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When attempting bulk insertions in a database, crafting SQL statements manually can introduce errors and performance bottlenecks. Leveraging pgx's pgx.Conn.CopyFrom feature provides an efficient solution that automates the process.
In the provided code, the SQL statement is constructed by concatenating strings, which can result in errors if the number of dollar parameters ($ signs) does not match the number of arguments passed to the conn.Exec function. Additionally, string concatenation for large inputs can be inefficient and lead to memory issues.
pgx's CopyFrom method simplifies bulk data insertion by leveraging the PostgreSQL copy protocol. It takes three arguments:
The CopyFromSource interface allows flexibility in specifying the data source. It can be implemented using a slice of slices of interface values (as in the example provided), a strings.Reader containing CSV data, or a custom implementation.
Below is a revised code snippet that demonstrates the use of CopyFrom:
<code class="go">rows := [][]interface{}{ {"abc", 10}, {"dns", 11}, {"qwe", 12}, {"dss", 13}, {"xcmk", 14}, } _, err := conn.CopyFrom( pgx.Identifier{"keys"}, []string{"keyval", "lastval"}, pgx.CopyFromRows(rows), )</code>
This code will efficiently bulk insert the rows into the "keys" table, significantly improving performance and reducing the possibility of errors compared to manual SQL crafting.
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