1 files changed, 57 insertions, 0 deletions
diff --git a/db.js b/db.js
new file mode 100644
index 0000000..6e3f3b6
--- /dev/null
+++ b/db.js
@@ -0,0 +1,57 @@
+const sqlite3 = require('sqlite3')
+
+const db = new sqlite3.Database('count.db')
+
+db.run(`CREATE TABLE IF NOT EXISTS tb_count (
+    id    INTEGER      PRIMARY KEY AUTOINCREMENT
+                       NOT NULL
+                       UNIQUE,
+    name  VARCHAR (32) NOT NULL
+                       UNIQUE,
+    num   BIGINT       NOT NULL
+                       DEFAULT (0) 
+);`)
+
+function getNum(name) {
+  return new Promise((resolve, reject) => {
+    db.get('SELECT `name`, `num` from tb_count WHERE `name` = ?', name, (err, row) => {
+      if (err) reject(err)
+
+      resolve(row || { name, num: 0 })
+    })
+  })
+}
+
+function getAll(name) {
+  return new Promise((resolve, reject) => {
+    db.get('SELECT * from tb_count', (err, row) => {
+      if (err) reject(err)
+
+      resolve(row)
+    })
+  })
+}
+
+function setNum(name, num) {
+  return new Promise((resolve, reject) => {
+    db.run(`INSERT INTO tb_count(\`name\`, \`num\`)
+            VALUES($name, $num)
+            ON CONFLICT(name) DO
+            UPDATE SET \`num\` = $num;`
+      , {
+        $name: name,
+        $num: num
+      }
+      , (err, row) => {
+        if (err) reject(err)
+
+        resolve(row)
+      })
+  })
+}
+
+module.exports = {
+  getNum,
+  getAll,
+  setNum
+}
+\ No newline at end of file