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# Schema-System
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BaraDB verwendet ein Schema-first Design mit Typvererbung und automatischen Migrationen.
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## Typen definieren
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```nim
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import barabadb/schema/schema
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var s = newSchema()
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let person = newType("Person")
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person.addProperty("name", "str", required = true)
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person.addProperty("age", "int32")
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s.addType("default", person)
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```
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## Typvererbung
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```nim
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let employee = newType("Employee")
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employee.setBases(@["Person"])
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employee.addProperty("department", "str")
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s.addType("default", employee)
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# Vererbung auflösen — Employee erhält name, age, department
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let resolved = s.resolveInheritance(employee)
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```
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## Schema-Operationen
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### Diff
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Zwei Schemata vergleichen:
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```nim
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let diff = s.diff(oldSchema, newSchema)
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```
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### Migrationen
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Schema-Änderungen werden verfolgt und können Migrationsskripte generieren.
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## Eigenschaftstypen
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| Typ | Beschreibung |
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|------|-------------|
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| `str` | String |
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| `int32` | 32-Bit Integer |
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| `int64` | 64-Bit Integer |
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| `float32` | 32-Bit Float |
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| `float64` | 64-Bit Float |
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| `bool` | Boolean |
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| `datetime` | Datums-/Zeitwert |
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| `bytes` | Binärdaten |
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