89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"github.com/jackc/pgx/v5/pgxpool"
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_ "github.com/microsoft/go-mssqldb"
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log "github.com/sirupsen/logrus"
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)
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type UnknownRowValues = []any
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func extractFromMssql(ctx context.Context, job MigrationJob, columns []ColumnType, chunkSize int, db *sql.DB, out chan<- []UnknownRowValues) error {
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query := buildExtractQueryMssql(job, columns)
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log.Debug("Query used to extract data from mssql: ", query)
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rows, err := db.QueryContext(ctx, query)
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if err != nil {
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return err
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}
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defer rows.Close()
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rowsChunk := make([]UnknownRowValues, 0, chunkSize)
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for rows.Next() {
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values := make([]any, len(columns))
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scanArgs := make([]any, len(columns))
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for i := range values {
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scanArgs[i] = &values[i]
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}
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if err := rows.Scan(scanArgs...); err != nil {
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return err
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}
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rowsChunk = append(rowsChunk, values)
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if len(rowsChunk) >= chunkSize {
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out <- rowsChunk
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rowsChunk = make([]UnknownRowValues, 0, chunkSize)
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log.Debugf("Chunk send... %+v", job)
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}
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}
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if len(rowsChunk) > 0 {
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out <- rowsChunk
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log.Debugf("Chunk send... %+v", job)
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}
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return nil
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}
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func extractFromPostgres(ctx context.Context, job MigrationJob, columns []ColumnType, chunkSize int, db *pgxpool.Pool, out chan<- []UnknownRowValues) error {
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query := buildExtractQueryPostgres(job, columns)
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log.Debug("Query used to extract data from postgres: ", query)
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rows, err := db.Query(ctx, query)
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if err != nil {
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return err
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}
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defer rows.Close()
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rowsChunk := make([]UnknownRowValues, 0, chunkSize)
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for rows.Next() {
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values, err := rows.Values()
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if err != nil {
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return err
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}
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rowsChunk = append(rowsChunk, values)
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if len(rowsChunk) >= chunkSize {
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out <- rowsChunk
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rowsChunk = make([]UnknownRowValues, 0, chunkSize)
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log.Infof("Chunk send... %+v", job)
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}
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}
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if len(rowsChunk) > 0 {
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out <- rowsChunk
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log.Infof("Chunk send... %+v", job)
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}
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return nil
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}
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