src/main/java/com/hwua/erhai/jdbc/DBUtil.java

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package com.hwua.erhai.jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {
    public static void close(ResultSet rs, Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    public static void close(Statement stmt, Connection conn) {
        //调用上面重载的close方法即可,不需要传null
        close(null, stmt, conn);
    }

    public static void close(Statement stmt) {
        close(null, stmt, null);
    }

    public static void close(ResultSet rs, Statement stmt) {
        close(rs, stmt, null);
    }

    public static void close(Connection conn) {
        close(null, null, conn);
    }
}