mirror of
https://github.com/ncruces/go-sqlite3.git
synced 2026-01-12 14:09:13 +00:00
96 lines
1.9 KiB
Go
96 lines
1.9 KiB
Go
package readervfs_test
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import (
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"database/sql"
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"fmt"
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"log"
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"strings"
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_ "embed"
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_ "github.com/ncruces/go-sqlite3/driver"
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_ "github.com/ncruces/go-sqlite3/embed"
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"github.com/ncruces/go-sqlite3/vfs/readervfs"
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"github.com/psanford/httpreadat"
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)
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//go:embed testdata/test.db
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var testDB string
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func Example_http() {
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readervfs.Create("demo.db", httpreadat.New("https://sanford.io/demo.db"))
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defer readervfs.Delete("demo.db")
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db, err := sql.Open("sqlite3", "file:demo.db?vfs=reader")
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if err != nil {
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log.Fatal(err)
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}
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defer db.Close()
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magname := map[int]string{
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3: "thousand",
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6: "million",
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9: "billion",
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}
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rows, err := db.Query(`
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SELECT period, data_value, magntude, units FROM csv
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WHERE period > '2010'
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LIMIT 10`)
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if err != nil {
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log.Fatal(err)
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}
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defer rows.Close()
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for rows.Next() {
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var period, units string
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var value int64
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var mag int
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err = rows.Scan(&period, &value, &mag, &units)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%s: %d %s %s\n", period, value, magname[mag], units)
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}
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// Output:
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// 2010.03: 17463 million Dollars
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// 2010.06: 17260 million Dollars
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// 2010.09: 15419 million Dollars
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// 2010.12: 17088 million Dollars
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// 2011.03: 18516 million Dollars
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// 2011.06: 18835 million Dollars
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// 2011.09: 16390 million Dollars
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// 2011.12: 18748 million Dollars
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// 2012.03: 18477 million Dollars
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// 2012.06: 18270 million Dollars
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}
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func Example_embed() {
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readervfs.Create("test.db", readervfs.NewSizeReaderAt(strings.NewReader(testDB)))
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defer readervfs.Delete("test.db")
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db, err := sql.Open("sqlite3", "file:test.db?vfs=reader")
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if err != nil {
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log.Fatal(err)
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}
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defer db.Close()
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rows, err := db.Query(`SELECT id, name FROM users`)
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if err != nil {
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log.Fatal(err)
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}
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defer rows.Close()
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for rows.Next() {
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var id, name string
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err = rows.Scan(&id, &name)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%s %s\n", id, name)
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}
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// Output:
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// 0 go
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// 1 zig
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// 2 whatever
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}
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