a lot

packages/db/src/sql-builder.ts

@@ -0,0 +1,56 @@
+export function createSqlBuilder() {
+  const join = (obj: Record<string, string> | string[], joiner: string) =>
+    Object.values(obj).filter(Boolean).join(joiner);
+
+  const sb: {
+    where: Record<string, string>;
+    select: Record<string, string>;
+    groupBy: Record<string, string>;
+    orderBy: Record<string, string>;
+    from: string;
+    limit: number | undefined;
+    offset: number | undefined;
+  } = {
+    where: {},
+    from: 'events',
+    select: {},
+    groupBy: {},
+    orderBy: {},
+    limit: undefined,
+    offset: undefined,
+  };
+
+  const getWhere = () =>
+    Object.keys(sb.where).length ? 'WHERE ' + join(sb.where, ' AND ') : '';
+  const getFrom = () => `FROM ${sb.from}`;
+  const getSelect = () =>
+    'SELECT ' + (Object.keys(sb.select).length ? join(sb.select, ', ') : '*');
+  const getGroupBy = () =>
+    Object.keys(sb.groupBy).length ? 'GROUP BY ' + join(sb.groupBy, ', ') : '';
+  const getOrderBy = () =>
+    Object.keys(sb.orderBy).length ? 'ORDER BY ' + join(sb.orderBy, ', ') : '';
+  const getLimit = () => (sb.limit ? `LIMIT ${sb.limit}` : '');
+  const getOffset = () => (sb.offset ? `OFFSET ${sb.offset}` : '');
+
+  return {
+    sb,
+    join,
+    getWhere,
+    getFrom,
+    getSelect,
+    getGroupBy,
+    getOrderBy,
+    getSql: () =>
+      [
+        getSelect(),
+        getFrom(),
+        getWhere(),
+        getGroupBy(),
+        getOrderBy(),
+        getLimit(),
+        getOffset(),
+      ]
+        .filter(Boolean)
+        .join(' '),
+  };
+}