mirror of https://github.com/VinGarcia/ksql.git
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
package ksql
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import (
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"context"
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"encoding/json"
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"fmt"
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"reflect"
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)
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// This type was created to make it easier to adapt
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// input attributes to be convertible to and from JSON
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// before sending or receiving it from the database.
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type jsonModifier struct{}
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// Scan Implements the Scanner interface in order to load
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// this field from the JSON stored in the database
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func (j jsonModifier) AttrScan(ctx context.Context, opInfo OpInfo, attrPtr interface{}, dbValue interface{}) error {
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if dbValue == nil {
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v := reflect.ValueOf(attrPtr)
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// Set the struct to its 0 value just like json.Unmarshal
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// does for nil attributes:
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v.Elem().Set(reflect.Zero(reflect.TypeOf(attrPtr).Elem()))
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return nil
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}
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// Required since sqlite3 returns strings not bytes
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if v, ok := dbValue.(string); ok {
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dbValue = []byte(v)
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}
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rawJSON, ok := dbValue.([]byte)
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if !ok {
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return fmt.Errorf("unexpected type received to Scan: %T", dbValue)
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}
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return json.Unmarshal(rawJSON, attrPtr)
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}
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// Value Implements the Valuer interface in order to save
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// this field as JSON on the database.
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func (j jsonModifier) AttrValue(ctx context.Context, opInfo OpInfo, inputValue interface{}) (outputValue interface{}, _ error) {
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b, err := json.Marshal(inputValue)
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if opInfo.DriverName == "sqlserver" {
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return string(b), err
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}
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return b, err
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}
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