/
quickstart_dense_test.go
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/
quickstart_dense_test.go
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/**
* @file quickstart_dense_test.go
*
* @section LICENSE
*
* The MIT License
*
* @copyright Copyright (c) 2018 TileDB, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @section DESCRIPTION
*
* This is a part of the TileDB quickstart tutorial:
* https://docs.tiledb.io/en/latest/quickstart.html
*
* When run, this program will create a simple 2D dense array, write some data
* to it, and read a slice of the data back in the layout of the user's choice
* (passed as an argument to the program: "row", "col", or "global").
*
*/
package examples
import (
"fmt"
"os"
"github.com/TileDB-Inc/TileDB-Go"
)
// Name of array.
var denseArrayName = "quickstart_dense"
func createDenseArray() {
// Create a TileDB context.
ctx, err := tiledb.NewContext(nil)
checkError(err)
// The array will be 4x4 with dimensions "rows" and "cols", with domain [1,4].
domain, err := tiledb.NewDomain(ctx)
checkError(err)
rowDim, err := tiledb.NewDimension(ctx, "rows", []int32{1, 4}, int32(4))
checkError(err)
colDim, err := tiledb.NewDimension(ctx, "cols", []int32{1, 4}, int32(4))
checkError(err)
err = domain.AddDimensions(rowDim, colDim)
checkError(err)
// The array will be dense.
schema, err := tiledb.NewArraySchema(ctx, tiledb.TILEDB_DENSE)
err = schema.SetDomain(domain)
checkError(err)
err = schema.SetCellOrder(tiledb.TILEDB_ROW_MAJOR)
checkError(err)
err = schema.SetTileOrder(tiledb.TILEDB_ROW_MAJOR)
checkError(err)
// Add a single attribute "a" so each (i,j) cell can store an integer.
a, err := tiledb.NewAttribute(ctx, "a", tiledb.TILEDB_INT32)
checkError(err)
err = schema.AddAttributes(a)
checkError(err)
// Create the (empty) array on disk.
array, err := tiledb.NewArray(ctx, denseArrayName)
checkError(err)
err = array.Create(schema)
checkError(err)
}
func writeDenseArray() {
ctx, err := tiledb.NewContext(nil)
checkError(err)
// Prepare some data for the array
data := []int32{
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
// Open the array for writing and create the query.
array, err := tiledb.NewArray(ctx, denseArrayName)
checkError(err)
err = array.Open(tiledb.TILEDB_WRITE)
checkError(err)
query, err := tiledb.NewQuery(ctx, array)
checkError(err)
err = query.SetLayout(tiledb.TILEDB_ROW_MAJOR)
checkError(err)
_, err = query.SetBuffer("a", data)
checkError(err)
// Perform the write and close the array.
err = query.Submit()
checkError(err)
err = array.Close()
checkError(err)
}
func readDenseArray() {
ctx, err := tiledb.NewContext(nil)
checkError(err)
// Prepare the array for reading
array, err := tiledb.NewArray(ctx, denseArrayName)
checkError(err)
err = array.Open(tiledb.TILEDB_READ)
checkError(err)
// Slice only rows 1, 2 and cols 2, 3, 4
subArray := []int32{1, 2, 2, 4}
// Prepare the vector that will hold the result (of size 6 elements)
data := make([]int32, 6)
// Prepare the query
query, err := tiledb.NewQuery(ctx, array)
checkError(err)
err = query.SetSubArray(subArray)
checkError(err)
err = query.SetLayout(tiledb.TILEDB_ROW_MAJOR)
checkError(err)
_, err = query.SetBuffer("a", data)
checkError(err)
// Submit the query and close the array.
err = query.Submit()
checkError(err)
err = array.Close()
checkError(err)
// Print out the results.
fmt.Println(data)
}
// ExampleDenseArray shows and example creation, writing and reading of a dense
// array
func ExampleDenseArray() {
createDenseArray()
writeDenseArray()
readDenseArray()
// Cleanup example so unit tests are clean
if _, err := os.Stat(denseArrayName); err == nil {
err = os.RemoveAll(denseArrayName)
checkError(err)
}
// Output: [2 3 4 6 7 8]
}