HQL语句中的类型转换

最新推荐文章于 2024-01-26 17:57:50 发布

转载最新推荐文章于 2024-01-26 17:57:50 发布 · 571 阅读

文章标签：

#java #数据库

本文介绍如何在SQL中进行字符串到整数、日期类型的转换，并展示了如何计算两个日期之间的年份差值。此外，还提供了一份详细的Java、Hibernate与SQL Server数据类型之间的映射表。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

字符串转整行：cast(string1 as integer)

转日期：cast(string2 as date)

日期年差值：cast(year('2012-04-18')-year(e.birthday) as integer

" SELECT new cn.enn.hr.empleave.pojo.EmpQuit(" +
      "q.applyusername,"+
      "cast(q.applyuserid as integer),"+
      "q.companyname,"+
      "q.deptname,"+
      "q.applyposition,"+
      "q.gender,"+
      "(select cast(year('2012-04-18')-year(e.birthday) as integer) from TEmployee e where e.id=q.applyuserid) as age ,"+
      "cast(q.enterdate as date),"+
      "q.applylevel,"+
      "(select cast(e2.contractdatebegin as date) from TEmployeeAtt e2 where e2.employeeid=q.applyuserid) as contractdatebegin ,"+
      "cast(q.employeeenddate as date),"+
      "q.quittype,"+
      "cast(q.status as integer),"+
      "q.statusname,"+
      "cast(q.starttime as date) ) ";

java,hibernate和sql server对应的数据类型表

java hibernate sqlserver

byte、java.lang.Byte	byte	TINYINT
short、java.lang.Short	short	SMALLINT
int、java.lang.Integer	integer	INGEGER
long、java.lang.Long	long	BIGINT
float、java.lang.Float	float	FLOAT
double、java.lang.Double	double	DOUBLE
java.math.BigDecimal	big_decimal	NUMERIC
char、java.lang.Character	character	CHAR(1)
boolean、java.lang.Boolean	boolean	BIT
java.lang.String	string	VARCHAR
boolean、java.lang.Boolean	yes_no	CHAR(1)('Y'或'N')
boolean、java.lang.Boolean	true_false	CHAR(1)('Y'或'N')
java.util.Date、java.sql.Date	date	DATE
java.util.Date、java.sql.Time	time	TIME
java.util.Date、java.sql.Timestamp	timestamp	TIMESTAMP
java.util.Calendar	calendar	TIMESTAMP
java.util.Calendar	calendar_date	DATE
byte[]	binary	VARBINARY、BLOB
java.lang.String	text	CLOB
java.io.Serializable	serializable	VARBINARY、BLOB
java.sql.Clob	clob	CLOB
java.sql.Blob	blob	BLOB
java.lang.Class	class	VARCHAR
java.util.Locale	locale	VARCHAR
java.util.TimeZone	timezone	VARCHAR
java.util.Currency	currency	VARCHAR