79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package db
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import (
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"database/sql"
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_ "github.com/mattn/go-sqlite3"
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"github.com/sirupsen/logrus"
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)
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const migrateScript = `
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alter table blocks add mtime timestamp default NULL;
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update blocks set mtime = current_timestamp;
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create index blocks_mtime on blocks(mtime);
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CREATE TRIGGER update_blocks_mtime_insert after insert on blocks for each row
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begin
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update blocks set mtime = current_timestamp where pos = new.pos;
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end;
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CREATE TRIGGER update_blocks_mtime_update after update on blocks for each row
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begin
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update blocks set mtime = current_timestamp where pos = old.pos;
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end;
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`
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type Sqlite3Accessor struct {
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db *sql.DB
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filename string
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}
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func (db *Sqlite3Accessor) Migrate() error {
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log := logrus.WithFields(logrus.Fields{"prefix": "db/sqlite.Migrate","filename":db.filename})
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//RW connection
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rwdb, err := sql.Open("sqlite3", db.filename + "?mode=rw")
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if err != nil {
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return err
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}
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defer rwdb.Close()
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hasMtime := true
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_, err = rwdb.Query("select max(mtime) from blocks")
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if err != nil {
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hasMtime = false
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}
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if !hasMtime {
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log.Info("Migrating database")
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_, err = rwdb.Exec(migrateScript)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (db *Sqlite3Accessor) FindLatestBlocks(mintime int64, limit int) ([]Block, error) {
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return make([]Block, 0), nil
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}
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func (db *Sqlite3Accessor) FindBlocks(posx int, posz int, posystart int, posyend int) ([]Block, error) {
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return make([]Block, 0), nil
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}
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func (db *Sqlite3Accessor) CountBlocks(x1, x2, y1, y2, z1, z2 int) (int, error) {
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return 0, nil
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}
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func NewSqliteAccessor(filename string) (*Sqlite3Accessor, error) {
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db, err := sql.Open("sqlite3", filename + "?mode=ro")
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if err != nil {
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return nil, err
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}
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sq := &Sqlite3Accessor{db: db, filename: filename}
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return sq, nil
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}
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