preparedStatement1.executeQuery();

This code executes a SQL query on a database using a prepared statement. The query is specified in the prepared statement, along with any parameters that need to be substituted into the query. The executeQuery() method of the prepared statement is called to execute the query and return a ResultSet object that contains the results of the query. The ResultSet can be used to iterate over the rows returned by the query and retrieve the values of the columns in each row.

相关问题

ResultSet resultSet=preparedStatement1.executeQuery();

This line of code executes a SQL query using a prepared statement object (preparedStatement1) and stores the result set in a ResultSet object (resultSet). The result set contains the rows returned by the SQL query and allows the application to iterate over them and retrieve the values of the columns in each row.

ResultSet resultSet=preparedStatement1.executeQuery();不执行

该语句不会执行，因为它只是定义了一个ResultSet对象，但没有执行任何查询语句。要执行查询，需要在预编译的语句中设置参数，然后调用executeQuery()方法来执行查询并返回结果集。例如：

PreparedStatement preparedStatement1 = connection.prepareStatement("SELECT * FROM my_table WHERE column1 = ?");
preparedStatement1.setString(1, "value1");
ResultSet resultSet = preparedStatement1.executeQuery(); // 执行查询并返回结果集