JDBC 增删查改

public class MemberDaoImpl implements MemberDao {
    private Connection conn = null;
    public MemberDaoImpl(){
        this.conn=ConnCreate.getConnection("jdbc:mysql://localhost:3306/supermarket?"
                + "useUnicode=true&characterEncoding=utf8", "root", "");
    }
    @Override
    public int add(Member member) throws SQLException {
        PreparedStatement pst=null;
        int num=0;
        try{
            String sql="insert into member values(?,?,?,?)";
            pst=conn.prepareStatement(sql);//准备执行清单
            pst.setInt(1,member.getMemberid());
            pst.setString(2,member.getMembername());
            pst.setString(3,member.getOpendate());
            pst.setInt(4,member.getIntegral());
            pst.executeUpdate();//执行sql语句
        } finally {
            ConnCreate.close(conn, pst, null);//释放资源
            num++;
        }
        return num;
    }

    @Override
    public int update(Member member, int num) throws SQLException {
        PreparedStatement pst=null;
        int count=0;
        try{
            String sql = "update member set memberid=?,membername=?,opendate=?,integral=? where memberid=?";
            pst=conn.prepareStatement(sql);//准备执行清单
            pst.setInt(1,member.getMemberid());
            pst.setString(2,member.getMembername());
            pst.setString(3,member.getOpendate());
            pst.setInt(4,member.getIntegral());
            pst.setInt(5,num);
            pst.executeUpdate();//执行sql语句
        } finally {
            ConnCreate.close(conn, pst, null);//释放资源
            count++;
        }
        return count;
    }

    @Override
    public int delete(int num) throws SQLException {
        PreparedStatement st=null;
        int count=0;
        try {//获取执行语句
            String sql = "delete from member where memberid=?";
            st = conn.prepareStatement(sql);//创建执行语柄
            st.setInt(1,num);//准备执行清单
            st.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
                ConnCreate.close(null, st, null);//释放资源
                count++;
        }
        return count;
    }

    @Override
    public List<Member> query(int number) throws SQLException {
        List<Member> num=new LinkedList<Member>();
        Statement st=null;
        ResultSet rs = null;
        try{
            //创建执行句柄
            st = conn.createStatement();
            //执行sql语句
            rs = st.executeQuery("select * from Member where memberid="+number);
            while(rs.next()){
                Member c=new Member();
                c.setMemberid(rs.getInt(1));
                c.setMembername(rs.getString(2));
                c.setOpendate(rs.getString(3));
                c.setIntegral(rs.getInt(4));
                num.add(c);
            }
        } finally {
            ConnCreate.close(conn, st, rs);//释放资源
        }
        return num;
    }

    @Override
    public List<Member> queryAll() throws SQLException {
        List<Member> num=new LinkedList<Member>();
        Statement st=null;
        ResultSet rs = null;
        try{
            //创建执行句柄
            st = conn.createStatement();
            //执行sql语句
            rs = st.executeQuery("select * from Member ");
            while(rs.next()){
                Member c=new Member();
                c.setMemberid(rs.getInt(1));
                c.setMembername(rs.getString(2));
                c.setOpendate(rs.getString(3));
                c.setIntegral(rs.getInt(4));
                num.add(c);
            }
        } finally {
            ConnCreate.close(conn, st, rs);//释放资源
        }
        return num;
    }

    @Override
    public int updatein(int num, int num1) throws SQLException {
        PreparedStatement st=null;
        int count=0;
        try {//获取执行语句
            String sql = "update member set integral=integral+? where memberid=?";
            st = conn.prepareStatement(sql);//创建执行语柄
            st.setInt(1,num);//准备执行清单
            st.setInt(2,num1);
            st.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
                ConnCreate.close(null, st, null);//释放资源
                count++;
        }
        return count;
    }
    @Override
    public int updatein1(int num, int num1) throws SQLException {
        PreparedStatement st=null;
        int count=0;
        try {//获取执行语句
            String sql = "update storage set depositnum=depositnum-? where id=?";
            st = conn.prepareStatement(sql);//创建执行语柄
            st.setInt(1,num);//准备执行清单
            st.setInt(2,num1);
            st.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
                ConnCreate.close(null, st, null);//释放资源
                count++;
        }
        return count;
    }
    @Override
    public List<Member> queryjifen(int num1) throws SQLException {
        List<Member> num=new LinkedList<Member>();
        Statement st=null;
        ResultSet rs = null;
        try{
            //创建执行句柄
            st = conn.createStatement();
            //执行sql语句
            rs = st.executeQuery("select * from Member where integral>"+num1);
            while(rs.next()){
                Member c=new Member();
                c.setMemberid(rs.getInt(1));
                c.setMembername(rs.getString(2));
                c.setOpendate(rs.getString(3));
                c.setIntegral(rs.getInt(4));
                num.add(c);
            }
        } finally {
            ConnCreate.close(conn, st, rs);//释放资源
        }
        return num;
    }

}