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sqler.go
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sqler.go
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package main
import (
"context"
"database/sql"
"sqler/pkg"
_ "github.com/go-sql-driver/mysql"
)
type Sqler struct {
ctx context.Context
cfg *pkg.Config
dbs []*sql.DB
tableMetas []*TableMeta
columnMeats []*ColumnMeta
jobExecutor *JobExecutor
}
type TableMeta struct {
Name string
Comment string
}
type ColumnMeta struct {
Name string
Comment string
Type string
}
func NewSqler(cfg *pkg.Config, printer *JobPrinter) *Sqler {
s := &Sqler{
ctx: context.Background(),
cfg: cfg,
dbs: make([]*sql.DB, len(cfg.DataSources)),
tableMetas: make([]*TableMeta, 0, 32),
columnMeats: make([]*ColumnMeta, 0, 128),
jobExecutor: NewJobExecutor(len(cfg.DataSources), printer),
}
// Init db and stmt job chan
jobExecutor := NewJobExecutor(len(s.dbs), printer)
jobExecutor.Start()
for dbID := 0; dbID < len(s.dbs); dbID++ {
connJob := NewConnJob(dbID, s)
jobExecutor.Submit(connJob, dbID)
}
jobExecutor.Shutdown(true)
// Start sql job
s.jobExecutor.Start()
return s
}
// ExecSerial executes sql in turn (each sql and database)
func (s *Sqler) ExecSerial(opts *SqlJobCtx, stmts ...string) {
jobSize := s.totalStmtSize(len(stmts))
jobId := 0
for _, stmt := range stmts {
for dbId := range s.dbs {
jobId++
job := NewSqlJob(stmt, jobId, jobSize, s.cfg.DataSources[dbId], s.dbs[dbId], opts)
s.jobExecutor.Submit(job, dbId)
s.jobExecutor.WaitForNoRemainJob()
}
}
}
// ExecPara executes sql in parallel (each database)
func (s *Sqler) ExecPara(opts *SqlJobCtx, stmts ...string) {
jobSize := s.totalStmtSize(len(stmts))
jobId := 0
for _, stmt := range stmts {
for dbId := range s.dbs {
jobId++
job := NewSqlJob(stmt, jobId, jobSize, s.cfg.DataSources[dbId], s.dbs[dbId], opts)
s.jobExecutor.Submit(job, dbId)
}
s.jobExecutor.WaitForNoRemainJob()
if opts.StopWhenError && s.jobExecutor.HasAnyError() {
return
}
}
}
func (s *Sqler) totalStmtSize(stmtSize int) int {
return len(s.dbs) * stmtSize
}
func (s *Sqler) loadSchema() error {
db0 := s.dbs[0]
schema := s.cfg.DataSources[0].Schema
tx, err := db0.Begin()
if err != nil {
return err
}
qtm, err := tx.Prepare(stmtQueryTableMetas)
if err != nil {
return err
}
rows, err := qtm.Query(schema)
if err != nil {
return err
}
for rows.Next() {
tm := &TableMeta{}
if err := rows.Scan(&tm.Name, &tm.Comment); err != nil {
return err
}
s.tableMetas = append(s.tableMetas, tm)
}
defer qtm.Close()
tx, err = db0.Begin()
if err != nil {
return err
}
qcm, err := tx.Prepare(stmtQueryColumnMetas)
if err != nil {
return err
}
rows, err = qcm.Query(schema)
if err != nil {
return err
}
for rows.Next() {
cm := &ColumnMeta{}
if err := rows.Scan(&cm.Name, &cm.Comment, &cm.Type); err != nil {
return err
}
s.columnMeats = append(s.columnMeats, cm)
}
defer qcm.Close()
return nil
}