feat: add mssql data extraction script

scripts/mssql-test/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+	"time"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	_ "github.com/microsoft/go-mssqldb"
+	log "github.com/sirupsen/logrus"
+)
+
+func main() {
+	log.SetFormatter(&log.TextFormatter{
+		FullTimestamp:   true,
+		TimestampFormat: time.StampMilli,
+	})
+	log.SetLevel(log.DebugLevel)
+
+	db, err := sql.Open("sqlserver", config.App.SourceDbUrl)
+	if err != nil {
+		log.Fatal("Unexpected error connecting to mssql", err)
+	}
+
+	ctx := context.Background()
+
+	schema := "test"
+	table := "migration_test"
+	colNames := []string{"id", "nombre_producto", "descripcion", "stock", "precio", "es_activo", "fecha_creacion", "ultima_actualizacion", "configuracion_json", "etiquetas", "binario_test", "ip_servidor", "rango_prueba_min", "rango_prueba_max"}
+
+	query := buildExtractSqlSentence(schema, table, colNames)
+
+	rows, err := db.QueryContext(ctx, query)
+	if err != nil {
+		log.Fatal("Unexpected error extracting data", err)
+	}
+	defer rows.Close()
+
+	cols, _ := rows.Columns()
+
+	values := make([]any, len(cols))
+	scanArgs := make([]any, len(cols))
+	for i := range values {
+		scanArgs[i] = &values[i]
+	}
+
+	count := 0
+	for rows.Next() {
+		if err := rows.Scan(scanArgs...); err != nil {
+			log.Fatal("Error scan", err)
+		}
+
+		count++
+		if count%100000 == 0 {
+			log.Infof("Procesadas %d filas...\n", count)
+		}
+
+		if count < 2 {
+			log.Debugf("Processed row (%d):", count)
+
+			for i, col := range cols {
+				log.Debugf("%s: %v", col, values[i])
+			}
+		}
+	}
+
+	log.Infof("Rows processed %d", count)
+}
+
+func buildExtractSqlSentence(schema, table string, colNames []string) string {
+	var sbColumns strings.Builder
+
+	for i, col := range colNames {
+		sbColumns.WriteString(`[`)
+		sbColumns.WriteString(col)
+		sbColumns.WriteString(`]`)
+		if i < len(colNames)-1 {
+			sbColumns.WriteString(", ")
+		}
+	}
+
+	return fmt.Sprintf(`SELECT %s FROM [%s].[%s] WITH (NOLOCK)`, sbColumns.String(), schema, table)
+}