Tom Marthenal Tom Marthenal - 10 months ago 109
Java Question

Java: Insert multiple rows into MySQL with PreparedStatement

I want to insert multiple rows into a MySQL table at once using Java. The number of rows is dynamic. In the past I was doing...

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


I'd like to optimize this to use the MySQL-supported syntax:

INSERT INTO table (col1, col2) VALUES ('val1', 'val2'), ('val1', 'val2')[, ...]

but with a
I don't know of any way to do this since I don't know beforehand how many elements
will contain. If it's not possible with a
, how else can I do it (and still escape the values in the array)?


You can create a batch by PreparedStatement#addBatch() and execute it by PreparedStatement#executeBatch().

Here's a kickoff example:

public void save(List<Entity> entities) throws SQLException {
    try (
        Connection connection = database.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL_INSERT);
    ) {
        int i = 0;

        for (Entity entity : entities) {
            statement.setString(1, entity.getSomeProperty());
            // ...


            if (i % 1000 == 0 || i == entities.size()) {
                statement.executeBatch(); // Execute every 1000 items.

It's executed every 1000 items because some JDBC drivers and/or DBs may have a limitation on batch length.

See also: