How to Efficiently Use PreparedStatement with an IN Clause for Multiple Parameters in JDBC?

Using PreparedStatement with IN Clause for Multiple Parameters

When executing a SQL query with an IN clause using JDBC's PreparedStatement, setting the values for multiple parameters can be challenging.

Handling Predetermined Parameters

If the list of parameters is known beforehand, use the following approach:

• Construct a String query with multiple placeholders for the parameters.
• Prepare the statement using this String query.
• Iterate over the parameters and set them using setObject() method.

Handling Unknown Parameters

If the list of parameters is not known beforehand, use the following steps:

• Append a "?" placeholder for each possible value in the IN clause query.
• Use String.format() to create the query String with the corresponding number of placeholders.
• Prepare the statement using this modified query String.
• Iterate over the parameters and set them using setObject() method.

For example, to set the parameters for query Select * from test where field in (?) with multiple values, you can use the following code:

String query = String.format("select * from test where field in (%s)",
                             values.stream()
                             .map(v -> "?")
                             .collect(Collectors.joining(", ")));

PreparedStatement stmt = connection.prepareStatement(query);

int index = 1;
for (Object o : values) {
    stmt.setObject(index++, o);
}

This approach ensures that the IN clause can dynamically accommodate any number of parameters, allowing for flexible query execution.

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