cn.hutool.db.dialect.impl

Class HanaDialect

java.lang.Object

cn.hutool.db.dialect.impl.AnsiSqlDialect

cn.hutool.db.dialect.impl.HanaDialect

All Implemented Interfaces:

Dialect, Serializable

public class HanaDialect
extends AnsiSqlDialect

Hana数据库方言

Author:

daoyou.dev

See Also:

Serialized Form

Field Summary

Fields inherited from class cn.hutool.db.dialect.impl.AnsiSqlDialect

wrapper

Constructor Summary

Constructors

Constructor and Description
HanaDialect() 构造

Method Summary

Modifier and Type	Method and Description
String	dialectName() 方言名
PreparedStatement	psForUpsert(Connection conn, Entity entity, String... keys) 构建用于upsert的PreparedStatement。
protected SqlBuilder	wrapPageSql(SqlBuilder find, Page page) 根据不同数据库在查询SQL语句基础上包装其分页的语句 各自数据库通过重写此方法实现最小改动情况下修改分页语句

Methods inherited from class cn.hutool.db.dialect.impl.AnsiSqlDialect

getWrapper, psForDelete, psForFind, psForInsert, psForInsertBatch, psForPage, psForPage, psForUpdate, setWrapper

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface cn.hutool.db.dialect.Dialect

psForCount, psForCount

Constructor Detail

HanaDialect

public HanaDialect()

构造

Method Detail

dialectName

public String dialectName()

Description copied from interface: Dialect

方言名

Specified by:

dialectName in interface Dialect

Overrides:

dialectName in class AnsiSqlDialect

Returns:

方言名

wrapPageSql

protected SqlBuilder wrapPageSql(SqlBuilder find,
                                 Page page)

Description copied from class: AnsiSqlDialect

根据不同数据库在查询SQL语句基础上包装其分页的语句
各自数据库通过重写此方法实现最小改动情况下修改分页语句

Overrides:

wrapPageSql in class AnsiSqlDialect

Parameters:

find - 标准查询语句

page - 分页对象

Returns:

分页语句

psForUpsert

public PreparedStatement psForUpsert(Connection conn,
                                     Entity entity,
                                     String... keys)
                              throws SQLException

构建用于upsert的PreparedStatement。 SAP HANA 使用 MERGE INTO 语法来实现 UPSERT 操作。

生成 SQL 语法为：

     MERGE INTO demo AS target
     USING (SELECT ? AS a, ? AS b, ? AS c FROM DUMMY) AS source
     ON target.id = source.id
     WHEN MATCHED THEN
         UPDATE SET target.a = source.a, target.b = source.b, target.c = source.c
     WHEN NOT MATCHED THEN
         INSERT (a, b, c) VALUES (source.a, source.b, source.c);
 

Parameters:

conn - 数据库连接对象

entity - 数据实体类（包含表名）

keys - 主键字段数组，通常用于确定匹配条件（联合主键）

Returns:

PreparedStatement

Throws:

SQLException - SQL 执行异常