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query.go
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query.go
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package gorethink
import (
"fmt"
"strconv"
"strings"
p "github.com/dancannon/gorethink/ql2"
)
type OptArgs interface {
toMap() map[string]interface{}
}
type termsList []Term
type termsObj map[string]Term
type Term struct {
name string
rootTerm bool
termType p.Term_TermType
data interface{}
args []Term
optArgs map[string]Term
}
// build takes the query tree and prepares it to be sent as a JSON
// expression
func (t Term) build() interface{} {
switch t.termType {
case p.Term_DATUM:
return t.data
case p.Term_BINARY:
if len(t.args) == 0 {
return map[string]interface{}{
"$reql_type$": "BINARY",
"data": t.data,
}
}
}
args := []interface{}{}
optArgs := map[string]interface{}{}
for _, v := range t.args {
args = append(args, v.build())
}
for k, v := range t.optArgs {
optArgs[k] = v.build()
}
return []interface{}{t.termType, args, optArgs}
}
// String returns a string representation of the query tree
func (t Term) String() string {
switch t.termType {
case p.Term_MAKE_ARRAY:
return fmt.Sprintf("[%s]", strings.Join(argsToStringSlice(t.args), ", "))
case p.Term_MAKE_OBJ:
return fmt.Sprintf("{%s}", strings.Join(optArgsToStringSlice(t.optArgs), ", "))
case p.Term_FUNC:
// Get string representation of each argument
args := []string{}
for _, v := range t.args[0].args {
args = append(args, fmt.Sprintf("var_%d", v.data))
}
return fmt.Sprintf("func(%s r.Term) r.Term { return %s }",
strings.Join(args, ", "),
t.args[1].String(),
)
case p.Term_VAR:
return fmt.Sprintf("var_%s", t.args[0])
case p.Term_IMPLICIT_VAR:
return "r.Row"
case p.Term_DATUM:
switch v := t.data.(type) {
case string:
return strconv.Quote(v)
default:
return fmt.Sprintf("%v", v)
}
case p.Term_BINARY:
if len(t.args) == 0 {
return fmt.Sprintf("r.binary(<data>)")
}
}
if t.rootTerm {
return fmt.Sprintf("r.%s(%s)", t.name, strings.Join(allArgsToStringSlice(t.args, t.optArgs), ", "))
} else {
return fmt.Sprintf("%s.%s(%s)", t.args[0].String(), t.name, strings.Join(allArgsToStringSlice(t.args[1:], t.optArgs), ", "))
}
}
type WriteResponse struct {
Errors int
Created int
Inserted int
Updated int
Unchanged int
Replaced int
Renamed int
Deleted int
GeneratedKeys []string `gorethink:"generated_keys"`
FirstError string `gorethink:"first_error"` // populated if Errors > 0
Changes []WriteChanges
}
type WriteChanges struct {
NewValue interface{} `gorethink:"new_val"`
OldValue interface{} `gorethink:"old_val"`
}
type RunOpts struct {
Db interface{} `gorethink:"db,omitempty"`
Profile interface{} `gorethink:"profile,omitempty"`
UseOutdated interface{} `gorethink:"use_outdated,omitempty"`
NoReply interface{} `gorethink:"noreply,omitempty"`
ArrayLimit interface{} `gorethink:"array_limit,omitempty"`
TimeFormat interface{} `gorethink:"time_format,omitempty"`
GroupFormat interface{} `gorethink:"group_format,omitempty"`
BinaryFormat interface{} `gorethink:"binary_format,omitempty"`
// Unsupported options
BatchConf interface{} `gorethink:"batch_conf,omitempty"`
}
func (o *RunOpts) toMap() map[string]interface{} {
return optArgsToMap(o)
}
// Run runs a query using the given connection.
//
// rows, err := query.Run(sess)
// if err != nil {
// // error
// }
//
// var doc MyDocumentType
// for rows.Next(&doc) {
// // Do something with document
// }
func (t Term) Run(s *Session, optArgs ...RunOpts) (*Cursor, error) {
opts := map[string]interface{}{}
if len(optArgs) >= 1 {
opts = optArgs[0].toMap()
}
return s.startQuery(t, opts)
}
// RunWrite runs a query using the given connection but unlike Run automatically
// scans the result into a variable of type WriteResponse. This function should be used
// if you are running a write query (such as Insert, Update, TableCreate, etc...)
//
// res, err := r.Db("database").Table("table").Insert(doc).RunWrite(sess, r.RunOpts{
// NoReply: true,
// })
func (t Term) RunWrite(s *Session, optArgs ...RunOpts) (WriteResponse, error) {
var response WriteResponse
res, err := t.Run(s, optArgs...)
if err == nil {
err = res.One(&response)
}
return response, err
}
// Exec runs the query but does not return the result.
func (t Term) Exec(s *Session, optArgs ...RunOpts) error {
res, err := t.Run(s, optArgs...)
if err != nil {
return err
}
if res == nil {
return nil
}
err = res.Close()
if err != nil {
return err
}
return nil
}