Add IN support

lib/database.js

@@ -8,7 +8,10 @@ const formatWhere = (where) =>
   where
     .filter((condition) => !!condition)
     .map((condition) =>
-      Object.entries(condition).filter((entry) => entry[1] !== undefined)
+      Object.entries(condition).filter((entry) => {
+        if (Array.isArray(entry[1])) return entry[1].length !== 0;
+        return entry[1] !== undefined;
+      })
     )
     .filter((params) => params.length !== 0)
     .map(Object.fromEntries);
@@ -21,11 +24,15 @@ const whereValue = (value) => {
         return [op, value.substring(len)];
       }
     }
+
     if (value.includes('*') || value.includes('?')) {
       const mask = value.replace(/\*/g, '%').replace(/\?/g, '_');
       return ['LIKE', mask];
     }
   }
+  if (Array.isArray(value)) {
+    return ['IN', value];
+  }
   return ['=', value];
 };
 
@@ -38,8 +45,15 @@ const buildWhere = (conditions, firstArgIndex = 1) => {
     const keys = Object.keys(where);
     for (const key of keys) {
       const [operator, value] = whereValue(where[key]);
-      conjunction.push(`"${key}" ${operator} $${i++}`);
-      args.push(value);
+      if (Array.isArray(value)) {
+        conjunction.push(
+          `"${key}" ${operator} (${value.map(() => `$${i++}`).join(',')})`
+        );
+        args.push(...value);
+      } else {
+        conjunction.push(`"${key}" ${operator} $${i++}`);
+        args.push(value);
+      }
     }
     disjunction.push(conjunction.join(' AND '));
   }
@@ -109,23 +123,6 @@ class Query {
       resolve(result.rows);
     }, reject);
   }
-
-  toObject() {
-    return {
-      table: this.table,
-      fields: [...this.fields],
-      where: this.where.map((cond) => ({ ...cond })),
-      options: this.options,
-    };
-  }
-
-  static from(db, metadata) {
-    const { table, fields, where, options } = metadata;
-    const conditions = where.map((cond) => ({ ...cond }));
-    const query = new Query(db, table, fields, ...conditions);
-    Object.assign(query.options, options);
-    return query;
-  }
 }
 
 class Database {