本文整理汇总了Golang中github.com/cockroachdb/cockroach/internal/client.Txn.Get方法的典型用法代码示例。如果您正苦于以下问题：Golang Txn.Get方法的具体用法？Golang Txn.Get怎么用？Golang Txn.Get使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/cockroachdb/cockroach/internal/client.Txn的用法示例。
在下文中一共展示了Txn.Get方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: readCmd
// readCmd reads a value from the db and stores it in the env.
func readCmd(c *cmd, txn *client.Txn, t *testing.T) error {
r, err := txn.Get(c.getKey())
if err != nil {
return err
}
var value int64
if r.Value != nil {
value = r.ValueInt()
}
c.env[c.key] = value
c.debug = fmt.Sprintf("[%d]", value)
return nil
}示例2: resolveName
// resolveName resolves a table name to a descriptor ID by looking in the
// database. If the mapping is not found, sqlbase.ErrDescriptorNotFound is returned.
func (m *LeaseManager) resolveName(
txn *client.Txn, dbID sqlbase.ID, tableName string,
) (sqlbase.ID, error) {
nameKey := tableKey{dbID, tableName}
key := nameKey.Key()
gr, err := txn.Get(key)
if err != nil {
return 0, err
}
if !gr.Exists() {
return 0, sqlbase.ErrDescriptorNotFound
}
return sqlbase.ID(gr.ValueInt()), nil
}示例3: restoreTable
func restoreTable(
ctx context.Context,
sst engine.RocksDBSstFileReader,
txn *client.Txn,
table *sqlbase.TableDescriptor,
overwrite bool,
) error {
log.Infof(ctx, "Restoring Table %q", table.Name)
tableStartKey := roachpb.Key(sqlbase.MakeIndexKeyPrefix(table, table.PrimaryIndex.ID))
tableEndKey := tableStartKey.PrefixEnd()
existingDesc, err := txn.Get(sqlbase.MakeDescMetadataKey(table.GetID()))
if err != nil {
return err
}
existingData, err := txn.Scan(tableStartKey, tableEndKey, 1)
if err != nil {
return err
}
if existingDesc.Value != nil || len(existingData) > 0 {
if overwrite {
// We're about to Put the descriptor, so don't bother deleting it.
if err := txn.DelRange(tableStartKey, tableEndKey); err != nil {
return err
}
} else {
return errors.Errorf("table %q already exists", table.Name)
}
}
tableDescKey := sqlbase.MakeDescMetadataKey(table.GetID())
if err := txn.Put(tableDescKey, sqlbase.WrapDescriptor(table)); err != nil {
return err
}
return Import(ctx, sst, txn, engine.MVCCKey{Key: tableStartKey}, engine.MVCCKey{Key: tableEndKey})
}