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database.go
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database.go
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package db
import (
"database/sql"
"fmt"
"log"
"os"
"path/filepath"
"strings"
"sync"
_ "github.com/mattn/go-sqlite3"
)
type dbcon struct {
db *sql.DB
}
var instance *dbcon
type query struct {
string string
}
var (
onece sync.Once
db *dbcon
)
func DB() *dbcon {
if instance == nil {
onece.Do(func() {
db, err := sql.Open("sqlite3", GetDBFile())
if err != nil || db == nil {
log.Println(err.Error())
}
instance = &dbcon{db}
})
}
return instance
}
var (
one sync.Once
instanceOne *dbcon
)
var (
baseDir = filepath.Join(".config", "todo")
dataFile = "data"
)
func getInstance() *dbcon {
if instance == nil {
return &dbcon{}
}
return instance
}
var mu sync.Mutex
func getInstance2() *dbcon {
mu.Lock()
defer mu.Unlock()
if instance == nil {
return &dbcon{}
}
return instance
}
func getInstance3() *dbcon {
one.Do(func() {
instance = &dbcon{}
})
return instance
}
func Insert(table string, m map[string]string) {
n := make([]string, 0, len(m))
v := make([]string, 0, len(m))
for name, value := range m {
n = append(n, name)
v = append(v, value)
}
q := fmt.Sprintf("insert into %s (%s) values ('%s') ", table, strings.Join(n, string(",")), strings.Join(v, string("','")))
db, err := sql.Open("sqlite3", GetDBFile())
if err != nil || db == nil {
log.Println(err.Error())
}
if _, err := db.Exec(q); err != nil {
log.Println(err.Error())
}
}
func Select(table string, w map[string]string) [][]string {
if len(table) == 0 {
table = "todo"
}
u := make([]string, 0, len(w))
q := fmt.Sprintf("select short_id,title from todo")
if len(w) > 0 {
for name, value := range w {
u = append(u, name+"='"+value+"'")
}
q = fmt.Sprintf(q+" where %s", strings.Join(u, string(",")))
}
db, err := sql.Open("sqlite3", GetDBFile())
if err != nil || db == nil {
log.Println(err.Error())
}
var a [][]string
rows, err := db.Query(q)
var id string
var title string
for rows.Next() {
rows.Scan(&id, &title)
a = append(a, []string{id, title})
}
rows.Close()
return a
}
func Update(table string, m map[string]string, w map[string]string) (bool, error) {
if len(table) < 1 {
table = "todo"
}
db, err := sql.Open("sqlite3", GetDBFile())
if err != nil || db == nil {
log.Println(err.Error())
}
v := make([]string, 0, len(m))
for name, value := range m {
v = append(v, name+"="+value)
}
u := make([]string, 0, len(w))
for name, value := range w {
u = append(u, name+"='"+value+"'")
}
q := fmt.Sprintf("update %s set %s where %s", table, strings.Join(v, string(",")), strings.Join(u, string(",")))
if _, err := db.Exec(q); err != nil {
log.Println(err.Error())
}
return true, nil
}
func Delete(table string, w map[string]string) (bool, error) {
db, err := sql.Open("sqlite3", GetDBFile())
if err != nil || db == nil {
log.Println(err.Error())
}
u := make([]string, 0, len(w))
for name, value := range w {
u = append(u, name+"='"+value+"'")
}
q := fmt.Sprintf("delete from todo where %s", strings.Join(u, string(",")))
if _, err := db.Exec(q); err != nil {
log.Println(err.Error())
}
return true, nil
}
func GetDBFile() string {
homeDir, _ := os.UserHomeDir()
configDir := filepath.Join(homeDir, baseDir)
dbFile := configDir + string(os.PathSeparator) + dataFile
return dbFile
}