表转换Java类

将匈牙利命名法（some_columns）转驼峰（SomeClass or someFields）的函数:
delimiter $$
create function `to_camel`(src varchar(255), lowercase boolean) returns varchar(255) charset utf8
begin
    declare temp varchar(255);
    declare buffer varchar(255);
    declare i int;
    declare lasti int;
    declare len int;
    set temp = concat(src, '_');
    set buffer = '';
    set i = 1;
    set lasti = 1;
    set len = length(temp);
    while i <= len do
        if substring(temp, i, 1) = '_' then
    set temp =concat(substring(temp, 1, lasti - 1), upper(substring(temp, lasti, 1)),substring(temp, lasti + 1));
    set buffer =concat(buffer, substring(temp, lasti, i - lasti));
    set lasti = i + 1;
        end if;
        set i = i + 1;
    end while;
    if lowercase then
        set buffer =concat(lower(substring(buffer, 1, 1)), substring(buffer, 2));
    end if;
    return buffer;
    end $$
delimiter ;
将db_type转JavaType的函数:
delimiter $$
create function `to_java_type`(sqltype varchar(255))returns varchar(255) charset utf8
begin
    declare javatype varchar(255);
    set javatype = '';
    case sqltype
        when 'bigint' then
            set javatype = 'Long';
        when 'binary' then
            set javatype = 'Integer';
        when 'bit' then
            set javatype = 'Boolean';
        when 'blob' then
            set javatype = 'Byte[]';
        when 'bool' then
            set javatype = 'Boolean';
        when 'boolean' then
            set javatype = 'Boolean';
        when 'char' then
            set javatype = 'String';
        when 'date' then
            set javatype = 'Date';
        when 'datetime' then
            set javatype = 'Date';
        when 'decimal' then
            set javatype = 'Double';
        when 'double' then
            set javatype = 'Double';
        when 'enum' then
            set javatype = 'Object';
        when 'float' then
            set javatype = 'Float';
        when 'int' then
            set javatype = 'Integer';
        when 'longblog' then
            set javatype = 'Byte[]';
        when 'longtext' then
            set javatype = 'String';
        when 'mediumblob' then
            set javatype = 'Byte[]';
        when 'mediumint' then
            set javatype = 'Integer';
        when 'mediumtext' then
            set javatype = 'String';
        when 'numeric' then
            set javatype = 'Double';
        when 'real' then
            set javatype = 'Boolean';
        when 'set' then
            set javatype = 'Object';
        when 'smallint' then
            set javatype = 'Integer';
        when 'text' then
            set javatype = 'String';
        when 'time' then
            set javatype = 'Date';
        when 'timestamp' then
            set javatype = 'Date';
        when 'tinyblob' then
            set javatype = 'Byte[]';
        when 'tinyint' then
            set javatype = 'Integer';
        when 'tinytext' then
            set javatype = 'String';
        when 'varbinary' then
            set javatype = 'Integer';
        when 'varchar' then
            set javatype = 'String';
        when 'year' then
            set javatype = 'Date';
    end case;
    if javatype = '' then
        set javatype = 'Object';
    end if;
    return javatype;
    end $$
delimiter ;
将表转换成Java类（仅含熟悉）的存储过程，getters和setters需要自己生成:
delimiter $$
create procedure `table_to_class`(tablename varchar(255))
begin
        select concat('public class ',substring(to_camel(tablename, false),2), ' implements Serializable {') as 'src'
        union all
        select concat('\tprivate ',to_java_type(data_type), ' ', to_camel(column_name, true), ';  //') from information_schema.columns where table_name = tablename
        union all
        select concat('public ',substring(to_camel(tablename, false),2), '() {}')
        union all
        select '}';
    end $$
delimiter ;
使用方法:
call table_to_class('表名');

 

来源：oschina

链接：https://my.oschina.net/u/2333003/blog/4308530