logrus.Debugf("query:%s", statement.query)
if logrus.IsLevelEnabled(logrus.DebugLevel) {
for _, arg := range args {
logrus.Debugf("- param:%s", convertParameterToValue(arg))
}
}
query, err := statement.buildQuery(args)
if err != nil {
return nil, err
}
rowIterator, err := query.Read(context.Background())
if err != nil {
return nil, err
}
return &bigQueryRows{source: createSourceFromRowIterator(rowIterator, nil)}, nil
}
func (statement bigQueryStatement) buildQuery(args []driver.Value) (*bigquery.Query, error) {
query, err := statement.connection.query(statement.query)
if err != nil {
return nil, err
}
query.DefaultDatasetID = statement.connection.config.dataSet
query.Parameters, err = statement.buildParameters(args)
if err != nil {
return nil, err
}
return query, err
}
func (statement bigQueryStatement) buildParameters(args []driver.Value) ([]bigquery.QueryParameter, error) {
if args == nil {
return nil, nil
}
var parameters []bigquery.QueryParameter
for _, arg := range args {
parameters = buildParameter(arg, parameters)
}
return parameters, nil
}
func buildParameter(arg driver.Value, parameters []bigquery.QueryParameter) []bigquery.QueryParameter {
namedValue, ok := arg.(driver.NamedValue)
if ok {
return buildParameterFromNamedValue(namedValue, parameters)
}
logrus.Debugf("-param:%s", arg)
return append(parameters, bigquery.QueryParameter{
Value: arg,
})
}
func buildParameterFromNamedValue(namedValue driver.NamedValue, parameters []bigquery.QueryParameter) []bigquery.QueryParameter {
logrus.Debugf("-param:%s=%s", namedValue.Name, namedValue.Value)
if namedValue.Name == "" {
return append(parameters, bigquery.QueryParameter{
Value: namedValue.Value,
})
} else {
return append(parameters, bigquery.QueryParameter{
Name: namedValue.Name,
Value: namedValue.Value,
})
}
}
func convertParameters(args []driver.NamedValue) []driver.Value {
var values []driver.Value
if args != nil {
for _, arg := range args {
values = append(values, arg)
}
}
return values
}
func convertParameterToValue(value driver.Value) interface{} {
namedValue, ok := value.(driver.NamedValue)
if ok {
return namedValue.Value
}
return value
}