org.dromara.hutool.db.dialect.impl

Class HanaDialect

java.lang.Object

org.dromara.hutool.db.dialect.impl.AnsiSqlDialect

org.dromara.hutool.db.dialect.impl.HanaDialect

All Implemented Interfaces:

Serializable, Dialect

public class HanaDialect
extends AnsiSqlDialect

Hana数据库方言

Author:

daoyou.dev

See Also:

Serialized Form

Field Summary

Fields inherited from class org.dromara.hutool.db.dialect.impl.AnsiSqlDialect

dbConfig, quoteWrapper

Constructor Summary

Constructors

Constructor and Description
HanaDialect(DbConfig config) 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。

Methods inherited from class org.dromara.hutool.db.dialect.impl.AnsiSqlDialect

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.dromara.hutool.db.dialect.Dialect

psForCount, psForCount

Constructor Detail

HanaDialect

public HanaDialect(DbConfig config)

构造

Parameters:

config - 数据库配置对象

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

psForUpsert

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

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);
 

Specified by:

psForUpsert in interface Dialect

Overrides:

psForUpsert in class AnsiSqlDialect

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:

DbException - SQL 执行异常