Function escape

lib/sql-string.js:21–93

(val, timeZone, dialect, format)

exports.arrayToList = arrayToList;

function escape(val, timeZone, dialect, format) {
  let prependN = false;
  if (val === undefined || val === null) {
    return 'NULL';
  }
  switch (typeof val) {
    case 'boolean':
    // SQLite doesn't have true/false support. MySQL aliases true/false to 1/0
    // for us. Postgres actually has a boolean type with true/false literals,
    // but sequelize doesn't use it yet.
      if (['sqlite', 'mssql'].includes(dialect)) {
        return +!!val;
      }
      return (!!val).toString();
    case 'number':
      return val.toString();
    case 'string':
    // In mssql, prepend N to all quoted vals which are originally a string (for
    // unicode compatibility)
      prependN = dialect === 'mssql';
      break;
  }

  if (val instanceof Date) {
    val = dataTypes[dialect].DATE.prototype.stringify(val, { timezone: timeZone });
  }

  if (Buffer.isBuffer(val)) {
    if (dataTypes[dialect].BLOB) {
      return dataTypes[dialect].BLOB.prototype.stringify(val);
    }

    return dataTypes.BLOB.prototype.stringify(val);
  }

  if (Array.isArray(val)) {
    const partialEscape = escVal => escape(escVal, timeZone, dialect, format);
    if (dialect === 'postgres' && !format) {
      return dataTypes.ARRAY.prototype.stringify(val, { escape: partialEscape });
    }
    return arrayToList(val, timeZone, dialect, format);
  }

  if (!val.replace) {
    throw new Error(`Invalid value ${logger.inspect(val)}`);
  }

  if (['postgres', 'sqlite', 'mssql', 'snowflake', 'db2'].includes(dialect)) {
    // http://www.postgresql.org/docs/8.2/static/sql-syntax-lexical.html#SQL-SYNTAX-STRINGS
    // http://stackoverflow.com/q/603572/130598
    val = val.replace(/'/g, "''");

    if (dialect === 'postgres') {
      // null character is not allowed in Postgres
      val = val.replace(/\0/g, '\\0');
    }
  } else {