表转换Java类

• Z时代
• 2024-01-10
• 分类：综合

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 $$
create procedure `table_to_class`(tablename varchar(255))
begin
        select concat("public class ",substring(to_camel(tablename, false),2), " implements Serializable {") as "src"
        union all
        select concat("	private ",to_java_type(data_type), " ", to_camel(column_name, true), ";  //") from information_schema.columns where table_name = tablename
        union all
        select concat("public ",substring(to_camel(tablename, false),2), "() {}")
        union all
        select "}";
    end $$
delimiter ;
使用方法:
call table_to_class("表名");

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