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main.go
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main.go
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// 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.
package main
import (
"database/sql"
"fmt"
"log"
"reflect"
_ "github.com/ClickHouse/clickhouse-go/v2"
)
func main() {
c, err := sql.Open("clickhouse", fmt.Sprintf("clickhouse://%s:%s@%s:%d/", "", "", "localhost", 9000))
if err != nil {
log.Printf("Can't create connection to db")
log.Fatal(err)
}
if err := c.Ping(); err != nil {
log.Printf("Can't connect to db")
log.Fatal(err)
}
log.Println("Reading system.query_log")
rows, err := c.Query("SELECT * FROM system.query_log")
if err != nil {
log.Printf("Query failed")
log.Fatal(err)
}
//iterate to exhaustion
columnTypes, err := rows.ColumnTypes()
if err != nil {
log.Printf("Can't get column types")
log.Fatal(err)
}
vars := make([]any, len(columnTypes), len(columnTypes))
for i := range columnTypes {
value := reflect.Zero(columnTypes[i].ScanType()).Interface()
vars[i] = &value
}
i := 0
for rows.Next() {
if err := rows.Scan(vars...); err != nil {
log.Fatal(err)
}
i++
}
log.Println(rows.Err())
log.Printf("Success with %d rows!!", i)
}