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count_job.go
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/
count_job.go
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package main
import (
"database/sql"
"encoding/csv"
"errors"
"github.com/olekukonko/tablewriter"
"os"
"sqler/pkg"
"sync"
)
var _ ExecutableJob = (*CountJob)(nil)
func NewCountJob(sqler *Sqler, schemas []string) Job {
return WrapJob(&CountJob{
sqler: sqler,
schemas: schemas,
})
}
type CountJob struct {
sqler *Sqler
schemas []string
*DefaultJob
}
func (c *CountJob) DoExec() error {
// schema - ds - count
mapMu := new(sync.Mutex)
schemaDsCountMap := make(map[string]map[string]string)
for _, schema := range c.schemas {
schemaDsCountMap[schema] = make(map[string]string)
}
errsMu := new(sync.Mutex)
errs := make([]error, 0)
wg := new(sync.WaitGroup)
wg.Add(len(c.sqler.dbs))
for dbID, db := range sqler.dbs {
go func(dbID int, db *sql.DB, ds *pkg.DataSourceConfig) {
for _, schema := range c.schemas {
cntQuery := "select count(*) from " + schema
results, err := db.Query(cntQuery)
if err != nil {
errsMu.Lock()
errs = append(errs, err)
errsMu.Unlock()
continue
}
_, rows, err := convertSqlResults(results)
if err != nil {
errsMu.Lock()
errs = append(errs, err)
errsMu.Unlock()
continue
}
mapMu.Lock()
schemaDsCountMap[schema][ds.DsKey()] = rows[0][0]
mapMu.Unlock()
}
wg.Done()
}(dbID, db, sqler.cfg.DataSources[dbID])
}
wg.Wait()
if len(errs) > 0 {
return errors.Join(errs...)
}
// Write output
table := tablewriter.NewWriter(c.output)
// Csv
file, err := os.OpenFile("count.csv", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
panic(err)
}
defer file.Close()
csvWriter := csv.NewWriter(file)
header := make([]string, 0, len(c.schemas)+1)
header = append(header, "DataSource")
for _, schema := range c.schemas {
header = append(header, schema)
}
// Table header
table.SetHeader(header)
// Csv header
if err := csvWriter.Write(header); err != nil {
return err
}
for _, ds := range sqler.cfg.DataSources {
tableRow := make([]string, 0, len(c.schemas)+1)
tableRow = append(tableRow, ds.DsKey())
for _, schema := range c.schemas {
tableRow = append(tableRow, schemaDsCountMap[schema][ds.DsKey()])
}
// Table content
table.Append(tableRow)
// Csv content
if err := csvWriter.Write(tableRow); err != nil {
return err
}
}
table.Render()
csvWriter.Flush()
return nil
}
func (c *CountJob) SetWrapper(defaultJob *DefaultJob) {
c.DefaultJob = defaultJob
}