类别：: 转换函数

TO_VARIANT¶

将任何值转换为 VARIANT 值或 NULL（如果输入为 NULL）。

语法¶

TO_VARIANT( <expr> )

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实参¶

expr: 任何数据类型的表达式。

使用说明¶

TO_VARIANT 函数不能直接在 INSERT 语句中使用。请改用 INSERT INTO ... SELECT...。示例部分说明了如何执行此操作。

示例¶

使用 TO_VARIANT 将值插入到表中。

CREATE OR REPLACE TABLE to_variant_example (
  v_varchar   VARIANT,
  v_number    VARIANT,
  v_timestamp VARIANT,
  v_array     VARIANT,
  v_object    VARIANT);

INSERT INTO to_variant_example (v_varchar, v_number, v_timestamp, v_array, v_object)
  SELECT
    TO_VARIANT('Skiing is fun!'),
    TO_VARIANT(3.14),
    TO_VARIANT('2024-01-25 01:02:03'),
    TO_VARIANT(ARRAY_CONSTRUCT('San Mateo', 'Seattle', 'Berlin')),
    TO_VARIANT(PARSE_JSON(' { "key1": "value1", "key2": "value2" } '));

SELECT * FROM to_variant_example;

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+------------------+----------+-----------------------+----------------+---------------------+
| V_VARCHAR        | V_NUMBER | V_TIMESTAMP           | V_ARRAY        | V_OBJECT            |
|------------------+----------+-----------------------+----------------+---------------------|
| "Skiing is fun!" | 3.14     | "2024-01-25 01:02:03" | [              | {                   |
|                  |          |                       |   "San Mateo", |   "key1": "value1", |
|                  |          |                       |   "Seattle",   |   "key2": "value2"  |
|                  |          |                       |   "Berlin"     | }                   |
|                  |          |                       | ]              |                     |
+------------------+----------+-----------------------+----------------+---------------------+