== Using connections

When you need to execute sequential queries (without a transaction), you can create a new connection
or borrow one from the pool:

[source,js]
----
Code not translatable
----

Prepared queries can be created:

[source,js]
----
var Tuple = require("vertx-sql-client-js/tuple");
connection.prepare("SELECT * FROM users WHERE first_name LIKE ?", function (ar1, ar1_err) {
  if (ar1_err == null) {
    var prepared = ar1;
    prepared.query().execute(Tuple.of("julien"), function (ar2, ar2_err) {
      if (ar2_err == null) {
        // All rows
        var rows = ar2;
      }
    });
  }
});

----

NOTE: prepared query caching depends on the `link:../dataobjects.html#SqlConnectOptions#setCachePreparedStatements[cachePreparedStatements]` and
does not depend on whether you are creating prepared queries or use `link:../../jsdoc/module-vertx-sql-client-js_sql_client-SqlClient.html#preparedQuery[direct prepared queries]`

`link:../../jsdoc/module-vertx-sql-client-js_prepared_statement-PreparedStatement.html[can perform efficient batching:

[source,js]
----
{@link examples.SqlClientExamples#usingConnections03(io.vertx.sqlclient.SqlConnection)]`
----