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sqlite.go
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sqlite.go
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package repo
import (
"log"
"math/rand"
"sync"
"github.com/jmoiron/sqlx"
_ "github.com/mattn/go-sqlite3"
)
type SqliteRepo struct {
db *sqlx.DB
updateLock sync.Mutex
}
func (repo *SqliteRepo) Init() bool {
var err error
if repo.db, err = sqlx.Connect("sqlite3", "/tmp/foo.db?mode=memory&cache=shared"); err != nil {
panic(err)
}
repo.db.SetMaxOpenConns(8)
repo.db.SetMaxIdleConns(8)
return true
}
func (repo *SqliteRepo) Seed(itemsInDataSet int) bool {
if _, err := repo.db.Exec(`DROP TABLE IF EXISTS items`); err != nil {
panic(err)
}
if _, err := repo.db.Exec(`DROP TABLE IF EXISTS joined_items`); err != nil {
panic(err)
}
if _, err := repo.db.Exec(`DROP TABLE IF EXISTS items_fts`); err != nil {
panic(err)
}
log.Printf("Seeding data to Sqlite")
sqlStmt := `
CREATE TABLE items (
id INTEGER NOT NULL PRIMARY KEY,
name TEXT,
year INTEGER,
description TEXT
);
CREATE INDEX index_name ON items(name);
CREATE INDEX index_year ON items(year);
CREATE VIRTUAL TABLE items_fts USING fts5 (
id,name,year,description
);
CREATE TABLE joined_items (
id INTEGER NOT NULL PRIMARY KEY,
item_id INTEGER,
description TEXT,
FOREIGN KEY (item_id) REFERENCES items(id)
);
CREATE INDEX index_item_id ON joined_items(item_id);
`
if _, err := repo.db.Exec(sqlStmt); err != nil {
panic(err)
}
tx, err := repo.db.Begin()
if err != nil {
panic(err)
}
stmt, err := tx.Prepare("INSERT INTO items(id, name,year,description) VALUES (?,?,?,?)")
stmt2, err := tx.Prepare("INSERT INTO items_fts(id, name,year,description) VALUES (?,?,?,?)")
stmt3, err := tx.Prepare("INSERT INTO joined_items(id, item_id,description) VALUES (?,?,?)")
if err != nil {
panic(err)
}
defer stmt.Close()
for i := 0; i < itemsInDataSet; i++ {
it := newItem(i)
if _, err = stmt.Exec(i, it.Name, it.Year, it.Description); err != nil {
panic(err)
}
if _, err = stmt2.Exec(i, it.Name, it.Year, it.Description); err != nil {
panic(err)
}
jit := newJoinedItem(i)
if _, err = stmt3.Exec(jit.ID, jit.ID, jit.Description); err != nil {
panic(err)
}
}
tx.Commit()
return true
}
func (repo *SqliteRepo) QueryFullText(textQuery func() string, N int, limit int) (ret []*Item) {
stmt, err := repo.db.Preparex("select * from items_fts where description match ? order by rank limit ?")
if err != nil {
log.Fatal(err)
}
defer stmt.Close()
ret = make([]*Item, 0, limit*N)
for i := 0; i < N; i++ {
rows, err := stmt.Queryx(textQuery(), limit)
if err != nil {
panic(err)
}
for rows.Next() {
it := &Item{}
if err = rows.StructScan(it); err != nil {
panic(err)
}
ret = append(ret, it)
}
rows.Close()
}
return ret
}
func (repo *SqliteRepo) QueryByID(N int, onlyQuery bool) (it *Item) {
stmt, err := repo.db.Preparex("select id,name,year,description from items where id = ?")
if err != nil {
log.Fatal(err)
}
return sqlFetchOne(stmt, N, onlyQuery, rand.Int()%itemsInDataSet)
}
func (repo *SqliteRepo) Query2Cond(N int, onlyQuery bool, limit int) (ret []*Item) {
stmt, err := repo.db.Preparex("select id,name,year,description from items where year > ? and name = ? limit ?")
if err != nil {
log.Fatal(err)
}
return sqlFetchAll(stmt, N, onlyQuery, limit, 2010, randString(), limit)
}
func (repo *SqliteRepo) Query1Cond(N int, onlyQuery bool, limit int) (ret []*Item) {
stmt, err := repo.db.Preparex("select id,name,year,description from items where year > ? limit ?")
if err != nil {
log.Fatal(err)
}
return sqlFetchAll(stmt, N, onlyQuery, limit, 2010, limit)
}
func (repo *SqliteRepo) QueryJoin(N int, limit int, filtersSet [10]interface{}) (ret []*Item) {
stmt, err := repo.db.Preparex("select * from items inner join joined_items on items.id=joined_items.item_id where items.id in (?,?,?,?,?,?,?,?,?,?)")
if err != nil {
log.Fatal(err)
}
return sqlFetchAll(stmt, N, true, limit, filtersSet[:]...)
}
func (repo *SqliteRepo) Update(N int) {
stmt, err := repo.db.Preparex("UPDATE items SET name=?,year=?,description=? WHERE id=?")
if err != nil {
log.Fatal(err)
}
sqlUpdate(stmt, 1)
}
func init() {
registerRepo("sqlite", &SqliteRepo{})
}