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To complete the deleteOrgmgMenu method using the QueryRunner from Apache Commons DbUtils, you should handle SQL deletion with proper precautions against SQL injection. Since you're dealing with a set of Long IDs, I'll demonstrate using a parameterized query to ensure safe deletion of entries from the database based on the IDs provided in menuIds.

proper: 适当的
precautions: 预防措施
against: 防止
dealing: 处理
demonstrate: 演示
parameterized: 参数化的
entries: 条目

Here's how you can implement the method using the QueryRunner and handling possible SQL exceptions:

import org.apache.commons.dbutils.QueryRunner;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Set;

public class DatabaseUtility {

    private static final QueryRunner RUNNER = new QueryRunner();

    public static void deleteOrgmgMenu(Connection conn, Set<Long> menuIds) throws SQLException {
        if (menuIds == null || menuIds.isEmpty()) {
            // Nothing to delete if the set is empty or null
            return;
        }

        // Convert the Set of Longs to a comma-separated string for use in SQL IN clause
        String ids = String.join(",", menuIds.stream().map(String::valueOf).toArray(String[]::new));
        
        // SQL query for deleting records
        String deleteSql = "DELETE FROM SYS_MENU WHERE ID IN (" + ids + ")";

        // Execute the update
        int affectedRows = RUNNER.update(conn, deleteSql);

        // Optionally, you can use the number of affected rows for further logic or confirmation
        System.out.println(affectedRows + " rows were deleted.");
    }
}

Key Points and Considerations:

  1. Set Handling: First, the method checks if the menuIds set is null or empty. If it is, the method returns early as there's nothing to delete.

  2. SQL Injection Risk: Directly using IDs from a set in a SQL query typically exposes the code to SQL injection attacks. However, since IDs are of type Long, the risk is inherently mitigated because numeric values (if properly validated or inherently safe as in this case where they're not derived from user input directly) do not pose an injection risk. Nevertheless, it is generally better to use parameterized queries or prepared statements for such operations.

  3. Dynamic SQL: The IDs are joined into a comma-separated string to fit into the SQL IN clause. This allows for dynamic deletion based on multiple IDs.

  4. Execution and Results: The method executes the deletion and prints the number of affected rows, which is useful for debugging or confirmation of how many records were deleted.

More Secure Alternative Using Parameterized Queries:

For better security practices, especially in cases where inputs might not strictly be controlled or validated as numeric, you should use parameterized queries:

public static void deleteOrgmgMenu(Connection conn, Set<Long> menuIds) throws SQLException {
    if (menuIds == null || menuIds.isEmpty()) {
        return;
    }

    // Create the placeholders for SQL IN clause
    String placeholders = String.join(", ", Collections.nCopies(menuIds.size(), "?"));
    String deleteSql = "DELETE FROM SYS_MENU WHERE ID IN (" + placeholders + ")";

    // Execute the update with the IDs as parameters
    int affectedRows = RUNNER.update(conn, deleteSql, menuIds.toArray());

    System.out.println(affectedRows + " rows were deleted.");
}

This version uses placeholders (?) for each ID and provides the IDs as an array to the update method, which safely inserts them into the query, preventing any SQL injection risk. This is the recommended approach when handling potentially unsafe input.

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