質問編集履歴
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Daoのコードを掲載しました
test
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```java
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package work;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.Statement;
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public class Dao {
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private String driver;
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private String url;
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private String user;
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private String password;
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private Connection connection;
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private Statement statement;
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private ResultSet resultset;
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/**
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* コンストラクタ
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* @param driver ドライバー
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* @param url URL
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* @param user ユーザー名
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* @param password パスワード
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*/
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public Dao(String driver, String url, String user, String password) {
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this.driver = driver;
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this.url = url;
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this.user = user;
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this.password = password;
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}
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/**
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* 引数なしのコンストラクタ
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* 既定値を使用する
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*/
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public Dao() {
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driver = "ドライバー";
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url = "jdbc:mariadb://localhost:3306/DB名";
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user = "ユーザ名";
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password = "パスワード";
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}
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/**
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* データベースへの接続を行う
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*/
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public synchronized void open() throws Exception {
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Class.forName(driver);
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connection = DriverManager.getConnection(url, user, password);
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statement = connection.createStatement();
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}
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/**
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* SQL 文を実行した結果の ResultSet を返す
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* @param sql SQL 文
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*/
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public ResultSet getResultSet(String sql) throws Exception {
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if ( statement.execute(sql) ) {
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return statement.getResultSet();
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}
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return null;
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}
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/**
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* SQL 文の実行
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* @param sql SQL 文
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*/
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public void execute(String sql) throws Exception {
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statement.execute(sql);
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}
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/**
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* データベースへのコネクションのクローズ
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*/
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public synchronized void close() throws Exception {
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if ( resultset != null ) resultset.close();
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if ( statement != null ) statement.close();
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if ( connection != null ) connection.close();
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}
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}
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```
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