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62 lines
1.2 KiB
62 lines
1.2 KiB
package internal
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import (
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"fmt"
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"os"
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"compress/gzip"
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"path/filepath"
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"github.com/google/cayley/graph"
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"github.com/google/cayley/exporter"
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)
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// Dump the content of the database into a file based
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// on a few different formats
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func Dump(qs graph.QuadStore, outFile, typ string) error {
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var f *os.File
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if outFile == "-" {
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f = os.Stdout
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} else {
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var err error
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f, err = os.Create(outFile)
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if err != nil {
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return fmt.Errorf("could not open file %q: %v", outFile, err)
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}
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defer f.Close()
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fmt.Printf("dumping db to file %q\n", outFile)
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}
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var export *exporter.Exporter
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if filepath.Ext(outFile) == ".gz" {
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gzip := gzip.NewWriter(f)
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defer gzip.Close()
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export = exporter.NewExporter(gzip, qs)
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} else {
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export = exporter.NewExporter(f, qs)
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}
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//TODO: add possible support for exporting specific queries only
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switch typ {
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case "quad":
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export.ExportQuad()
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case "json":
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export.ExportJson()
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// gml/graphml experimental
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case "gml":
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export.ExportGml()
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case "graphml":
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export.ExportGraphml()
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default:
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return fmt.Errorf("unknown format %q", typ)
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}
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if export.Err() != nil {
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return export.Err()
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}
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if outFile != "-" {
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fmt.Printf("%d entries were written\n", export.Count())
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}
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return nil
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}
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