目标样式：

public static final String FIELD_PURCHASE_ORDER_HD_ID = "purchaseOrderHdId";
public static final String FIELD_PURCHASE_ORDER_NUM = "purchaseOrderNum";
public static final String FIELD_PURCHASE_COMPANY_ID = "purchaseCompanyId";
public static final String FIELD_PURCHASE_ORG_ID = "purchaseOrgId";
public static final String FIELD_PURCHASE_AGENT_ID = "purchaseAgentId";
public static final String FIELD_PURCHASE_ORDER_TYPE = "purchaseOrderType";
public static final String FIELD_SUPPLIER_COMPANY_ID = "supplierCompanyId";
public static final String FIELD_SUPPLIER_ADDRESS = "supplierAddress";
public static final String FIELD_ORDER_RELEASE_DATE = "orderReleaseDate";
public static final String FIELD_TAX_EXCLUDED_AMOUNT = "taxExcludedAmount";
public static final String FIELD_ORDER_SUMMARY = "orderSummary";
public static final String FIELD_ORDER_STATUS = "orderStatus";
public static final String FIELD_DELIVERY_FEEDBACK_DATE = "deliveryFeedbackDate";
@Id
@GeneratedValue
@ApiModelProperty("表ID")
private Long purchaseOrderHdId;
@ApiModelProperty("采购订单编号")
private String purchaseOrderNum;
@ApiModelProperty("采购方公司hpfm_company.company_id")
private Long purchaseCompanyId;
@ApiModelProperty("采购组织hpfm_purchase_organization.purchase_org_id")
private Long purchaseOrgId;
@ApiModelProperty("采购员hpfm_purchase_agent.purchase_agent_id")
private Long purchaseAgentId;
@ApiModelProperty("订单类型")
private String purchaseOrderType;
@ApiModelProperty("供应方公司hpfm_company.company_id")
private Long supplierCompanyId;
@ApiModelProperty("供应商地址")
private String supplierAddress;
@ApiModelProperty("发布日期")
private Date orderReleaseDate;
@ApiModelProperty("不含税总全额")
private BigDecimal taxExcludedAmount;
@ApiModelProperty("订单摘要")
private String orderSummary;
@ApiModelProperty("订单状态")
private String orderStatus;
@ApiModelProperty("交期反馈日期")
private Date deliveryFeedbackDate;
public Long getPurchaseOrderHdId(){ return purchaseOrderHdId;}

public void setPurchaseOrderHdId(Long purchaseOrderHdId){this.purchaseOrderHdId = purchaseOrderHdId;}

public String getPurchaseOrderNum(){ return purchaseOrderNum;}

public void setPurchaseOrderNum(String purchaseOrderNum){this.purchaseOrderNum = purchaseOrderNum;}

public Long getPurchaseCompanyId(){ return purchaseCompanyId;}

public void setPurchaseCompanyId(Long purchaseCompanyId){this.purchaseCompanyId = purchaseCompanyId;}

public Long getPurchaseOrgId(){ return purchaseOrgId;}

public void setPurchaseOrgId(Long purchaseOrgId){this.purchaseOrgId = purchaseOrgId;}

public Long getPurchaseAgentId(){ return purchaseAgentId;}

public void setPurchaseAgentId(Long purchaseAgentId){this.purchaseAgentId = purchaseAgentId;}

public String getPurchaseOrderType(){ return purchaseOrderType;}

public void setPurchaseOrderType(String purchaseOrderType){this.purchaseOrderType = purchaseOrderType;}

public Long getSupplierCompanyId(){ return supplierCompanyId;}

public void setSupplierCompanyId(Long supplierCompanyId){this.supplierCompanyId = supplierCompanyId;}

public String getSupplierAddress(){ return supplierAddress;}

public void setSupplierAddress(String supplierAddress){this.supplierAddress = supplierAddress;}

public Date getOrderReleaseDate(){ return orderReleaseDate;}

public void setOrderReleaseDate(Date orderReleaseDate){this.orderReleaseDate = orderReleaseDate;}

public BigDecimal getTaxExcludedAmount(){ return taxExcludedAmount;}

public void setTaxExcludedAmount(BigDecimal taxExcludedAmount){this.taxExcludedAmount = taxExcludedAmount;}

public String getOrderSummary(){ return orderSummary;}

public void setOrderSummary(String orderSummary){this.orderSummary = orderSummary;}

public String getOrderStatus(){ return orderStatus;}

public void setOrderStatus(String orderStatus){this.orderStatus = orderStatus;}

public Date getDeliveryFeedbackDate(){ return deliveryFeedbackDate;}

public void setDeliveryFeedbackDate(Date deliveryFeedbackDate){this.deliveryFeedbackDate = deliveryFeedbackDate;}

下划线转小驼峰方法

CREATE DEFINER=`root`@`localhost` FUNCTION `under_line_to_lower_camel`(`column_name` varchar(4000)) RETURNS varchar(4000) CHARSET utf8
BEGIN
	DECLARE pos int(25);
	DECLARE res VARCHAR(255);
	DECLARE tmp VARCHAR(255);
	set pos = LOCATE('_',column_name);
	-- LOCATE(subcolumn_name,column_name)：查到返回从1开始的下标。
	WHILE pos > 0
	DO
		set column_name = CONCAT(SUBSTR(column_name,1,pos-1),UPPER(SUBSTR(column_name,pos+1,1)),SUBSTR(column_name FROM pos+2));
		-- SUBcolumn_name(column_name,pos,len) 从pos开始取len个字符，
		-- SUBcolumn_name(column_name FROM pos) 取pos开始的后面所有字符。
		set pos = LOCATE('_',column_name);
	END WHILE;
	RETURN column_name;
END

小驼峰转大驼峰方法

CREATE DEFINER=`root`@`localhost` FUNCTION `lower_camel_to_upper_camel`(`column_name` varchar(4000)) RETURNS varchar(4000) CHARSET utf8
BEGIN
	RETURN CONCAT( UPPER(SUBSTR(column_name,1,1)), SUBSTR(column_name FROM 2) );
END

mysql类型转java类型

CREATE DEFINER=`root`@`localhost` FUNCTION `get_java_type`(`mysql_type` varchar(400)) RETURNS varchar(400) CHARSET utf8
BEGIN
	declare java_type VARCHAR(400);
	case mysql_type
		when 'varchar' then	set java_type = 'String';
		WHEN 'bigint' then	set java_type = 'Long';
		WHEN 'int' then	set java_type = 'Long';
		WHEN 'Tinyint' then	set java_type = 'Integer';
		WHEN 'datetime' then	set java_type = 'Date';
		WHEN 'date' then	set java_type = 'Date';
		WHEN 'char' then	set java_type = 'String';
		WHEN 'decimal' then	set java_type = 'BigDecimal';
		ELSE set java_type = 'error';
		END case;
	RETURN java_type;
END

生成get/set方法

CREATE DEFINER=`root`@`localhost` FUNCTION `generator_get_set`(`column_name` varchar(4000),java_type VARCHAR(300)) RETURNS varchar(4000) CHARSET utf8
BEGIN
	DECLARE set_func VARCHAR(4000);
	declare get_func VARCHAR(4000);
	declare column_name_u VARCHAR(4000);
	set column_name_u = CONCAT( UPPER(SUBSTR(column_name,1,1)), SUBSTR(column_name FROM 2) );
	SET set_func = concat("public void set",column_name_u,"(",java_type," ",column_name,"){this.",column_name," = ",column_name,";}\n\n");
	SET get_func = concat("public ",java_type," get",column_name_u,"(){ return ",column_name,";}\n\n");
	RETURN concat(get_func,set_func);
END

生成java代码：

CREATE DEFINER=`root`@`localhost` PROCEDURE `generator`()
BEGIN
	-- 'hpfm_purchase_order_hd' , srm_order
	declare my_column_name varchar(255);
	declare java_column_name varchar(255);
	declare my_column_comment varchar(255);
	declare my_column_key varchar(255);
	declare my_extra varchar(255);
	declare mysql_type varchar(255);
	declare final_var VARCHAR(10000);	-- final常量生成。
	declare var_declare varchar(10000);			-- 字段生成。
	declare get_and_set varchar(20000);
	declare done int default false;
	-- 从系统中选出该表中所有列的列名，注释，类型,键，增长类型。
	declare cur cursor for select COLUMN_NAME,COLUMN_COMMENT,DATA_TYPE,COLUMN_KEY,EXTRA from information_schema.columns where TABLE_NAME = 'hpfm_purchase_order_hd' and TABLE_SCHEMA = 'srm_order';
	declare continue HANDLER for not found set done = true;
	open cur;
	set var_declare = '';
	set final_var = '';
	set get_and_set = '';
	read_loop:loop
		fetch cur into my_column_name,my_column_comment,mysql_type,my_column_key,my_extra;
		if done then
			leave read_loop;
		end if;
		-- 除who，version
		if my_column_name != 'creation_date' AND my_column_name != 'created_by' AND my_column_name != 'last_updated_by' AND my_column_name != 'last_update_date' AND my_column_name != 'object_version_number' THEN
			-- 获取对应java变量名
			set java_column_name = under_line_to_lower_camel(my_column_name);
			-- 处理主键
			if my_column_key = 'PRI' and my_extra = 'auto_increment' THEN
				set var_declare = CONCAT(var_declare,'@Id\n@GeneratedValue\n');
			end if;
			-- 拼接ApiModel与变量声明
			set var_declare = CONCAT(var_declare,'@ApiModelProperty("',my_column_comment,'")\nprivate ',get_java_type(mysql_type)," ",java_column_name,";\n");
			set final_var = CONCAT(final_var,'public static final String FIELD_',UPPER(my_column_name),' = "',java_column_name,'";\n');
			-- 获取get/set方法
			set get_and_set = concat(get_and_set,generator_get_set(java_column_name,get_java_type(mysql_type)));
			
		END IF;
	end loop;
	-- 输出结果
	SELECT concat(final_var,var_declare,get_and_set)entity;
	close cur;
	
END