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schema.go
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schema.go
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// Copyright 2011-2018 Paul Ruane.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package database
import (
"database/sql"
"fmt"
"github.com/oniony/TMSU/common"
)
// unexported
var latestSchemaVersion = schemaVersion{common.Version{0, 7, 0}, 1}
func currentSchemaVersion(tx *sql.Tx) schemaVersion {
sql := `
SELECT *
FROM version`
var major, minor, patch, revision uint
rows, err := tx.Query(sql)
if err != nil {
return schemaVersion{}
}
defer rows.Close()
if rows.Next() && rows.Err() == nil {
err := rows.Scan(&major, &minor, &patch, &revision)
if err != nil {
// might be prior to schema 0.7.0-1 where there was no revision column
rows.Scan(&major, &minor, &patch) // ignore errors
}
}
return schemaVersion{common.Version{major, minor, patch}, revision}
}
func insertSchemaVersion(tx *sql.Tx, version schemaVersion) error {
sql := `
INSERT INTO version (major, minor, patch, revision)
VALUES (?, ?, ?, ?)`
result, err := tx.Exec(sql, version.Major, version.Minor, version.Patch, version.Revision)
if err != nil {
return fmt.Errorf("could not update schema version: %v", err)
}
rowsAffected, err := result.RowsAffected()
if err != nil {
return err
}
if rowsAffected != 1 {
return fmt.Errorf("version could not be inserted: expected exactly one row to be affected")
}
return nil
}
func updateSchemaVersion(tx *sql.Tx, version schemaVersion) error {
sql := `
UPDATE version SET major = ?, minor = ?, patch = ?, revision = ?`
result, err := tx.Exec(sql, version.Major, version.Minor, version.Patch, version.Revision)
if err != nil {
return fmt.Errorf("could not update schema version: %v", err)
}
rowsAffected, err := result.RowsAffected()
if err != nil {
return err
}
if rowsAffected != 1 {
return fmt.Errorf("version could not be updated: expected exactly one row to be affected")
}
return nil
}
func createSchema(tx *sql.Tx) error {
if err := createTagTable(tx); err != nil {
return err
}
if err := createFileTable(tx); err != nil {
return err
}
if err := createValueTable(tx); err != nil {
return err
}
if err := createFileTagTable(tx); err != nil {
return err
}
if err := createImplicationTable(tx); err != nil {
return err
}
if err := createQueryTable(tx); err != nil {
return err
}
if err := createSettingTable(tx); err != nil {
return err
}
if err := createVersionTable(tx); err != nil {
return err
}
if err := insertSchemaVersion(tx, latestSchemaVersion); err != nil {
return err
}
return nil
}
func createTagTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS tag (
id INTEGER PRIMARY KEY,
name TEXT NOT NULL
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
sql = `
CREATE INDEX IF NOT EXISTS idx_tag_name
ON tag(name)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createFileTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS file (
id INTEGER PRIMARY KEY,
directory TEXT NOT NULL,
name TEXT NOT NULL,
fingerprint TEXT NOT NULL,
mod_time DATETIME NOT NULL,
size INTEGER NOT NULL,
is_dir BOOLEAN NOT NULL,
CONSTRAINT con_file_path UNIQUE (directory, name)
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
sql = `
CREATE INDEX IF NOT EXISTS idx_file_fingerprint
ON file(fingerprint)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createValueTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS value (
id INTEGER PRIMARY KEY,
name TEXT NOT NULL,
CONSTRAINT con_value_name UNIQUE (name)
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createFileTagTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS file_tag (
file_id INTEGER NOT NULL,
tag_id INTEGER NOT NULL,
value_id INTEGER NOT NULL,
PRIMARY KEY (file_id, tag_id, value_id),
FOREIGN KEY (file_id) REFERENCES file(id),
FOREIGN KEY (tag_id) REFERENCES tag(id)
FOREIGN KEY (value_id) REFERENCES value(id)
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
sql = `
CREATE INDEX IF NOT EXISTS idx_file_tag_file_id
ON file_tag(file_id)`
if _, err := tx.Exec(sql); err != nil {
return err
}
sql = `
CREATE INDEX IF NOT EXISTS idx_file_tag_tag_id
ON file_tag(tag_id)`
if _, err := tx.Exec(sql); err != nil {
return err
}
sql = `
CREATE INDEX IF NOT EXISTS idx_file_tag_value_id
ON file_tag(value_id)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createImplicationTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS implication (
tag_id INTEGER NOT NULL,
value_id INTEGER NOT NULL,
implied_tag_id INTEGER NOT NULL,
implied_value_id INTEGER NOT NULL,
PRIMARY KEY (tag_id, value_id, implied_tag_id, implied_value_id)
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createQueryTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS query (
text TEXT PRIMARY KEY
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createSettingTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS setting (
name TEXT PRIMARY KEY,
value TEXT NOT NULL
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}
func createVersionTable(tx *sql.Tx) error {
sql := `
CREATE TABLE IF NOT EXISTS version (
major NUMBER NOT NULL,
minor NUMBER NOT NULL,
patch NUMBER NOT NULL,
revision NUMBER NOT NULL,
PRIMARY KEY (major, minor, patch, revision)
)`
if _, err := tx.Exec(sql); err != nil {
return err
}
return nil
}