Should I create new PreparedStatements for each SQL operation or reuse the same one?

Reusing a PreparedStatement for Multiple Operations

In scenarios where a single connection is utilized without a connection pool, there's a question regarding the approach to creating and using PreparedStatements. One option is to create a new PreparedStatement instance for each SQL/DML operation:

<code class="java">for (int i=0; i<p>Alternatively, the same PreparedStatement instance can be reused by clearing its parameters and re-setting values:</p>
<pre class="brush:php;toolbar:false"><code class="java">PreparedStatement preparedStatement = connection.prepareStatement(sql);
for (int i=0; i<p><strong>Recommendation and Multithreaded Considerations</strong></p>
<p>For optimal efficiency, consider executing PreparedStatement operations in batches:</p>
<pre class="brush:php;toolbar:false"><code class="java">public void executeBatch(List<entity> entities) throws SQLException { 
    try (
        Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL);
    ) {
        for (Entity entity : entities) {
            statement.setObject(1, entity.getSomeProperty());
            // ...
            statement.addBatch();
        }

        statement.executeBatch();
    }
}</entity></code>

When working with multithreaded environments, it's crucial to acquire and close connections and statements within the shortest possible scope within the same method block. Following the JDBC idiom using try-with-resources ensures resource management is handled appropriately.

For transactional batches, disable autocommit on the connection and commit only after all batches have completed successfully to avoid potential database inconsistencies.

The above is the detailed content of Should I create new PreparedStatements for each SQL operation or reuse the same one?. For more information, please follow other related articles on the PHP Chinese website!