resultreader.java

来自「一个Java持久层类库」· Java 代码 · 共 56 行

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package ActiveObject.core;

import java.sql.*;


/**
 * @author tanjiazhang
 */
public class ResultReader {

    private Connection connection = null;
    private PreparedStatement preparedStatement = null;
    private ResultSet resultSet = null;

    public ResultReader(String sql, Object... params) throws java.sql.SQLException
    {
        this.connection = ActiveRecord.getConnection();
        this.preparedStatement = connection.prepareStatement(sql);
        int index = 1;
        for(Object value : params)
            preparedStatement.setObject(index, value);
        this.resultSet = preparedStatement.executeQuery();
    }

    /**
     * 尝试读一行记录，只有返回值为真时，才允许取出该对象
     * @throws java.sql.SQLException
     */
    public boolean read () throws java.sql.SQLException {
        return this.resultSet.next();
    }

    /**
     * 尝试读一行记录，只有返回值为真时，才允许取出该对象
     * @throws java.sql.SQLException
     */
    public ResultSet getResultSet () throws java.sql.SQLException {
        return this.resultSet;
    }

    /**
     * 使用DataReader完毕后必须执行close释放资源
     * @throws java.sql.SQLException
     */
    public void close () throws java.sql.SQLException {
        this.resultSet.close();
        this.preparedStatement.close();
        this.connection.close();
    }
}