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INSERT

描述

该语句用于添加一个或多个记录到表中。

格式

INSERT [IGNORE] [INTO] 
       single_table_insert 
       [ON DUPLICATE KEY UPDATE update_asgn_list]

single_table_insert:
    {dml_table_name values_clause
     | dml_table_name '(' ')' values_clause
     | dml_table_name '(' column_list ')' values_clause
     | dml_table_name SET update_asgn_list}
     
dml_table_name:
    tbl_name [PARTITION (partition_name,...)]

values_clause:
     {{VALUES | VALUE} ({expr | DEFAULT},...) [, ...]
      | select_stmt}

column_list
    column_name [, ...]

update_asgn_list:
     column_name = expr [, ...]

参数解释

参数

描述

IGNORE

在 INSERT 语句执行过程中发生的错误将会被忽略。

column_list

用于指定插入数据的列,同时插入多列时,用“,”隔开。

tbl_name

指定要插入的表名。

partition_name

插入表指定的分区名。

update_asgn_list

赋值语句,例如:“c1 = 2”

ON DUPLICATE KEY UPDATE

指定对重复主键或唯一键的处理。如果指定了 ON DUPLICATE KEY UPDATE,当要插入的主键或唯一键有重复时,会用配置值替换待插入的值;如果不指定 ON DUPLICATE KEY UPDATE,当要插入的主键或唯一键有重复时,插入报错。

示例

示例表及数据基于以下定义:

obclient>create table t1(c1 int primary key, c2 int) partition by key(c1) partitions 4;
Query OK, 0 rows affected (0.16 sec)

obclient>create table t2(c1 int primary key, c2 int);
Query OK, 0 rows affected (0.16 sec)
obclient>select * from t2;
+----+------+
| c1 | c2   |
+----+------+
|  1 |    1 |
|  2 |    2 |
|  3 |    3 |
|  4 |    4 |
+----+------+
4 rows in set (0.06 sec)
  • 向表 t1 中插入一行数数据。

obclient>insert into t1 values(1,1);
Query OK, 1 row affected (0.01 sec)

obclient>select * from t1;
+----+------+
| c1 | c2   |
+----+------+
|  1 |    1 |
+----+------+
1 row in set (0.04 sec)
  • 向表 t1 中插入多行数据。

obclient>insert t1 values(1,1),(2,default),(2+2,3*4);
Query OK, 3 rows affected (0.02 sec)
Records: 3  Duplicates: 0  Warnings: 0

obclient>select * from t1;
+----+------+
| c1 | c2   |
+----+------+
|  1 |    1 |
|  2 | NULL |
|  4 |   12 |
+----+------+
3 rows in set (0.02 sec)
  • 向表 t1 指定的 p0 分区插入单行数据。

obclient>insert into t1 partition(p0) (c1) values(5);
Query OK, 1 row affected (0.02 sec)
obclient>select * from t1 partition(p0);
+----+------+
| c1 | c2   |
+----+------+
|  5 | NULL |
+----+------+
1 row in set (0.01 sec)
  • 将表 t2 的查询结果作为数据插入表 t1。

obclient>insert into t1 select * from t2;
Query OK, 4 rows affected (0.02 sec)
Records: 4  Duplicates: 0  Warnings: 0

obclient>select * from t1;
+----+------+
| c1 | c2   |
+----+------+
|  1 |    1 |
|  2 |    2 |
|  3 |    3 |
|  4 |    4 |
+----+------+
4 rows in set (0.01 sec)
  • 向表 t1 中插入重复主键值时利用 ON DUPLICATE KEY UPDATE 功能进行值更新

obclient>insert into t1 values(1,1),(1,2) ON DUPLICATE KEY UPDATE c1=100;
Query OK, 3 rows affected (0.01 sec)
Records: 2  Duplicates: 1  Warnings: 0

obclient>select * from t1;
+-----+------+
| c1  | c2   |
+-----+------+
| 100 |    1 |
+-----+------+
1 row in set (0.02 sec)
  • 对可更新视图 v 的插入值

obclient>create view v as select * from t1;
Query OK, 0 rows affected (0.07 sec)
obclient>insert into v values(1,1);
Query OK, 1 row affected (0.01 sec)

obclient>select * from v;
+----+------+
| c1 | c2   |
+----+------+
|  1 |    1 |
+----+------+
1 row in set (0.02 sec)

注意事项

INSERT 语句不支持直接对子查询进行插入操作,比如:insert into (select * from t1) values(1, 1);