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Implement release connection in batch (#1062)
* Implement release connetion * Add example * Improve API and fix code review issues * Add prepare batch section to README.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| // Licensed to ClickHouse, Inc. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. ClickHouse, Inc. licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
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| package clickhouse_api | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "github.com/ClickHouse/clickhouse-go/v2/lib/driver" | ||
| ) | ||
|
|
||
| func BatchWithReleaseConnection() error { | ||
| conn, err := GetNativeConnection(nil, nil, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| ctx := context.Background() | ||
| defer func() { | ||
| conn.Exec(ctx, "DROP TABLE example") | ||
| }() | ||
| if err := conn.Exec(ctx, `DROP TABLE IF EXISTS example`); err != nil { | ||
| return err | ||
| } | ||
| err = conn.Exec(ctx, ` | ||
| CREATE TABLE IF NOT EXISTS example ( | ||
| Col1 UInt64, | ||
| Col2 String | ||
| ) engine=Memory | ||
| `) | ||
|
|
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| batch, err := New(ctx, conn, "INSERT INTO example") | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| if err = batch.Append(1, "test-1"); err != nil { | ||
| return err | ||
| } | ||
|
|
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| if err = batch.Send(); err != nil { | ||
| return err | ||
| } | ||
|
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| if err = batch.Append(2, "test-2"); err != nil { | ||
| return err | ||
| } | ||
|
|
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| if err = batch.Send(); err != nil { | ||
| return err | ||
| } | ||
|
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| var count uint64 | ||
| if err = conn.QueryRow(context.Background(), `SELECT COUNT(*) FROM example`).Scan(&count); err != nil { | ||
| return err | ||
| } | ||
|
|
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| if count != uint64(2) { | ||
| return errors.New("count must be 2") | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| type YourBatch struct { | ||
| ctx context.Context | ||
|
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| insertStatement string | ||
|
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| conn driver.Conn | ||
| batch driver.Batch | ||
| } | ||
|
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| func New(ctx context.Context, conn driver.Conn, insertStatement string) (*YourBatch, error) { | ||
| batch, err := conn.PrepareBatch(ctx, insertStatement, driver.WithReleaseConnection()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &YourBatch{ | ||
| ctx: ctx, | ||
| insertStatement: insertStatement, | ||
| conn: conn, | ||
| batch: batch, | ||
| }, nil | ||
| } | ||
|
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| func (b *YourBatch) Append(col1 uint64, col2 string) error { | ||
| return b.batch.Append( | ||
| col1, | ||
| col2, | ||
| ) | ||
| } | ||
|
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| func (b *YourBatch) Send() error { | ||
| if err := b.batch.Send(); err != nil { | ||
| return err | ||
| } | ||
|
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| return b.reset() | ||
| } | ||
|
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| func (b *YourBatch) reset() error { | ||
| batch, err := b.conn.PrepareBatch(b.ctx, b.insertStatement, driver.WithReleaseConnection()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| b.batch = batch | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package driver | ||
|
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| type PrepareBatchOptions struct { | ||
| ReleaseConnection bool | ||
| } | ||
|
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| type PrepareBatchOption func(options *PrepareBatchOptions) | ||
|
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| func WithReleaseConnection() PrepareBatchOption { | ||
| return func(options *PrepareBatchOptions) { | ||
| options.ReleaseConnection = true | ||
| } | ||
| } |
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