如何用数据库表的下一个blob条目替换blob中的单词

import java.sql.*;

public class BlobReplacement {
    public static void main(String[] args) {
        // 数据库连接信息
        String url = "jdbc:数据库类型://数据库地址:端口号/数据库名";
        String username = "数据库用户名";
        String password = "数据库密码";
        
        // 1. 连接到数据库
        try (Connection conn = DriverManager.getConnection(url, username, password)) {
            // 2. 选择目标表和字段
            String tableName = "表名";
            String blobColumn = "BLOB字段名";
            
            // 3. 查询和检索BLOB数据
            String query = "SELECT " + blobColumn + " FROM " + tableName;
            try (PreparedStatement stmt = conn.prepareStatement(query);
                 ResultSet rs = stmt.executeQuery()) {
                
                if (rs.next()) {
                    // 获取BLOB数据
                    Blob blobData = rs.getBlob(blobColumn);
                    
                    // 4. 替换单词
                    String content = new String(blobData.getBytes(1, (int) blobData.length()));
                    String replacedContent = content.replaceAll("要替换的单词", "替换后的单词");
                    byte[] replacedBytes = replacedContent.getBytes();
                    
                    // 5. 更新数据库表
                    String updateQuery = "UPDATE " + tableName + " SET " + blobColumn + " = ?";
                    try (PreparedStatement updateStmt = conn.prepareStatement(updateQuery)) {
                        updateStmt.setBytes(1, replacedBytes);
                        updateStmt.executeUpdate();
                    }
                    
                    System.out.println("BLOB数据替换成功！");
                } else {
                    System.out.println("未找到匹配的记录！");
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}