diff --git a/appsscript.json b/appsscript.json
new file mode 100644
index 0000000..c03f344
--- /dev/null
+++ b/appsscript.json
@@ -0,0 +1,7 @@
+{
+  "timeZone": "Asia/Bangkok",
+  "dependencies": {
+  },
+  "exceptionLogging": "STACKDRIVER",
+  "runtimeVersion": "V8"
+}
\ No newline at end of file
diff --git a/sheetquery.gs b/sheetquery.gs
new file mode 100644
index 0000000..4980d16
--- /dev/null
+++ b/sheetquery.gs
@@ -0,0 +1,371 @@
+/**
+ * Run new sheet query
+ *
+ * @param {Spreadsheet} activeSpreadsheet Specific spreadsheet to use, or will use SpreadsheetApp.getActiveSpreadsheet() if undefined\
+ * @return {SheetQueryBuilder}
+ */
+function sheetQuery(activeSpreadsheet) {
+  return new SheetQueryBuilder(activeSpreadsheet);
+}
+
+/**
+ * SheetQueryBuilder class - Kind of an ORM for Google Sheets
+ */
+class SheetQueryBuilder {
+  constructor(activeSpreadsheet) {
+    this.columnNames = [];
+    this.headingRow = 1;
+    this._sheetHeadings = [];
+    this.activeSpreadsheet = activeSpreadsheet || SpreadsheetApp.getActiveSpreadsheet();
+  }
+  select(columnNames) {
+    this.columnNames = Array.isArray(columnNames) ? columnNames : [columnNames];
+    return this;
+  }
+  /**
+   * Name of spreadsheet to perform operations on
+   *
+   * @param {string} sheetName
+   * @param {number} headingRow
+   * @return {SheetQueryBuilder}
+   */
+  from(sheetName, headingRow = 1) {
+    this.sheetName = sheetName;
+    this.headingRow = headingRow;
+    return this;
+  }
+  /**
+   * Apply a filtering function on rows in a spreadsheet before performing an operation on them
+   *
+   * @param {Function} fn
+   * @return {SheetQueryBuilder}
+   */
+  where(fn) {
+    fn = (typeof fn == 'object') ? filter_fn(fn) : fn;
+    this.whereFn = fn;
+    return this;
+  }
+  /**
+   * Get Sheet object that is referenced by the current query from() method
+   *
+   * @return {Sheet}
+   */
+  getSheet() {
+    if (!this.sheetName) {
+      throw new Error('SheetQuery: No sheet selected. Select sheet with .from(sheetName) method');
+    }
+    if (!this._sheet) {
+      this._sheet = this.activeSpreadsheet.getSheetByName(this.sheetName);
+    }
+    return this._sheet;
+  }
+  /**
+   * Get values in sheet from current query + where condition
+   */
+  getValues() {
+    if (!this._sheetValues) {
+      const zh = this.headingRow - 1;
+      const sheet = this.getSheet();
+      if (!sheet) 
+        return [];
+      const rowValues = [];
+      const sheetValues = sheet.getDataRange().getValues();
+      const numCols = sheetValues[0] ? sheetValues[0].length : 0;
+      const numRows = sheetValues.length;
+      const headings = (this._sheetHeadings = sheetValues[zh] || []);
+      for (let r = 0; r < numRows; r++) {
+        const obj = { __meta: { row: r + 1, cols: numCols } };
+        for (let c = 0; c < numCols; c++) 
+          obj[headings[c]] = sheetValues[r][c]; // @ts-ignore
+        rowValues.push(obj);
+      }
+      this._sheetValues = rowValues;
+    }
+    return this._sheetValues;
+  }
+  /**
+   * Return matching rows from sheet query excluding the header row
+   *
+   * @return {RowObject[]}
+   */
+  getRows() {
+    const sheetValues = this.getValues().slice(1);
+    return this.whereFn ? sheetValues.filter(this.whereFn) : sheetValues;
+  }
+  /**
+   * Return matching rows from sheet query including the header row
+   *
+   * @return {RowObject[]}
+   */
+  getTable() {
+    const sheetValues = this.getValues();
+    return this.whereFn ? sheetValues.filter(this.whereFn) : sheetValues;
+  }
+  /**
+   * Get array of headings in current sheet from()
+   *
+   * @return {string[]}
+   */
+  getHeadings() {
+    if (!this._sheetHeadings || !this._sheetHeadings.length) {
+      const zh = this.headingRow - 1;
+      const sheet = this.getSheet();
+      const numCols = sheet.getLastColumn();
+      this._sheetHeadings = sheet.getSheetValues(1, 1, this.headingRow, numCols)[zh] || [];
+      this._sheetHeadings = this._sheetHeadings
+        .map((s) => (typeof s === 'string' ? s.trim() : ''))
+        .filter(Boolean);
+    }
+    return this._sheetHeadings || [];
+  }
+  /**
+   * Get all cells from a query + where condition
+   * @returns {any[]}
+   */
+  getCells() {
+    const rows = this.getRows();
+    const returnValues = [];
+    rows.forEach((row) => {
+      returnValues.push(this._sheet.getRange(row.__meta.row, 1, 1, row.__meta.cols).getValue());
+    });
+    return returnValues;
+  }
+  /**
+   * Get cells in sheet from current query + where condition and from specific header
+   * @param {string} key name of the column
+   * @returns {any[]} all the colum cells from the query's rows
+   */
+  getAllByCol(key) {
+    const cells = [];
+    let rows = this.getRows();
+    let indexColumn = 1;
+    let found = false;
+    for (const elem of this._sheetHeadings) {
+      if (elem == key) {
+        found = true;
+        break;
+      }
+      indexColumn++;
+    }
+    if (!found) 
+      throw new Error(`no col found with ${key}`);
+    rows.forEach((row) => {
+      cells.push(this._sheet.getRange(row.__meta.row, indexColumn).getValue());
+    });
+    return cells;
+  }
+  /**
+   * Insert new rows into the spreadsheet
+   * Arrays of objects like { Heading: Value }
+   *
+   * @param {DictObject[]} newRows - Array of row objects to insert
+   * @return {SheetQueryBuilder}
+   */
+  insertRows(newRows) {
+    const sheet = this.getSheet();
+    const headings = this.getHeadings();
+    const allRowsToInsert = [];
+
+    newRows.forEach((row) => {
+      if (!row) 
+        return;
+
+      const rowValues = headings.map((heading) => {
+        const val = row[heading];
+        return val === undefined || val === null || val === false ? '' : val;
+      });
+      allRowsToInsert.push(rowValues);
+    });
+
+    const startRow = sheet.getLastRow() + 1; 
+    const numRows = allRowsToInsert.length;
+    const numCols = headings.length; 
+    const targetRange = sheet.getRange(startRow, 1, numRows, numCols);
+    targetRange.setValues(allRowsToInsert);
+
+    this.clearCache(); // Clear cache to reflect changes in the sheet
+    return this;
+  }
+  /**
+   * Delete matched rows from spreadsheet
+   *
+   * @return {SheetQueryBuilder}
+   */
+  deleteRows() {
+    const rows = this.getRows();
+    let i = 0;
+    rows.forEach((row) => {
+      const deleteRowRange = this._sheet.getRange(row.__meta.row - i, 1, 1, row.__meta.cols);
+      deleteRowRange.deleteCells(SpreadsheetApp.Dimension.ROWS);
+      i++;
+    });
+    this.clearCache();
+    return this;
+  }
+  /**
+   * Update matched rows in spreadsheet with provided function
+   *
+   * @param {UpdateFn} updateFn
+   * @return {SheetQueryBuilder}
+   */
+  updateRows(updateFn, safe = false) {
+    updateFn = (typeof updateFn == 'object') ? update_fn(updateFn) : updateFn;
+    const rows = this.getRows();
+    if (rows.length == 0)
+      throw new Error('filter function did not match anything');
+    for (let i = 0; i < rows.length; i++) 
+      if (safe)
+        this.updateRowSafe(rows[i], updateFn);
+      else
+        this.updateRow(rows[i], updateFn);
+    this.clearCache();
+    return this;
+  }
+  /**
+   * Update single row
+   */
+  updateRow(row, updateFn) {
+    updateFn = (typeof updateFn == 'object') ? update_fn(updateFn) : updateFn;
+    updateFn(row) || row;
+    const rowMeta = row.__meta;
+    const headings = this.getHeadings();
+    delete row.__meta;
+    // Put new array data in order of headings in sheet
+    const arrayValues = headings.map((heading) => {
+      const val = row[heading];
+      return val === undefined || val === null || val === false ? '' : val;
+    });
+    row.__meta = rowMeta; //reattach to avoid edge case where we update the same row again
+    const maxCols = Math.max(rowMeta.cols, arrayValues.length);
+    const updateRowRange = this.getSheet().getRange(rowMeta.row, 1, 1, maxCols);
+    const rangeData = updateRowRange.getValues()[0] || [];
+    // Map over old data in same index order to update it and ensure array length always matches
+    const newValues = rangeData.map((value, index) => {
+      const val = arrayValues[index];
+      return val === undefined || val === null || val === false ? '' : val;
+    });
+    updateRowRange.setValues([newValues]);
+    return this;
+  }
+  /**
+   * Updates specific cells in a row without implicitly overriding other cell values or formulas.
+   * @param {object} row The row object (from getRows()) containing __meta and column data.
+   * @param {object|function(object): object} updateFn An object with key-value pairs for updates,
+   * @return {SheetQueryBuilder}
+   */
+  updateRowSafe(row, updateFn) {
+    updateFn = (typeof updateFn == 'object') ? update_fn(updateFn) : updateFn;
+
+    const sheet = this.getSheet();
+    const headings = this.getHeadings();
+    const rowMeta = row.__meta;
+    const oldRow = {...row};
+    updateFn(row);
+    delete row.__meta;
+
+    // Iterate over the keys (column names) in the row object
+    for (const columnName in row) {
+      if (row[columnName] == oldRow[columnName])
+        continue;
+        
+      const newValue = row[columnName];
+      const columnIndex = headings.indexOf(columnName);
+      if (columnIndex === -1) 
+        throw new Error(`${columnName} not found`)
+      const targetCell = sheet.getRange(rowMeta.row, columnIndex + 1);
+      const valueToSet = (newValue === undefined || newValue === null || newValue === false) ? '' : newValue;
+      targetCell.setValue(valueToSet);
+    }
+    row.__meta = rowMeta; //reattach to avoid edge case where we update the same row again
+    return this;
+  }
+  /**
+   * Sets all values in a specified column by its name.
+   *
+   * @param {string} columnName The name of the column to update.
+   * @param {any} value The single value to set for all cells in the column.
+   * @return {SheetQueryBuilder}
+   */
+  setColumnValues(columnName, value) {
+    const sheet = this.getSheet();
+    if (!sheet) {
+      throw new Error('SheetQuery: No sheet selected or sheet not found.');
+    }
+
+    const headings = this.getHeadings();
+    const columnIndex = headings.indexOf(columnName);
+
+    if (columnIndex === -1) 
+      throw new Error(`SheetQuery: Column '${columnName}' not found in sheet '${this.sheetName}'.`);
+
+    const sheetColumnIndex = columnIndex + 1;
+    const lastRow = sheet.getLastRow();
+    const headingRow = this.headingRow;
+    const targetRange = sheet.getRange(headingRow + 1, sheetColumnIndex, lastRow - headingRow, 1);
+    targetRange.setValue(value);
+    this.clearCache(); // Clear cache to reflect changes
+
+    return this;
+  }
+  /**
+   * Clear cached values, headings, and flush all operations to sheet
+   *
+   * @return {SheetQueryBuilder}
+   */
+  clearCache() {
+    this.whereFn = null;
+    this._sheetValues = null;
+    this._sheetHeadings = [];
+    SpreadsheetApp.flush();
+    return this;
+  }
+}
+
+// util
+function update_fn(updateHash) {
+  let functionBody = '';
+
+  // Iterate over the keys in the updateHash
+  for (const key in updateHash) {
+    // Ensure it's an own property, not inherited
+    if (Object.prototype.hasOwnProperty.call(updateHash, key)) {
+      const value = updateHash[key];
+
+      // Dynamically format the value correctly for inclusion in the function string.
+      // Strings need to be quoted, numbers/booleans/null/undefined can be inserted directly.
+      let formattedValue;
+      if (typeof value === 'string') {
+        // Escape quotes within the string to prevent breaking the generated code
+        formattedValue = JSON.stringify(value);
+      } else if (typeof value === 'object' && value !== null) {
+        // For objects/arrays, JSON.stringify is usually the safest way to embed them,
+        // but be aware of complexity for deeply nested objects.
+        formattedValue = JSON.stringify(value);
+      } else {
+        // For numbers, booleans, null, undefined
+        formattedValue = String(value);
+      }
+
+      // Add the assignment statement to the function body
+      functionBody += `  row["${key}"] = ${formattedValue};\n`;
+    }
+  }
+
+  // Construct the anonymous function using new Function().
+  return new Function('row', functionBody);
+}
+
+function filter_fn(filterHash) {
+  const conditions = [];
+  for (const key in filterHash) {
+    if (Object.prototype.hasOwnProperty.call(filterHash, key)) {
+      const value = filterHash[key];
+      // Escape string values for proper inclusion in the function string
+      const escapedValue = typeof value === 'string' ? `'${value.replace(/'/g, "\\'")}'` : value;
+      conditions.push(`row["${key}"] === ${escapedValue}`);
+    }
+  }
+
+  const functionBody = `return ${conditions.join(' && ')};`;
+  return new Function('row', functionBody);
+}
\ No newline at end of file