How to Insert Multiple Rows into MySQL Using PreparedStatement in Java?

How can I efficiently insert multiple rows into a MySQL table using PreparedStatement in Java while handling a dynamic number of rows?

for (String[] element : array) {
    myStatement.setString(1, element[0]);
    myStatement.setString(2, element[1]);
    myStatement.addBatch();
}

myStatement.executeBatch();

Inserting multiple rows into a MySQL database using Java can be optimized with PreparedStatement and batch processing. This method improves performance compared to individual insertions, especially when dealing with dynamically sized datasets. Here’s how to do it.

String sql = "INSERT INTO table (col1, col2) VALUES (?, ?)");
PreparedStatement myStatement = connection.prepareStatement(sql);

for (String[] element : array) {
    myStatement.setString(1, element[0]);
    myStatement.setString(2, element[1]);
    myStatement.addBatch();
}
myStatement.executeBatch();
myStatement.close();

Causes

• Inefficient single-row insertions can slow down the application.
• Dynamic row counts make traditional looping cumbersome.
• PreparedStatement does not directly support multiple value inserts without a fixed number of parameters.

Solutions

• Utilize batch processing with PreparedStatement to group multiple insertion commands.
• Dynamically construct the SQL statement to handle varying row counts efficiently.
• Escape input values correctly to prevent SQL injection.

Mistake: Forgetting to call executeBatch() which means no data is actually sent to the database.

Solution: Always ensure executeBatch() is called after adding all insertions to send the batch to the database.

Mistake: Not properly managing database connections, leaving them open after execution.

Solution: Ensure you close PreparedStatement and Connection objects after processing to free up resources.

Mistake: Not handling SQL exceptions or transaction management properly.

Solution: Implement appropriate try-catch blocks and manage transactions as needed.