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bulkinserter.go
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bulkinserter.go
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package sqlx
import (
"database/sql"
"fmt"
"strings"
"time"
"github.com/wuhc1010/go-zero/core/executors"
"github.com/wuhc1010/go-zero/core/logx"
"github.com/wuhc1010/go-zero/core/stringx"
)
const (
flushInterval = time.Second
maxBulkRows = 1000
valuesKeyword = "values"
)
var emptyBulkStmt bulkStmt
type (
// ResultHandler defines the method of result handlers.
ResultHandler func(sql.Result, error)
// A BulkInserter is used to batch insert records.
// Postgresql is not supported yet, because of the sql is formated with symbol `$`.
// Oracle is not supported yet, because of the sql is formated with symbol `:`.
BulkInserter struct {
executor *executors.PeriodicalExecutor
inserter *dbInserter
stmt bulkStmt
}
bulkStmt struct {
prefix string
valueFormat string
suffix string
}
)
// NewBulkInserter returns a BulkInserter.
func NewBulkInserter(sqlConn SqlConn, stmt string) (*BulkInserter, error) {
bkStmt, err := parseInsertStmt(stmt)
if err != nil {
return nil, err
}
inserter := &dbInserter{
sqlConn: sqlConn,
stmt: bkStmt,
}
return &BulkInserter{
executor: executors.NewPeriodicalExecutor(flushInterval, inserter),
inserter: inserter,
stmt: bkStmt,
}, nil
}
// Flush flushes all the pending records.
func (bi *BulkInserter) Flush() {
bi.executor.Flush()
}
// Insert inserts given args.
func (bi *BulkInserter) Insert(args ...any) error {
value, err := format(bi.stmt.valueFormat, args...)
if err != nil {
return err
}
bi.executor.Add(value)
return nil
}
// SetResultHandler sets the given handler.
func (bi *BulkInserter) SetResultHandler(handler ResultHandler) {
bi.executor.Sync(func() {
bi.inserter.resultHandler = handler
})
}
// UpdateOrDelete runs update or delete queries, which flushes pending records first.
func (bi *BulkInserter) UpdateOrDelete(fn func()) {
bi.executor.Flush()
fn()
}
// UpdateStmt updates the insert statement.
func (bi *BulkInserter) UpdateStmt(stmt string) error {
bkStmt, err := parseInsertStmt(stmt)
if err != nil {
return err
}
bi.executor.Flush()
bi.executor.Sync(func() {
bi.inserter.stmt = bkStmt
})
return nil
}
type dbInserter struct {
sqlConn SqlConn
stmt bulkStmt
values []string
resultHandler ResultHandler
}
func (in *dbInserter) AddTask(task any) bool {
in.values = append(in.values, task.(string))
return len(in.values) >= maxBulkRows
}
func (in *dbInserter) Execute(bulk any) {
values := bulk.([]string)
if len(values) == 0 {
return
}
stmtWithoutValues := in.stmt.prefix
valuesStr := strings.Join(values, ", ")
stmt := strings.Join([]string{stmtWithoutValues, valuesStr}, " ")
if len(in.stmt.suffix) > 0 {
stmt = strings.Join([]string{stmt, in.stmt.suffix}, " ")
}
result, err := in.sqlConn.Exec(stmt)
if in.resultHandler != nil {
in.resultHandler(result, err)
} else if err != nil {
logx.Errorf("sql: %s, error: %s", stmt, err)
}
}
func (in *dbInserter) RemoveAll() any {
values := in.values
in.values = nil
return values
}
func parseInsertStmt(stmt string) (bulkStmt, error) {
lower := strings.ToLower(stmt)
pos := strings.Index(lower, valuesKeyword)
if pos <= 0 {
return emptyBulkStmt, fmt.Errorf("bad sql: %q", stmt)
}
var columns int
right := strings.LastIndexByte(lower[:pos], ')')
if right > 0 {
left := strings.LastIndexByte(lower[:right], '(')
if left > 0 {
values := lower[left+1 : right]
values = stringx.Filter(values, func(r rune) bool {
return r == ' ' || r == '\t' || r == '\r' || r == '\n'
})
fields := strings.FieldsFunc(values, func(r rune) bool {
return r == ','
})
columns = len(fields)
}
}
var variables int
var valueFormat string
var suffix string
left := strings.IndexByte(lower[pos:], '(')
if left > 0 {
right = strings.IndexByte(lower[pos+left:], ')')
if right > 0 {
values := lower[pos+left : pos+left+right]
for _, x := range values {
if x == '?' {
variables++
}
}
valueFormat = stmt[pos+left : pos+left+right+1]
suffix = strings.TrimSpace(stmt[pos+left+right+1:])
}
}
if variables == 0 {
return emptyBulkStmt, fmt.Errorf("no variables: %q", stmt)
}
if columns > 0 && columns != variables {
return emptyBulkStmt, fmt.Errorf("columns and variables mismatch: %q", stmt)
}
return bulkStmt{
prefix: stmt[:pos+len(valuesKeyword)],
valueFormat: valueFormat,
suffix: suffix,
}, nil
}