introduced sqltree typescript library

packages/sqltree/src/Command.ts

@@ -0,0 +1,13 @@
+import { EngineDriver, SqlDumper } from "@dbgate/types";
+
+class Command {
+  toSql(driver: EngineDriver) {
+    const dumper = driver.createDumper();
+    this.dumpSql(dumper);
+    return dumper.s;
+  }
+
+  dumpSql(dumper: SqlDumper) {}
+}
+
+export default Command;

packages/sqltree/src/Select.ts

@@ -0,0 +1,31 @@
+import Command from "./Command";
+import { NamedObjectInfo, RangeDefinition, SqlDumper } from "@dbgate/types";
+
+class Select extends Command {
+  topRecords: number;
+  from: NamedObjectInfo;
+  range: RangeDefinition;
+  distinct = false;
+  selectAll = false;
+
+  dumpSql(dumper: SqlDumper) {
+    dumper.put("^select ");
+    if (this.topRecords) {
+      dumper.put("^top %s ", this.topRecords);
+    }
+    if (this.distinct) {
+      dumper.put("^distinct ");
+    }
+    if (this.selectAll) {
+      dumper.put("* ");
+    } else {
+      // TODO
+    }
+    dumper.put("^from %f ", this.from);
+    if (this.range) {
+      dumper.put("^limit %s ^offset %s ", this.range.limit, this.range.offset);
+    }
+  }
+}
+
+export default Select;

packages/sqltree/src/index.ts

@@ -0,0 +1,2 @@
+export { default as Select } from "./Select";
+export { default as Command } from "./Command";