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How to Use PreparedStatements with Dynamic IN Clause Parameters in JDBC?

Patricia Arquette
Release: 2024-12-16 03:42:10
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How to Use PreparedStatements with Dynamic IN Clause Parameters in JDBC?

Using PreparedStatement with IN Clause Parameters

Question:

How can you populate a prepared statement in JDBC with a list of parameters in an IN clause? This is particularly important when the list of parameters may not be known beforehand.

Solution:

To dynamically construct an IN clause with multiple values, follow these steps:

  1. Create a placeholder for each value in the IN clause, using a question mark (?):
var stmt = String.format("select * from test where field in (%s)",
                         values.stream()
                         .map(v -> "?")
                         .collect(Collectors.joining(", ")));
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  1. Prepare the statement using the constructed string:
PreparedStatement pstmt = connection.prepareStatement(stmt);
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  1. Set the values in the IN clause, one by one, starting from index 1:
int index = 1;
for (Object o : values) {
    pstmt.setObject(index++, o); // Replace with appropriate data type
}
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This approach allows you to handle multiple or unknown parameters dynamically.

Alternative Solution Using StringBuilder:

List<String> values = ...;
StringBuilder builder = new StringBuilder();

for (int i = 0; i < values.size(); i++) {
    builder.append("?,");
}

String placeHolders = builder.deleteCharAt(builder.length() - 1).toString();
String stmt = "select * from test where field in (" + placeHolders + ")";
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Follow the same steps as above to prepare the statement and set the values.

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