125 lines
2.3 KiB
Markdown
125 lines
2.3 KiB
Markdown
REPLACE
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============================
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描述
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-----------
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该语句用于替换一个或多个记录到表。如果没有主键或唯一键冲突则插入记录，如果存在冲突则先删除冲突记录再插入新的记录。
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格式
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-----------
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```javascript
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replace_stmt:
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REPLACE [INTO] table_factor [PARTITION (partition_name_list)] [(column_name_list)]
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{VALUES | VALUE} column_value_lists;
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partition_name_list:
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partition_name [, partition_name ...]
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column_name_list:
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column_name [, column_name ...]
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column_value_lists:
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(column_value_list) [, (column_value_list) ...]
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column_value_list:
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column_value [, column_value ...]
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column_value:
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{expression | DEFAULT}
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```
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### 参数解释
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| **参数** | **描述** |
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|---------------------|-----------|
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| table_factor | 替换的表名 |
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| column_name_list | 指定替换数据的列 |
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| partition_name_list | 替换表指定的分区名 |
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### 示例
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本示例基于如下表定义。
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```javascript
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OceanBase(admin@test)>create table test (c1 int primary key, c2 varchar(40));
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Query OK, 0 rows affected (0.23 sec)
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```
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1. 替换 test 表中的行一和行二的值分别为 'hello alibaba' 和 'hello ob'。
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```javascript
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OceanBase(admin@test)>REPLACE INTO test VALUES (1, 'hello alibaba'),(2, 'hello ob');
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Query OK, 2 rows affected (0.01 sec)
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Records: 2 Duplicates: 0 Warnings: 0
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```
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2. 查看 test 表中的行一和行二内容。
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```javascript
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OceanBase(admin@test)>SELECT * FROM test;
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+----+---------------+
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| c1 | c2 |
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+----+---------------+
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| 1 | hello alibaba |
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| 2 | hello ob |
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+----+---------------+
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2 rows in set (0.00 sec)
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```
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3. 替换表 test 中的行三和行二的内容分别为 'hello alibaba' 和 'hello oceanbase'。
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```javascript
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OceanBase(admin@test)>REPLACE INTO test VALUES (3, 'hello alibaba'),(2, 'hello oceanbase');
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Query OK, 3 rows affected (0.00 sec)
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Records: 2 Duplicates: 1 Warnings: 0
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```
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4. 查看 test 表中的行一、行二和行三的内容。
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```javascript
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OceanBase(admin@test)>SELECT * FROM test;
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+----+-----------------+
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| c1 | c2 |
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+----+-----------------+
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| 1 | hello alibaba |
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| 2 | hello oceanbase |
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| 3 | hello alibaba |
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+----+-----------------+
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3 rows in set (0.00 sec)
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```
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