基于MySQL的创建＜resultMap＞和查询条件＜if test＞

基于MySQL的创建<resultMap>和查询条件<if test>

基于MySQL的创建<resultMap>和查询条件<if test>

SELECT  
    `ORDINAL_POSITION` as `a`,
-- @Data
-- @Schema(description = "货物管理表")
-- @TableName("lpg_cargo")
-- public class CargoEntity implements Serializable{

--     concat('@Data \n @Schema(description = "',`TABLE_COMMENT`,'") \n  @TableName("',`TABLE_NAME`, '")') as `aaa`,
--     concat('public class ', `TABLE_NAME_NEW`,'Entity  implements  Serializable{ ') as `bbb`,

--    @Schema(description = "货物名称")
--    private String cargoName 

--     `TABLE_COMMENT`,
--     `TABLE_NAME`,
--     `TABLE_NAME_NEW`,
    'SELECT' AS `SELECT`,
    `COLUMN_NAME`,
    'FROM' AS `from`,
    concat(`TABLE_SCHEMA`,'.',`TABLE_NAME`) AS `from_table`,
    `TABLE_SCHEMA`,
    `TABLE_NAME`,
    `COLUMN_NAME`,
    `CamelCaseColumn`,
    `DATA_TYPE`,
   
    /* ========= */
    concat('<result property="', `CamelCaseColumn` ,'" column="', COLUMN_NAME ,'"/>') as resultMap,
    /* ========= */
    CASE WHEN `DATA_TYPE` = 'String'
    	THEN 
    	/* ========= */
    	concat( /**/
	    	'<if test="query.', `CamelCaseColumn`,  '!= null',
		    	/**/
	    		' and query.', `CamelCaseColumn`,' != ''''">\n',
	    		/**/
				' and ',`COLUMN_NAME`,' = #{query.', `CamelCaseColumn`,'}\n' 
			 	/**/
			'</if>' )
    	/* ========= */
    	
    ELSE
    /* ========= */
     concat( /**/
	    	'<if test="query.', `CamelCaseColumn`,  '!= null">\n',
	    		/**/
				' and ',`COLUMN_NAME`,' = #{query.', `CamelCaseColumn`,'}\n' 
			 	/**/
			'</if>' )
    /* ========= */
    END AS `if_test`,
    
    

/* ==============================  */
  1 AS tt
/* ==============================  */
/* ==============================  */
/* ==============================  */
/* ==============================  */
/* ==============================  */    
from
    (
    /**/
    select 
        ORDINAL_POSITION,
        TABLE_COMMENT,
        TABLE_SCHEMA,
        TABLE_NAME,
        COLUMN_NAME,
         replace(replace(replace(replace(replace(replace(replace( replace(replace( replace(replace(replace(replace(replace(replace(  replace(  replace( replace( replace(replace(replace( replace( replace( replace( replace( replace( replace(TABLE_NAME, '_a', 'A'), '_b', 'B'), '_c', 'C'), '_d', 'D'), '_e', 'E'), '_f', 'F'), '_g', 'G')
        , '_h', 'H'), '_i', 'I'), '_j', 'J'), '_k', 'K'), '_l', 'L'), '_m', 'M'), '_n', 'N'), '_o', 'O'), '_p', 'P'), '_q', 'Q'), '_r', 'R'), '_s', 'S'), '_t', 'T'), '_u', 'U')
       , '_v', 'V'), '_w', 'W'), '_x', 'X'), '_y', 'Y'), '_z', 'Z'), '_', '') as `TABLE_NAME_NEW`,
         'private' as `prefix`,    
         replace(replace(replace(replace(replace(replace(replace( replace(replace( replace(replace(replace(replace(replace(replace(  replace(  replace( replace( replace(replace(replace( replace( replace( replace( replace( replace( replace(COLUMN_NAME, '_a', 'A'), '_b', 'B'), '_c', 'C'), '_d', 'D'), '_e', 'E'), '_f', 'F'), '_g', 'G')
        , '_h', 'H'), '_i', 'I'), '_j', 'J'), '_k', 'K'), '_l', 'L'), '_m', 'M'), '_n', 'N'), '_o', 'O'), '_p', 'P'), '_q', 'Q'), '_r', 'R'), '_s', 'S'), '_t', 'T'), '_u', 'U')
       , '_v', 'V'), '_w', 'W'), '_x', 'X'), '_y', 'Y'), '_z', 'Z'), '_', '') as `CamelCaseColumn`,
      
       CASE upper(DATA_TYPE)
          WHEN 'VARCHAR' THEN 'String'
          WHEN 'CHAR' THEN 'String'
          WHEN 'TEXT' THEN 'String'
          WHEN 'INT' THEN 'Integer'
          WHEN 'TINYINT' THEN 'Integer'
          WHEN 'SMALLINT' THEN 'Integer'
          WHEN 'MEDIUMINT' THEN 'Integer'
          WHEN 'BOOLEAN' THEN 'Integer'
          WHEN 'BIGINT' THEN 'Long'
          WHEN 'INTEGER' THEN 'Long'
          WHEN 'ID' THEN 'Long'
          WHEN 'FLOAT' THEN 'Float'
          WHEN 'DOUBLE' THEN 'Double'
          WHEN 'DECIMAL' THEN 'BigDecimal'
          WHEN 'BIT' THEN 'Boolean'
          /*WHEN 'BLOB' THEN 'byte[]'*/
          WHEN 'BLOB' THEN 'byte[]'
          WHEN 'DATE' THEN 'Date'
          WHEN 'YEAR' THEN 'Date'
          WHEN 'TIME' THEN 'Time'
         /* WHEN 'DATETIME' THEN 'Timestamp'*/
         /* WHEN 'TIMESTAMP' THEN 'Timestamp'*/
          WHEN 'DATETIME' THEN 'Date'
          WHEN 'TIMESTAMP' THEN 'Date'
          ELSE 'String ' end as  `DATA_TYPE`,
          ';' as `suffix`,
          COLUMN_COMMENT
    from (
    /* === */
        select 
            `tables`.TABLE_SCHEMA,
            `tables`.TABLE_NAME,
            `tables`.TABLE_COMMENT,
            `columns`.ORDINAL_POSITION,
            -- `columns`.TABLE_NAME,
            `columns`.COLUMN_NAME,
            `columns`.DATA_TYPE,
            `columns`.COLUMN_COMMENT 
        from INFORMATION_SCHEMA.Tables as `tables`
        left join  INFORMATION_SCHEMA.COLUMNS  as `columns`
          on  `columns`.TABLE_NAME = `tables`.TABLE_NAME
/* ==============================  */
/* ==============================  */
/* ==============================  */
/* ==============================  */
        WHERE
             	`tables`.TABLE_SCHEMA = '数据库'
		and `tables`.TABLE_NAME = '表名称'
/* ==============================  */
/* ==============================  */
/* ==============================  */
/* ==============================  */            
        order by `columns`.ORDINAL_POSITION    
    /* === */
    )as tmp
    order by ORDINAL_POSITION    
    /**/
)as ttt
order by ORDINAL_POSITION