JDBC 数据库连接工具类

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;


/**
 * 连接数据包装类
 *
 *
 */
public class BaseDao {

    public static final String DRIVER = "oracle.jdbc.driver.OracleDriver";
    public static final String URL = "jdbc:oracle:thin:@localhost:1521:orcl";
    public static final String USERNAME = "scott";
    public static final String PASSWORD = "tiger";

    /**
     * 连接数据
     *
     * @return conn
     */
    public Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName(DRIVER);
            conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }

    /**
     * 关闭连接对象
     *
     * @param conn
     *            连接对象
     * @param pstmt
     *            预编译对象
     * @param rs
     *            结果集
     */
    public void closeAll(Connection conn, PreparedStatement pstmt, ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
            }
            if (pstmt != null) {
                pstmt.close();
            }
            if (conn != null) {
                pstmt.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 增删改操作
     *
     * @param sql
     *            SQL命令
     * @param param
     *            参数
     * @return
     */
    public int executsQuery(String sql, String[] param) {
        int result = 0;
        Connection conn = null;
        PreparedStatement pstmt = null;
        try {
            conn = this.getConnection();
            pstmt = conn.prepareStatement(sql);
            if (param != null) {
                for (int i = 0; i < param.length; i++) {
                    pstmt.setString(i + 1, param[i]);
                }
            }
            result = pstmt.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            this.closeAll(conn, pstmt, null);
        }
        return result;
    }
}