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sql.go
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sql.go
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package backends
import (
"context"
"database/sql"
"fmt"
"reflect"
"strings"
"sync"
"time"
"unicode"
"github.com/ghetzel/go-stockutil/log"
"github.com/ghetzel/go-stockutil/maputil"
"github.com/ghetzel/go-stockutil/sliceutil"
"github.com/ghetzel/go-stockutil/typeutil"
"github.com/ghetzel/pivot/v3/dal"
"github.com/ghetzel/pivot/v3/filter"
"github.com/ghetzel/pivot/v3/filter/generators"
"github.com/ghetzel/pivot/v3/util"
)
var SqlObjectFieldHintLength = 131071
var SqlArrayFieldHintLength = 131069
var InitialPingTimeout = time.Duration(10) * time.Second
var sqlMaxExactCountRows = 10000
type SqlPreInitFunc func(*SqlBackend)
type SqlInitFunc func(*SqlBackend) (string, string, error)
var sqlPreInitFuncs = make(map[string]SqlPreInitFunc)
var sqlInitFuncs = make(map[string]SqlInitFunc)
func RegisterSqlPreInitFunc(scheme string, fn SqlPreInitFunc) {
if fn != nil {
sqlPreInitFuncs[scheme] = fn
}
}
func RegisterSqlInitFunc(scheme string, fn SqlInitFunc) {
if fn != nil {
sqlInitFuncs[scheme] = fn
}
}
func init() {
// setup scheme aliases (e.g.: psql:// -> postgresql://)
dal.AddConnectionSchemeAlias(`psql`, `postgresql`)
dal.AddConnectionSchemeAlias(`postgres`, `postgresql`)
// setup (optional) pre-initializers
RegisterSqlPreInitFunc(`mysql`, preinitializeMysql)
RegisterSqlPreInitFunc(`sqlite`, preinitializeSqlite)
RegisterSqlPreInitFunc(`postgresql`, preinitializePostgres)
// setup *required* initializers
RegisterSqlInitFunc(`mysql`, initializeMysql)
RegisterSqlInitFunc(`sqlite`, initializeSqlite)
RegisterSqlInitFunc(`postgresql`, initializePostgres)
util.DisableFeature(`sql-migrate`)
}
type sqlTableDetails struct {
Index int
Name string
Type string
TypeLength int
Precision int
NativeType string
PrimaryKey bool
KeyField bool
Nullable bool
Unique bool
DefaultValue string
}
type additionalIndexer struct {
ForCollection string
Indexer Indexer
}
type sqlTableDetailsFunc func(datasetName string, collectionName string) (*dal.Collection, error)
type SqlBackend struct {
Backend
Indexer
Aggregator
conn *dal.ConnectionString
db *sql.DB
indexer Indexer
aggregator map[string]Aggregator
queryGenTypeMapping generators.SqlTypeMapping
queryGenNormalizerFormat string
listAllTablesQuery string
createPrimaryKeyIntFormat string
createPrimaryKeyStrFormat string
showTableDetailQuery string
foreignKeyConstraintFormat string
defaultCurrentTimeString string
refreshCollectionFunc sqlTableDetailsFunc
countEstimateQuery string
countExactQuery string
dropTableQuery string
registeredCollections sync.Map
knownCollections map[string]bool
detectedCollections map[string]*dal.Collection
initialized bool
}
func NewSqlBackend(connection dal.ConnectionString) Backend {
backend := &SqlBackend{
conn: &connection,
queryGenTypeMapping: generators.DefaultSqlTypeMapping,
dropTableQuery: `DROP TABLE %s`,
aggregator: make(map[string]Aggregator),
knownCollections: make(map[string]bool),
detectedCollections: make(map[string]*dal.Collection),
}
if fn, ok := sqlPreInitFuncs[connection.Backend()]; ok && fn != nil {
fn(backend)
}
backend.indexer = backend
return backend
}
func (self *SqlBackend) Supports(features ...BackendFeature) bool {
for _, feat := range features {
switch feat {
case Constraints:
return true
default:
return false
}
}
return true
}
func (self *SqlBackend) String() string {
return self.conn.Backend()
}
func (self *SqlBackend) GetConnectionString() *dal.ConnectionString {
return self.conn
}
func (self *SqlBackend) RegisterCollection(collection *dal.Collection) {
if collection != nil {
self.registeredCollections.Store(collection.Name, collection)
log.Debugf("[%v] register collection %v", self, collection.Name)
go self.updateEstimatedCountForTable(collection)
}
}
func (self *SqlBackend) updateEstimatedCountForTable(collection *dal.Collection) {
if !self.conn.OptBool(`autocount`, false) {
return
}
if collection != nil {
if approx := self.countEstimateQuery; approx != `` {
row := self.db.QueryRow(fmt.Sprintf(approx, collection.Name))
var count int
if err := row.Scan(&count); err == nil {
if count > sqlMaxExactCountRows {
collection.TotalRecords = int64(count)
if count > 0 {
log.Noticef("[%v] collection %v = %d record", self, collection.Name, collection.TotalRecords)
}
collection.TotalRecordsExact = false
return
}
} else {
log.Warningf("%v: error estimating count: %v", collection.Name, err)
}
if exact := self.countExactQuery; exact != `` {
row := self.db.QueryRow(fmt.Sprintf(exact, collection.Name, sqlMaxExactCountRows))
if err := row.Scan(&count); err == nil {
collection.TotalRecords = int64(count)
if count > 0 {
log.Noticef("[%v] collection %v = %d record", self, collection.Name, collection.TotalRecords)
}
collection.TotalRecordsExact = true
} else {
log.Warningf("%v: error counting: %v", collection.Name, err)
}
}
}
}
}
func (self *SqlBackend) SetIndexer(indexConnString dal.ConnectionString) error {
if indexer, err := MakeIndexer(indexConnString); err == nil {
if indexConnString.OptBool(`fallbackToBackend`, false) {
log.Debugf("Indexer fallback to backend %T", self)
multi := NewMultiIndex()
multi.AddIndexer(indexer)
multi.AddIndexer(self)
self.indexer = multi
} else {
self.indexer = indexer
}
return nil
} else {
return err
}
}
func (self *SqlBackend) Initialize() error {
backend := self.conn.Backend()
internalBackend := backend
var name string
var dsn string
var err error
// setup driver-specific settings
if fn, ok := sqlInitFuncs[self.conn.Backend()]; ok && fn != nil {
name, dsn, err = fn(self)
} else {
return fmt.Errorf("undefined or nil initializer function for SQL type %q", self.conn.Backend())
}
if err != nil {
return err
} else if name != `` {
internalBackend = name
}
// setup the database driver for use
if db, err := sql.Open(internalBackend, dsn); err == nil {
self.db = db
} else {
return err
}
// actually verify database connectivity at this time
if err := self.Ping(InitialPingTimeout); err != nil {
return err
}
// refresh schema cache
if err := self.refreshAllCollections(); err != nil {
return err
}
if err := self.indexer.IndexInitialize(self); err != nil {
return err
}
// setup aggregators (currently this is just the SQL implementation)
self.aggregator[``] = self
return nil
}
func (self *SqlBackend) Ping(timeout time.Duration) error {
if self.db == nil {
return fmt.Errorf("Backend not initialized")
} else {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
if err := self.db.PingContext(ctx); err == nil {
return nil
} else {
return fmt.Errorf("Backend unavailable: %v", err)
}
}
}
func (self *SqlBackend) Insert(name string, recordset *dal.RecordSet) error {
if collection, err := self.getCollectionFromCache(name); err == nil {
if tx, err := self.db.Begin(); err == nil {
switch self.String() {
case `mysql`:
// disable zero-means-use-autoincrement for inserts in MySQL
if _, err := tx.Exec(`SET sql_mode='NO_AUTO_VALUE_ON_ZERO'`); err != nil {
defer tx.Rollback()
return err
}
}
// for each record being inserted...
for _, record := range recordset.Records {
if r, err := collection.StructToRecord(record); err == nil {
record = r
} else {
return err
}
// setup query generator
queryGen := self.makeQueryGen(collection)
queryGen.Type = generators.SqlInsertStatement
// add record data to query input
for k, v := range record.Fields {
// convert incoming values to their destination field types
queryGen.InputData[k] = collection.ConvertValue(k, v)
}
// set the primary key
if !typeutil.IsZero(record.ID) && fmt.Sprintf("%v", record.ID) != `0` {
// convert incoming ID to it's destination field type
queryGen.InputData[collection.IdentityField] = collection.ConvertValue(collection.IdentityField, record.ID)
}
// render the query into the final SQL
if stmt, err := filter.Render(queryGen, collection.Name, filter.Null()); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
// execute the SQL
if _, err := tx.Exec(string(stmt[:]), queryGen.GetValues()...); err != nil {
defer tx.Rollback()
return err
}
} else {
defer tx.Rollback()
return err
}
}
// commit transaction
if err := tx.Commit(); err == nil {
if search := self.WithSearch(collection); search != nil {
if err := search.Index(collection, recordset); err != nil {
querylog.Debugf("[%v] index error %v", self, err)
} else {
return err
}
}
return nil
} else {
return err
}
} else {
return err
}
} else {
return err
}
}
func (self *SqlBackend) Exists(name string, id interface{}) bool {
if collection, err := self.getCollectionFromCache(name); err == nil {
if f, err := self.keyQuery(collection, id); err == nil {
if tx, err := self.db.Begin(); err == nil {
defer tx.Commit()
f.Fields = []string{collection.IdentityField}
queryGen := self.makeQueryGen(collection)
if err := queryGen.Initialize(collection.Name); err == nil {
if stmt, err := filter.Render(queryGen, collection.Name, f); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
// perform query
if rows, err := tx.Query(string(stmt[:]), queryGen.GetValues()...); err == nil {
defer rows.Close()
return rows.Next()
} else {
querylog.Debugf("[%v] query error %v", self, err)
}
} else {
querylog.Debugf("[%v] query generator error %v", self, err)
}
} else {
querylog.Debugf("[%v] query generator error %v", self, err)
}
} else {
querylog.Debugf("[%v] transaction error %v", self, err)
}
} else {
querylog.Debugf("[%v] error generating key query: %v", self, err)
}
} else {
querylog.Debugf("[%v] cache error %v", self, err)
}
return false
}
func (self *SqlBackend) Retrieve(name string, id interface{}, fields ...string) (*dal.Record, error) {
if collection, err := self.getCollectionFromCache(name); err == nil {
if f, err := self.keyQuery(collection, id); err == nil {
f.Fields = fields
queryGen := self.makeQueryGen(collection)
if err := queryGen.Initialize(collection.Name); err == nil {
if stmt, err := filter.Render(queryGen, collection.Name, f); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
// perform query
if rows, err := self.db.Query(string(stmt[:]), queryGen.GetValues()...); err == nil {
defer rows.Close()
if columns, err := rows.Columns(); err == nil {
if rows.Next() {
return self.scanFnValueToRecord(queryGen, collection, columns, reflect.ValueOf(rows.Scan), fields)
} else {
// if it doesn't exist, make sure it's not indexed
if search := self.WithSearch(collection); search != nil {
defer search.IndexRemove(collection, []interface{}{id})
}
return nil, fmt.Errorf("Record %v does not exist", id)
}
} else {
return nil, err
}
} else {
return nil, fmt.Errorf("retrieve error: %v", err)
}
} else {
return nil, err
}
} else {
return nil, err
}
} else {
return nil, err
}
} else {
return nil, err
}
}
func (self *SqlBackend) Update(name string, recordset *dal.RecordSet, target ...string) error {
var targetFilter *filter.Filter
if len(target) > 0 {
if f, err := filter.Parse(target[0]); err == nil {
targetFilter = f
} else {
return err
}
}
if collection, err := self.getCollectionFromCache(name); err == nil {
if tx, err := self.db.Begin(); err == nil {
// for each record being updated...
for _, record := range recordset.Records {
if r, err := collection.StructToRecord(record); err == nil {
record = r
} else {
return err
}
// setup query generator
queryGen := self.makeQueryGen(collection)
queryGen.Type = generators.SqlUpdateStatement
var recordUpdateFilter *filter.Filter
// if this record was specified without a specific ID, attempt to use the broader
// target filter (if given)
if record.ID == `` {
if len(target) > 0 {
recordUpdateFilter = targetFilter
} else {
defer tx.Rollback()
return fmt.Errorf("Update must target at least one record")
}
} else if f, err := self.keyQuery(collection, record); err == nil {
// try to build a filter targeting this specific record
recordUpdateFilter = f
} else {
defer tx.Rollback()
return err
}
// add all non-ID fields to the record's Fields set
for k, v := range record.Fields {
if k != collection.IdentityField {
if field, ok := collection.GetField(k); ok {
if converted, err := field.ConvertValue(v); err == nil {
queryGen.InputData[k] = converted
} else {
return fmt.Errorf("field %v: %v", field.Name, err)
}
} else {
querylog.Warningf("Nonexistent field %q on collection %q", k, collection.Name)
}
}
}
// generate SQL
if stmt, err := filter.Render(queryGen, collection.Name, recordUpdateFilter); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
// execute SQL
if _, err := tx.Exec(string(stmt[:]), queryGen.GetValues()...); err != nil {
defer tx.Rollback()
return err
}
} else {
defer tx.Rollback()
return err
}
}
if err := tx.Commit(); err == nil {
if search := self.WithSearch(collection); search != nil {
if err := search.Index(collection, recordset); err != nil {
return err
}
}
return nil
} else {
return err
}
} else {
return err
}
} else {
return err
}
}
func (self *SqlBackend) Delete(name string, ids ...interface{}) error {
if collection, err := self.getCollectionFromCache(name); err == nil {
// remove documents from index
if search := self.WithSearch(collection); search != nil {
defer search.IndexRemove(collection, ids)
}
// TODO: need to work out how to handle DELETEs on tables with composite keys
// f, err := self.keyQuery(collection, record)
f := filter.New()
f.AddCriteria(filter.Criterion{
Field: collection.IdentityField,
Values: ids,
})
if tx, err := self.db.Begin(); err == nil {
queryGen := self.makeQueryGen(collection)
queryGen.Type = generators.SqlDeleteStatement
// generate SQL
if stmt, err := filter.Render(queryGen, collection.Name, f); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
// execute SQL
if _, err := tx.Exec(string(stmt[:]), queryGen.GetValues()...); err == nil {
if err := tx.Commit(); err == nil {
return nil
} else {
return err
}
} else {
defer tx.Rollback()
return err
}
} else {
defer tx.Rollback()
return err
}
} else {
return err
}
} else {
return err
}
}
func (self *SqlBackend) WithSearch(collection *dal.Collection, filters ...*filter.Filter) Indexer {
return self.indexer
}
func (self *SqlBackend) WithAggregator(collection *dal.Collection) Aggregator {
if aggregator, ok := self.aggregator[collection.GetAggregatorName()]; ok {
return aggregator
}
defaultAggregator, _ := self.aggregator[``]
return defaultAggregator
}
func (self *SqlBackend) ListCollections() ([]string, error) {
return maputil.StringKeys(&self.registeredCollections), nil
}
func (self *SqlBackend) schemaColumnClause(field *dal.Field, gen *generators.Sql) (string, error) {
var def string
// This is weird...
//
// So Array, Object, and Raw fields are stored using the same datatype (BLOB), which
// means that when we read back the schema definition, we don't have a decisive way of
// knowing whether that field should be treated as Raw or Object/Array. So we create Object/Array fields
// with a specific length. This serves as a hint to us that we should treat this field as a certain type.
//
// We could also do this with comments, but not all SQL servers necessarily support comments on
// table schemata, so this feels more reliable in practical usage.
//
switch field.Type {
case dal.ObjectType:
field.Length = SqlObjectFieldHintLength
case dal.ArrayType:
field.Length = SqlArrayFieldHintLength
}
if nativeType, err := gen.ToNativeType(field.Type, []dal.Type{field.Subtype}, field.Length); err == nil {
def = fmt.Sprintf("%s %s", gen.ToFieldName(field.Name), nativeType)
} else {
return ``, err
}
if field.Required {
def += ` NOT NULL`
}
if field.Unique {
def += ` UNIQUE`
}
// if the default value is neither nil nor a function
if v := field.DefaultValue; v != nil && !typeutil.IsFunction(field.DefaultValue) {
switch vS := typeutil.String(v); vS {
case `now`:
def += fmt.Sprintf(" DEFAULT %v", self.defaultCurrentTimeString)
default:
def += fmt.Sprintf(" DEFAULT %v", gen.ToNativeValue(field.Type, []dal.Type{field.Subtype}, v))
}
}
return def, nil
}
func (self *SqlBackend) CreateCollection(definition *dal.Collection) error {
// -- sqlite3
// CREATE TABLE foo (
// "id" INTEGER PRIMARY KEY ASC,
// "name" TEXT NOT NULL,
// "enabled" INTEGER(1),
// "created_at" TEXT DEFAULT CURRENT_TIMESTAMP
// );
// -- MySQL
// CREATE TABLE foo (
// `id` INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY,
// `name` TEXT NOT NULL,
// `enabled` TINYINT(1),
// `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP
// );
// -- PostgreSQL
// CREATE TABLE foo (
// "id" BIGSERIAL PRIMARY KEY,
// "name" TEXT NOT NULL,
// "enabled" BOOLEAN,
// "created_at" TIMESTAMP WITHOUT TIME ZONE DEFAULT now_utc()
// );
// -- MS SQL Server
// CREATE TABLE [foo] (
// [id] INT PRIMARY KEY IDENTITY(1,1) NOT NULL,
// [name] NVARCHAR(MAX) NOT NULL,
// [enabled BIT,
// [created_at] [DATETIME] DEFAULT CURRENT_TIMESTAMP
// );
gen := self.makeQueryGen(definition)
stmt := ``
values := make([]interface{}, 0)
if definition.View {
vq := ``
if typeutil.IsArray(definition.ViewQuery) {
lines := sliceutil.Stringify(definition.ViewQuery)
for i, line := range lines {
lines[i] = strings.TrimSpace(line)
}
vq = strings.Join(lines, ` `)
} else {
vq = typeutil.String(definition.ViewQuery)
}
stmt = fmt.Sprintf("CREATE %s VIEW %s AS %s", definition.ViewKeywords, gen.ToTableName(definition.Name), vq)
} else {
if definition.IdentityField == `` {
definition.IdentityField = dal.DefaultIdentityField
}
stmt += fmt.Sprintf("CREATE TABLE %s (", gen.ToTableName(definition.Name))
fields := []string{}
if definition.IdentityField != `` {
switch definition.IdentityFieldType {
case dal.StringType:
fields = append(fields, fmt.Sprintf(self.createPrimaryKeyStrFormat, gen.ToFieldName(definition.IdentityField)))
default:
fields = append(fields, fmt.Sprintf(self.createPrimaryKeyIntFormat, gen.ToFieldName(definition.IdentityField)))
}
}
for _, field := range definition.Fields {
if clause, err := self.schemaColumnClause(&field, gen); err == nil {
fields = append(fields, clause)
} else {
return fmt.Errorf("field %v: %v", field.Name, err)
}
}
// Constraints
// ---------------------------------------------------------------------------------------------
// after we've added all the field definitions, append the PRIMARY KEY () constraint statement
// with all of the key fields in the schema.
primaryKeys := make([]string, 0)
for _, k := range definition.KeyFields() {
primaryKeys = append(primaryKeys, gen.ToFieldName(k.Name))
}
fields = append(fields, fmt.Sprintf("PRIMARY KEY (%s)", strings.Join(primaryKeys, `, `)))
// append foreign key constraints
for _, fk := range definition.GetAllConstraints() {
if err := fk.Validate(); err != nil {
return err
}
locals := sliceutil.Stringify(fk.On)
remotes := sliceutil.Stringify(fk.Field)
// properly wrap field names
for i, local := range locals {
locals[i] = gen.ToFieldName(local)
}
for i, remote := range remotes {
remotes[i] = gen.ToFieldName(remote)
}
constraint := strings.TrimSpace(fmt.Sprintf(
self.foreignKeyConstraintFormat,
strings.Join(locals, `, `),
gen.ToTableName(fk.Collection),
strings.Join(remotes, `, `),
fk.Options,
))
if constraint != `` {
fields = append(fields, constraint)
} else {
return fmt.Errorf("invalid constraint")
}
}
// join all fields on "," and finish building the statement
stmt += strings.Join(fields, `, `)
stmt += `)`
}
if tx, err := self.db.Begin(); err == nil {
querylog.Debugf("[%v] %s", self, string(stmt[:]))
if _, err := tx.Exec(stmt, values...); err == nil {
defer func() {
self.RegisterCollection(definition)
if err := self.refreshCollectionFromDatabase(definition.Name, definition); err != nil {
querylog.Debugf("[%v] failed to refresh collection: %v", self, err)
}
}()
for i := 0; i < 2; i++ {
if err := tx.Commit(); err == nil {
return nil
} else if log.ErrContains(err, `cannot change name of view column`) && definition.View {
var viewName = gen.ToTableName(definition.Name)
var dropView = fmt.Sprintf("DROP VIEW %v", viewName)
if vtx, err := self.db.Begin(); err == nil {
querylog.Debugf("[%v] %s [%v]", self, dropView, viewName)
if _, err := vtx.Exec(dropView, viewName); err == nil {
if err := vtx.Commit(); err == nil {
continue
}
}
}
} else {
return err
}
}
return fmt.Errorf("failed to create collection due to unknown error")
} else {
defer tx.Rollback()
return err
}
} else {
return err
}
}
func (self *SqlBackend) DeleteCollection(collectionName string) error {
if collection, err := self.getCollectionFromCache(collectionName); err == nil {
gen := self.makeQueryGen(collection)
if tx, err := self.db.Begin(); err == nil {
stmt := fmt.Sprintf(self.dropTableQuery, gen.ToTableName(collectionName))
querylog.Debugf("[%v] %s", self, string(stmt[:]))
if _, err := tx.Exec(stmt); err == nil {
return tx.Commit()
} else {
defer tx.Rollback()
return err
}
} else {
return err
}
} else {
return err
}
}
func (self *SqlBackend) GetCollection(name string) (*dal.Collection, error) {
if err := self.refreshCollectionFromDatabase(name, nil); err == nil {
if _, ok := self.knownCollections[name]; !ok {
return nil, dal.CollectionNotFound
}
if collection, err := self.getCollectionFromCache(name); err == nil {
return collection, nil
} else {
return nil, err
}
} else {
return nil, err
}
}
func (self *SqlBackend) Flush() error {
if self.indexer != nil {
return self.indexer.FlushIndex()
}
return nil
}
func (self *SqlBackend) makeQueryGen(collection *dal.Collection) *generators.Sql {
queryGen := generators.NewSqlGenerator()
queryGen.TypeMapping = self.queryGenTypeMapping
if collection != nil {
// perform string normalization on non-pk, non-key string fields
for _, field := range collection.Fields {
if field.Identity || field.Key {
continue
}
if field.Type == dal.StringType {
queryGen.NormalizeFields = append(queryGen.NormalizeFields, field.Name)
}
}
// set the format for string normalization
if v := self.queryGenNormalizerFormat; v != `` {
queryGen.NormalizerFormat = v
}
}
return queryGen
}
func (self *SqlBackend) scanFnValueToRecord(queryGen *generators.Sql, collection *dal.Collection, columns []string, scanFn reflect.Value, wantedFields []string) (*dal.Record, error) {
if scanFn.Kind() != reflect.Func {
return nil, fmt.Errorf("Can only accept a function value")
}
// sql.Row.Scan is strict about how we call it (e.g.: won't return results as a map),
// so we hack...
//
output := make([]interface{}, len(columns))
// put a zero-value instance of each column's type in the result array, which will
// serve as a hint to the sql.Scan function as to how to convert the data
for i, column := range columns {
baseColumn := strings.Split(column, queryGen.TypeMapping.NestedFieldSeparator)[0]
if field, ok := collection.GetField(baseColumn); ok {
if field.DefaultValue != nil {
output[i] = field.GetDefaultValue()
} else if field.Required {
output[i] = field.GetTypeInstance()
} else {
switch field.Type {
case dal.StringType, dal.TimeType, dal.ObjectType:
output[i] = sql.NullString{}
case dal.BooleanType:
output[i] = sql.NullBool{}
case dal.IntType:
output[i] = sql.NullInt64{}
case dal.FloatType:
output[i] = sql.NullFloat64{}
default:
output[i] = make([]byte, 0)
}
}
}
}
rRowArgs := make([]reflect.Value, len(output))
// each argument in the call to scan will be the address of the corresponding
// item in the output array
for i, _ := range output {
rRowArgs[i] = reflect.ValueOf(output).Index(i).Addr()
}
// perform the call to the Scan() function with the correct number of "arguments"
rRowResult := scanFn.Call(rRowArgs)
var err error
// the function should only return one value of type error
if len(rRowResult) == 1 {
v := rRowResult[0].Interface()
if e, ok := v.(error); ok || v == nil {
err = e
} else {
return nil, fmt.Errorf("row scan call returned invalid type (%T)", v)
}
} else {
return nil, fmt.Errorf("invalid response from row scan call")
}
// this is the actual error returned from calling Scan()
if err == nil {
var id interface{}
fields := make(map[string]interface{})
// for each column in the resultset
ColumnLoop:
for i, column := range columns {
nestedPath := strings.Split(column, queryGen.TypeMapping.NestedFieldSeparator)
baseColumn := nestedPath[0]
if field, ok := collection.GetField(baseColumn); ok {
var value interface{}
// convert value types as needed
switch output[i].(type) {
// raw byte arrays will either be strings, blobs, or binary-encoded objects
// we need to figure out which
case []uint8:
value = []byte(output[i].([]uint8))
case sql.NullString:
v := output[i].(sql.NullString)
if v.Valid {
value = []byte(v.String)
} else {
value = nil
}
case sql.NullBool:
v := output[i].(sql.NullBool)
if v.Valid {
value = v.Bool
} else {
value = nil
}
case sql.NullInt64:
v := output[i].(sql.NullInt64)
if v.Valid {
value = v.Int64
} else {