# Getting Started

    library(dbProject)

# Introduction

The `dbProject` package provides connection management for local DuckDB databases. It uses `pins` for persistent storage and enables automatic reconnection.

## Creating a dbProject

    # Create project in temp directory
    project_dir <- tempfile("dbproject_demo")
    db_path <- file.path(project_dir, "demo.duckdb")

    proj <- dbProject$new(path = project_dir, dbdir = db_path)
    #> Creating new version '20260602T145216Z-98e42'
    #> Writing to pin 'cachedConnection'
    #> Manifest file written to root folder of board, as `_pins.yaml`
    proj
    #> ─────────────────────────────────── dbProject ──────────────────────────────────
    #> ✔ Connected
    #> ── Board Content ───────────────────────────────────────────────────────────────
    #> Board Path: '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea'
    #> # A tibble: 1 × 6
    #>   name             type  title          created             file_size meta
    #>   <chr>            <chr> <chr>          <dttm>              <fs::byt> <list>
    #> 1 cachedConnection rds   connConnectio… 2026-06-02 10:52:16       257 <pins_met>
    #> ── Database Content ────────────────────────────────────────────────────────────
    #> Database Path:
    #> '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea/demo.duckdb'

## Working with Data

    # Get the connection and add data
    con <- proj$get_conn()
    mtcars_tbl <- dplyr::copy_to(con, mtcars, "mtcars", temporary = FALSE, overwrite = TRUE)
    mtcars_tbl
    #> # Source:   table<mtcars> [?? x 11]
    #> # Database: DuckDB 1.5.2 [unknown@Linux 4.18.0-553.126.1.el8_10.x86_64:R 4.5.2//scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea/demo.duckdb]
    #>      mpg   cyl  disp    hp  drat    wt  qsec    vs    am  gear  carb
    #>    <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
    #>  1  21       6  160    110  3.9   2.62  16.5     0     1     4     4
    #>  2  21       6  160    110  3.9   2.88  17.0     0     1     4     4
    #>  3  22.8     4  108     93  3.85  2.32  18.6     1     1     4     1
    #>  4  21.4     6  258    110  3.08  3.22  19.4     1     0     3     1
    #>  5  18.7     8  360    175  3.15  3.44  17.0     0     0     3     2
    #>  6  18.1     6  225    105  2.76  3.46  20.2     1     0     3     1
    #>  7  14.3     8  360    245  3.21  3.57  15.8     0     0     3     4
    #>  8  24.4     4  147.    62  3.69  3.19  20       1     0     4     2
    #>  9  22.8     4  141.    95  3.92  3.15  22.9     1     0     4     2
    #> 10  19.2     6  168.   123  3.92  3.44  18.3     1     0     4     4
    #> # ℹ more rows

## Pinning Tables

    proj$pin_write(x = mtcars_tbl, name = "mtcars")
    #> Creating new version '20260602T145218Z-f87e6'
    #> Writing to pin 'mtcars'
    #> Manifest file written to root folder of board, as `_pins.yaml`
    proj
    #> ─────────────────────────────────── dbProject ──────────────────────────────────
    #> ✔ Connected
    #> ── Board Content ───────────────────────────────────────────────────────────────
    #> Board Path: '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea'
    #> # A tibble: 2 × 6
    #>   name             type  title          created             file_size meta
    #>   <chr>            <chr> <chr>          <dttm>              <fs::byt> <list>
    #> 1 cachedConnection rds   connConnectio… 2026-06-02 10:52:16       257 <pins_met>
    #> 2 mtcars           rds   mtcars: a pin… 2026-06-02 10:52:18       285 <pins_met>
    #> ── Database Content ────────────────────────────────────────────────────────────
    #> Database Path:
    #> '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea/demo.duckdb'
    #> ℹ Tables:
    #> • mtcars

## Disconnecting and Reconnecting

    # Disconnect
    proj$disconnect()
    proj
    #> ─────────────────────────────────── dbProject ──────────────────────────────────
    #> ✖ Disconnected
    #> ── Board Content ───────────────────────────────────────────────────────────────
    #> Board Path: '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea'
    #> # A tibble: 2 × 6
    #>   name             type  title          created             file_size meta
    #>   <chr>            <chr> <chr>          <dttm>              <fs::byt> <list>
    #> 1 cachedConnection rds   connConnectio… 2026-06-02 10:52:16       257 <pins_met>
    #> 2 mtcars           rds   mtcars: a pin… 2026-06-02 10:52:18       285 <pins_met>
    #> ── Database Content ────────────────────────────────────────────────────────────
    #> ℹ No active connection.

    # Reconnect
    proj$reconnect()
    proj
    #> ─────────────────────────────────── dbProject ──────────────────────────────────
    #> ✔ Connected
    #> ── Board Content ───────────────────────────────────────────────────────────────
    #> Board Path: '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea'
    #> # A tibble: 2 × 6
    #>   name             type  title          created             file_size meta
    #>   <chr>            <chr> <chr>          <dttm>              <fs::byt> <list>
    #> 1 cachedConnection rds   connConnectio… 2026-06-02 10:52:16       257 <pins_met>
    #> 2 mtcars           rds   mtcars: a pin… 2026-06-02 10:52:18       285 <pins_met>
    #> ── Database Content ────────────────────────────────────────────────────────────
    #> Database Path:
    #> '/scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea/demo.duckdb'
    #> ℹ Tables:
    #> • mtcars

## Reading Pinned Tables

    restored <- proj$pin_read("mtcars")
    head(restored, 5)
    #> # Source:   SQL [?? x 11]
    #> # Database: DuckDB 1.5.2 [unknown@Linux 4.18.0-553.126.1.el8_10.x86_64:R 4.5.2//scratch/5919152.1.linga/RtmpMwIBEx/dbproject_demo2a85547df2ea/demo.duckdb]
    #>     mpg   cyl  disp    hp  drat    wt  qsec    vs    am  gear  carb
    #>   <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
    #> 1  21       6   160   110  3.9   2.62  16.5     0     1     4     4
    #> 2  21       6   160   110  3.9   2.88  17.0     0     1     4     4
    #> 3  22.8     4   108    93  3.85  2.32  18.6     1     1     4     1
    #> 4  21.4     6   258   110  3.08  3.22  19.4     1     0     3     1
    #> 5  18.7     8   360   175  3.15  3.44  17.0     0     0     3     2

## Cleanup

    proj$disconnect()
    unlink(project_dir, recursive = TRUE)