mysql增删改查

public class BookTypeDao {
　　增加
    public int bookTypeAdd(Connection con, BookType bookType) throws SQLException{
        String sql="insert into t_bookType values(null,?,?)";
        PreparedStatement pstmt=con.prepareStatement(sql);
        pstmt.setString(1, bookType.getBookTypeName());
        pstmt.setString(2, bookType.getBookTypeDesc());
        return pstmt.executeUpdate();
    }
　　查找
    public ResultSet bookTypeList(Connection con,BookType bookType) throws SQLException{
        StringBuffer sb=new StringBuffer("select * from t_bookType") ;
        if(StringUtil.isNotEmpty(bookType.getBookTypeName())){
            sb.append(" and bookTypeName like '%"+bookType.getBookTypeName()+"%'");
        }
        PreparedStatement pstmt=con.prepareStatement(sb.toString().replaceFirst("and", "where"));
        return pstmt.executeQuery();
    }
　　删除
    public int bookTypeDelete(Connection con,String id) throws SQLException{
        String sql="delete from t_bookType where id=?";
        PreparedStatement pstmt=con.prepareStatement(sql);
        pstmt.setString(1, id);
        return pstmt.executeUpdate();
        
        }
　　修改
    public int bookTypeModify(Connection con,BookType bookType) throws SQLException{
        String sql="update t_bookType set bookTypeName=?,bookTypeDesc=? where id=?";
        PreparedStatement pstmt=con.prepareStatement(sql);
        pstmt.setString(1, bookType.getBookTypeName());
        pstmt.setString(2, bookType.getBookTypeDesc());
        pstmt.setInt(3, bookType.getId());
        return pstmt.executeUpdate();
    }
}