97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
package ckh
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import (
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"database/sql"
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"log"
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"os"
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"strings"
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"time"
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_ "github.com/go-sql-driver/mysql"
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)
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// db stores the connection to the database
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var db *sql.DB
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// DSNGenerator returns DSN filed with values from environment
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func DSNGenerator() string {
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db_user := "checkhome"
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db_password := "checkhome"
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db_host := ""
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db_db := "checkhome"
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if v, exists := os.LookupEnv("MYSQL_HOST"); exists {
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db_host = v
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}
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if v, exists := os.LookupEnv("MYSQL_PASSWORD"); exists {
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db_password = v
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} else if v, exists := os.LookupEnv("MYSQL_ROOT_PASSWORD"); exists {
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db_user = "root"
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db_password = v
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}
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if v, exists := os.LookupEnv("MYSQL_USER"); exists {
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db_user = v
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}
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if v, exists := os.LookupEnv("MYSQL_DATABASE"); exists {
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db_db = v
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}
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return db_user + ":" + db_password + "@" + db_host + "/" + db_db
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}
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// DBInit establishes the connection to the database
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func DBInit(dsn string) (err error) {
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if db, err = sql.Open("mysql", dsn + "?parseTime=true&foreign_key_checks=1"); err != nil {
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return
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}
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_, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';`)
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for i := 0; err != nil && i < 15; i += 1 {
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if _, err = db.Exec(`SET SESSION sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';`); err != nil && i <= 5 {
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log.Println("An error occurs when trying to connect to DB, will retry in 2 seconds: ", err)
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time.Sleep(2 * time.Second)
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}
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}
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return
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}
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// DBCreate creates all necessary tables used by the package
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func DBCreate() (err error) {
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ct := `
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CREATE TABLE IF NOT EXISTS rooms (id_room INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT, label TEXT NOT NULL);
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CREATE TABLE IF NOT EXISTS tags (id_tag INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT, label TEXT NOT NULL);
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CREATE TABLE IF NOT EXISTS items (id_item INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT, label TEXT NOT NULL, description TEXT NOT NULL, id_room INTEGER);
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CREATE TABLE IF NOT EXISTS item_tag (id_item INTEGER NOT NULL, id_tag INTEGER NOT NULL);
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CREATE TABLE IF NOT EXISTS users (id_user INTEGER NOT NULL, username VARCHAR(255), password BINARY(64));
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`
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for _, ln := range strings.Split(ct, "\n") {
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if len(ln) == 0 {
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continue
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}
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if _, err = db.Exec(ln); err != nil {
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return
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}
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}
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return
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}
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func DBClose() error {
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return db.Close()
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}
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func DBPrepare(query string) (*sql.Stmt, error) {
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return db.Prepare(query)
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}
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func DBQuery(query string, args ...interface{}) (*sql.Rows, error) {
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return db.Query(query, args...)
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}
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func DBExec(query string, args ...interface{}) (sql.Result, error) {
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return db.Exec(query, args...)
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}
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func DBQueryRow(query string, args ...interface{}) *sql.Row {
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return db.QueryRow(query, args...)
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}
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