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client_namespace.go
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/
client_namespace.go
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package tablecache
import (
"github.com/aliyun/aliyun-tablestore-go-sdk/tablestore"
)
//查询namespace相关的表是否创建
func (t *TableCache) isNamespaceExist() (bool, error) {
tables, err := t.client.ListTable()
if err != nil {
return false, err
}
for _, table := range tables.TableNames {
if table == t.namespace {
return true, nil
}
}
return false, nil
}
//创建namespace相关的表,主键为key string
func (t *TableCache) createNamespace() error {
tableMeta := new(tablestore.TableMeta)
tableMeta.TableName = t.namespace
tableMeta.AddPrimaryKeyColumn("key", tablestore.PrimaryKeyType_STRING)
tableOption := new(tablestore.TableOption)
tableOption.TimeToAlive = -1
tableOption.MaxVersion = 1
//预留吞吐量按小时收费,因此设为0,不预留
reservedThroughput := new(tablestore.ReservedThroughput)
reservedThroughput.Readcap = 0
reservedThroughput.Writecap = 0
createTableRequest := new(tablestore.CreateTableRequest)
createTableRequest.TableMeta = tableMeta
createTableRequest.TableOption = tableOption
createTableRequest.ReservedThroughput = reservedThroughput
_, err := t.client.CreateTable(createTableRequest)
if err != nil {
return err
}
return nil
}
//设置表数据的生命周期,不得低于86400秒(一天), -1表示永不过期
func (t *TableCache) SetTTL(ttl int) error {
updateTableReq := new(tablestore.UpdateTableRequest)
updateTableReq.TableName = t.namespace
updateTableReq.TableOption = new(tablestore.TableOption)
updateTableReq.TableOption.TimeToAlive = ttl
updateTableReq.TableOption.MaxVersion = 1
_, err := t.client.UpdateTable(updateTableReq)
if err != nil {
return err
}
return nil
}
//检查namespace相关的表是否创建,如果没有创建,则创建一个默认的
func (t *TableCache) EnsureNamespaceExist() error {
ok, err := t.isNamespaceExist()
if err != nil {
return err
}
if !ok {
err = t.createNamespace()
if err != nil {
return err
}
}
return nil
}