51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
package dbutils
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import (
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"fmt"
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"strings"
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)
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// JSONEach returns JSON_EACH SQLite string expression with
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// some normalizations for non-json columns.
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func JSONEach(column string) string {
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// note: we are not using the new and shorter "if(x,y)" syntax for
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// compatability with custom drivers that use older SQLite version
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return fmt.Sprintf(
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`json_each(CASE WHEN iif(json_valid([[%s]]), json_type([[%s]])='array', FALSE) THEN [[%s]] ELSE json_array([[%s]]) END)`,
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column, column, column, column,
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)
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}
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// JSONArrayLength returns JSON_ARRAY_LENGTH SQLite string expression
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// with some normalizations for non-json columns.
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//
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// It works with both json and non-json column values.
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//
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// Returns 0 for empty string or NULL column values.
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func JSONArrayLength(column string) string {
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// note: we are not using the new and shorter "if(x,y)" syntax for
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// compatability with custom drivers that use older SQLite version
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return fmt.Sprintf(
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`json_array_length(CASE WHEN iif(json_valid([[%s]]), json_type([[%s]])='array', FALSE) THEN [[%s]] ELSE (CASE WHEN [[%s]] = '' OR [[%s]] IS NULL THEN json_array() ELSE json_array([[%s]]) END) END)`,
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column, column, column, column, column, column,
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)
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}
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// JSONExtract returns a JSON_EXTRACT SQLite string expression with
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// some normalizations for non-json columns.
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func JSONExtract(column string, path string) string {
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// prefix the path with dot if it is not starting with array notation
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if path != "" && !strings.HasPrefix(path, "[") {
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path = "." + path
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}
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return fmt.Sprintf(
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// note: the extra object wrapping is needed to workaround the cases where a json_extract is used with non-json columns.
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"(CASE WHEN json_valid([[%s]]) THEN JSON_EXTRACT([[%s]], '$%s') ELSE JSON_EXTRACT(json_object('pb', [[%s]]), '$.pb%s') END)",
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column,
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column,
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path,
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column,
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path,
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)
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}
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