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gplanchat merged 2 commits into from
Jun 21, 2023
Merged

SQL: "from" for multiple values #46

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6b8e4b7
explain how to use the option "from" in SQL to bind an unknown number…
clemzarch Jun 20, 2023
1b6350d
Merge branch 'master' into feature/sql-from-multiple
gplanchat Jun 21, 2023
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38 changes: 38 additions & 0 deletions content/connectivity/sql/_index.en.md
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ weight: 9
- [Building a ConditionalLoader](#building-a-conditionalloader)
- [Advanced usage](#advanced-usage)
- [Using params in your queries](#using-params-in-your-queries)
- [Using an unknown number of parameters](#using-an-unknown-number-of-parameters)
- [Creating before and after queries](#creating-before-and-after-queries)

---
Expand Down Expand Up @@ -237,6 +238,43 @@ sql:
# ...
```

### Using an unknown number of parameters

In some cases, you may not know in advance how many parameters you will need to enter,
for example if you are searching using an `IN` with many values.

Using `from` instead of `value` will bind as many parameters as there are values in the path.

And use [the expression `inSql(path, parameter_name)`](../../feature/expression-language/satellite-expression-functions/#list-of-available-functions) to prepare the values in the query.

```yaml
sql:
loader:
query: '@="SELECT * FROM category WHERE id " ~ inSql(input["codes_list"], "identifier") ~ "'
parameters:
identifier:
from: '@=input["codes_list"]'
# ...
```

If at runtime there are 4 values under `[codes_list]`, this would be equivalent to writing:

```yaml
sql:
loader:
query: 'SELECT * FROM category WHERE id IN (:identifier_0, :identifier_1, :identifier_2, :identifier_3)'
parameters:
identifier_0:
value: '@=input["codes_list"][0]'
identifier_1:
value: '@=input["codes_list"][1]'
identifier_2:
value: '@=input["codes_list"][2]'
identifier_3:
value: '@=input["codes_list"][3]'
# ...
```

### Creating before and after queries

In some cases, you may need to run queries in order to best prepare for the execution of your pipeline.
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15 changes: 8 additions & 7 deletions content/feature/expression-language/satellite-expression-functions/_index.en.md
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Expand Up @@ -38,10 +38,11 @@ foo: '@=env("MY_ENVIRONMENT_VARIABLE")'

## List of available functions

| Name | Description |
|----------------------------------------------------|-----------------------------------------------------|
| env(`string` name): `string`|`false` | Gets the value of an environment variable |
| envAsFile(`string` name): `string` | Create a file whose name is an environment variable |
| file(`string` name): `string` | Create a file |
| base64Decode(`string` name): `string`|`false` | Decodes data encoded with Base64 |
| temporaryFile(`string` name): `resource` | Create a temporary file |
| Name | Description |
|-------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| env(`string` name): `string|false` | Gets the value of an environment variable |
| envAsFile(`string` name): `string` | Create a file whose name is an environment variable |
| file(`string` name): `string` | Create a file |
| base64Decode(`string` name): `string|false` | Decodes data encoded with Base64 |
| temporaryFile(`string` name): `resource` | Create a temporary file |
| inSql(`array` path, `string` parameterName): `string` | Writes "IN (...)" with as many parameters as there are values under `path`, in the format: `:parameterName_0`, `:parameterName_1`... To be used in a SQL query [when searching among an unknown number of values](../../../connectivity/sql/#using-an-unknown-number-of-parameters). |