end
7e30272020
ExprPtrs dereferences []*T values, skips nil entries, and maps survivors through a converter. Co-authored-by: Cursor <cursoragent@cursor.com>
72 lines
2.4 KiB
Markdown
72 lines
2.4 KiB
Markdown
# dbx
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**D**ata**b**ase e**x**tensions — a small toolkit of reusable database helpers built on [Jet](https://github.com/go-jet/jet) and [go-toolkit/app](https://gitea.auvem.com/go-toolkit/app).
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## Install
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```bash
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go get gitea.auvem.com/go-toolkit/dbx
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```
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## Quick start
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```go
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import (
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"gitea.auvem.com/go-toolkit/app"
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"gitea.auvem.com/go-toolkit/dbx"
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_ "gitea.auvem.com/go-toolkit/dbx/dbxm" // MySQL debug logging only
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)
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func main() {
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cfg := &dbx.DBConfig{
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User: "user",
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Password: "pass",
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URI: "localhost:3306",
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Name: "mydb",
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MaxConn: 10,
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}
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modules := []*app.Module{
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dbx.ModuleDB(dbx.DialectMySQL, cfg, false),
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}
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app.Run(modules...)
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db := dbx.SQLO()
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_ = db
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}
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```
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For Postgres, use `dbx.DialectPostgres` and blank-import `dbxp` instead of `dbxm` when `DebugLog` is enabled.
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## Helper catalog
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| Area | Functions |
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|------|-----------|
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| Query | `Fetch`, `MustFetch`, `FetchOne`, `MustFetchOne`, `Query`, `MustQuery` (+ `*Context` variants) |
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| Mutations | `Insert`, `InsertReturning`, `Update`, `UpdateAffected`, `UpdateOne`, `UpdateReturning`, `Delete`, `DeleteAffected` (+ `*Context` variants) |
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| Transactions | `WithTx`, `WithTxValue` |
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| Columns | `NormalCols`, `ContainsCol`, `ExprValues`, `ExprPtrs`, `ExprStringers`, `StringKSUIDExpr`, `BinaryKSUIDExpr`, `QueryCount`, `BuildQueryCountFn` |
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| Partial update | `ApplyPtr`, `ApplyComplexPtr`, `ApplyInterfacePtr`, `ApplyVal` |
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| Pointers | `Ptr`, `Val`, `NowPtr`, `TrimPtr`, `TrimPtrToNil`, `IsZero` |
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| Types | `StringKSUID`, `BinaryKSUID`, `JSONB` |
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| GraphQL | `MarshalUint64`, `UnmarshalUint64` |
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## KSUID type selection
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| Type | SQL column | Storage |
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|------|------------|---------|
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| `StringKSUID` | `VARCHAR(27)`, `TEXT` | Base62 string |
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| `BinaryKSUID` | `BINARY(20)`, `BYTEA` | Raw 20 bytes |
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Both types use identical GraphQL string scalar transit. Pick the type that matches your column encoding — Scan rejects ambiguous payloads.
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## Dialect notes
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- **MySQL inserts:** use `Insert` for `LastInsertId` workflows.
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- **Postgres inserts:** use `InsertReturning` with a Jet `RETURNING` clause.
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- **Debug logging:** requires blank-import of `dbxm` or `dbxp` matching your dialect. Without it, module setup returns an error when `DebugLog` is true.
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## Documentation
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Package docs are available on pkg.go.dev and via `go doc gitea.auvem.com/go-toolkit/dbx`.
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