This function can be extremely helpful as the database/sql package is able to assist in securing SQL statements by cleansing the inputs prior to command execution. To insert multiple rows using the multirow VALUES syntax: INSERT INTO films (code, title, did, date_prod, kind) VALUES ('B6717', 'Tampopo', 110, '1985-02-10', 'Comedy'), ('HG120', 'The Dinner Game', 140, DEFAULT, 'Comedy'); This example inserts some rows into table films from a table tmp_films with the same column layout as films: Use CopyFrom to efficiently insert multiple rows at a time using the PostgreSQL copy protocol. This hack is sort of ugly, though, as it relies on the driver recognizing a special SQL statement (NEXT) in order to return subsequent results.. One can insert one or more rows specified by value expressions, or zero or more rows resulting from a query. Just like QueryRow(), this allows us to pass in arguments and avoid any sort of SQL injection. 8. First, create a basic table named personnel with the following commands: Now insert some records in the table with the following commands: There should now be a table with the following records: This section will cover how Golang interacts with PostgreSQL. When you are querying for SQL records, I find that you generally fall into one of three use cases: Up until recently, only the first two use cases were supported by Go’s database/sql package. Or implement CopyFromSource to avoid buffering the entire data set in memory. "Item" ("Id", name) VALUES ('1', 'name1'), ('2', 'name2'), ('3','name3') Try executing query in your browser for free All rights reserved. Sharing helps me continue to create both free and premium Go resources. Third, supply a comma-separated list of rows after the VALUES keyword. This section will cover how Golang interacts with PostgreSQL. In this article we are going to cover the second use case - querying for a multiple records. To achieve the last you would need to pass data back and forth between queries (or construct different SQL queries). The steps of inserting multiple rows into a table is as follows: Create a database connection. Previously in database basics: 1. There is a more efficient way of coding this operation with the database/sql package that provided the $N where the index of the parameters is passed as an extra argument to the db.Exec( ). Create a database in Postgres. You can insert multiple rows in the database at the same time: INSERT INTO person (name, age) VALUES ('john doe', 25), ('jane doe', 20); LastInsertId() (int64, error) // RowsAffected returns the number of rows affected by an // update, insert, or delete. 8 Turning PostgreSQL rows into arrays. We can insert multiple rows in the SQL database using insert statement, insert into select statement, and Union All statement. No more shoehorning writeable common table expressions. Speak with an Expert for Free, How to Insert Record in PostgreSQL Database using Go Database/SQL Package, ----+-------+-------------+------------+----------------------, "SELECT * FROM personnel WHERE p_email='%s';", // this function main will call the getUserSQL then passed in the phrase, // '; DROP TABLE personnel;' as its argument. This tutorial will explain how to insert record in PostgreSQL database using Go database/SQL package. You can actually test this with the code above by changing the LIMIT to 0. – Dave Jarvis Dec 17 '12 at 17:24. The downside to this approach is that you may sometimes find yourself writing a bit more code, like passing in pointers to every field in a User object to the Scan() method. The lack of an API in database/sql for retrieving multiple results can almost be hacked around at the driver level. Or implement CopyFromSource to avoid buffering the entire data set in memory. If you want to insert more rows than that, you should consider using multiple INSERT statements, BULK INSERT or a derived table. For instance, examine the following code: In the above code the getUserSql() function accepts a parameter as an argument for the embedded SQL query that selects all the records within the personnel table where the field p_email is equal to the string parameter. About the Playground. So far in this series, I have described how you can create arrays and retrieve information from them — both the actual data stored in the array, and information about the array, such as its length.But the coolest trick, or set of tricks, that I use in PostgreSQL is the ability to turn arrays into rows, and vice versa. First, specify the name of the table that you want to insert data after the INSERT INTO keywords. Writing Course Notes. We can also insert multiple rows into PostgreSQL table using a single query. We do this by calling rows.Next(), which returns true when the next row is successfully prepared, and false otherwise. (. Jon Calhoun is a full stack web developer who also teaches about Go, web development, algorithms, and anything programming related. Here a single quote (‘) will be escaped as a result. PostgreSQL client and ORM for Golang ️ Uptrace.dev - distributed traces, logs, and errors in one place. This will allow us to interact with gosql the same way we would interact with any other database. Inserting multiple values in the rows is a tedious task when a table comes with a lot of attributes. In golang world, gorm is a nice orm framework, but it still not support Batch insert operation. type Row struct { // contains filtered or unexported fields} What is Upsert “UPSERT” is a DBMS feature that allows a DML statement’s author to atomically either insert a row, or on the basis of the row already existing, UPDATE that existing row instead, while safely giving little to no further thought to concurrency. The method call will return an error if there is one, and nil otherwise. This section will explain how the database/sql cleanses the code to avoid SQL injection attacks. This article is part of the series, Using PostgreSQL with Go. Use CopyFrom to efficiently insert multiple rows at a time using the PostgreSQL copy protocol. The results should resemble the following: Here the output statement will not only look for all the records within the personnel table, but it is also providing instructions to DROP the entire personnel table. We finally have the upsert feature we've been waiting for. Pagination with offset and limit is quite common to engineers. You are interested in multiple result sets. ; Documentation; Reference; Examples; Example projects: treemux; gin; go-kit; aah framework; GraphQL Tutorial on YouTube. If the data is already in a [] []interface {} use CopyFromRows to wrap it in a CopyFromSource interface. Try Fully-Managed CockroachDB, Elasticsearch, MongoDB, PostgreSQL (Beta) or Redis. For starters, it won’t return an error when no records are found. SELECT * FROM personnel WHERE email=''; DROP TABLE personnel;''; Prerequisites to Insert Record in PostgreSQL Database Using Go Database/SQL Package, How to Insert Records in PostgreSQL using Golang Database/SQL, How to Avoid SQL Injection Attack using Golang Database/SQL, PostgreSQL SELECT First Record on an ObjectRocket Instance, PostgreSQL Insert for an ObjectRocket Instance, How to Use the Postgres COUNT on an ObjectRocket Instance, PostgreSQL UPSERT for an ObjectRocket Instance, How to use PostgreSQL UPDATE WHERE on an ObjectRocket Instance, How to Perform the PostgreSQL Coalesce in ObjectRocket Instance, How to Use the Postgres Similar To Operator on an ObjectRocket instance, How to Use the PostgreSQL in Docker in ObjectRocket Instance. In most cases you won’t actually need to manually close the rows object because this happens when the Next() method is called and there aren’t anymore result sets left, but in the case of an error you may need to manually call Close(). This is the email value in this case. As shown in the previous section, the INSERT command via a terminal is used to insert records. Most of what we are going to cover here is very similar, but rather than using the QueryRow() method we will be using the Query() method. It also assumes that you have a valid connection to your database in your code (see earlier postsin this series if you need help with this any of this). We do this by calling defer rows.Close(). PostgreSQL DELETE Query. One solution is to link the databases. To create a database, we can simply use the following command from the CLI: If you are unsure of how many this is, I suggest calling the rows.Columns method which will return a slice of column names that are being returned by your SQL statement. "SELECT id, first_name FROM users LIMIT $1", // get any error encountered during iteration, You want to retrieve a single record. Just be sure to call rows.Err() and check for any errors! This article fits in the PostgreSQL Concurrency series, where we installed a tweeter like application schema and had all the characters from Shakespeare’s A Midsummer Night’s Dream tweet their own lines in our database in PostgreSQL Concurrency: Data Modification Language. This article assumes you have a single table named users in your Postgres database along with a few records to query. In Go 1.8 support for multiple result sets was added, making this much simpler. You can use the following SQL code to create a table and insert a few records if you haven’t already. We will see in the next article in this series how multiple result sets can affect this, and it is also possible to get a false return value when there is an error preparing the next row. I suspect the code was designed this way to make writing for loops simpler, but the downside to this is that it is very easy to forget to check for errors, so don’t forget to call rows.Err() and check for errors!. JSONB provides a wide array of options to index your JSON data. This means all data will be lost if this code is executed. While this code will work, this approach is also vulnerable to SQL injection attacks. Subscribe to our emails and we’ll let you know what’s going on at ObjectRocket. Elasticsearch® is a trademark of Elasticsearch BV, registered in the US and in other countries. The Go Playground is a web service that runs on golang.org's servers. Eg you might want all of the comments created by a specific user. While the SQL statement can be created using the package fmt with the fmt.Sprintf() function, it is not designed to understand SQL statements and all it can do is combine the strings passed to it. Query() behaves very differently from this. If the program contains tests or examples and no main function, the service runs the tests. The … For example, you might want to look up a specific user. In DELETE query, you can also use clauses like WHERE, LIKE, IN, NOT IN, etc., to select the rows for which the DELETE operation will be performed. One of the major differences between QueryRow() and Query() is how errors are handled. Confirm Golang in installed, working and obtain the version by executing the following command: The output should resemble the following: Before proceeding, a working data set is required. (If you need some development work done, get in touch!). Remember that it is more efficient to code the INSERT command with the database/sql package by passing the index of the parameters as an extra argument to the db.Exec( ). Here is an example: While the above statement will work, this is not the best way to execute this function. Golang must also be properly installed. ©2018 Jonathan Calhoun. Feature Request: Batch Insert . In future posts in this series we will discuss how to combat some of this repetitiveness using third party libraries like sqlx, SQLBoiler, and GORM, but first we need to cover the final way to query records with the database/sql package - querying with multiple result sets (not yet published). In the last article we discussed how to use the QueryRow() method to query for a single row. The code imports three packages: the sql package, the pq package as a driver to communicate with the PostgreSQL server, and the fmt package for printed input and output on the command line. We’ll show you how you can create a simple query app that uses Node.JS to insert into a PostgreSQL table. The number of rows that you can insert at a time is 1,000 rows using this form of the INSERT statement. This tutorial explained how to insert record in PostgreSQL database using Go database/SQL package. Not every database or database // driver may support this. In this article, we’ll focus on the task of inserting data into a table. This means that users with knowledge of this technique can hack the database due to the lack of coding security. Generally speaking, a false return value from rows.Next() means that there are no more records, but this isn’t always the case. Call the executeBatch() method to submit a batch of the INSERT statements to the PostgreSQL database server for execution. The tutorial also explained how to avoid a SQL injection attack using the Golang database/SQL. Use the following code to connect and create a table using CREATE TABLE SQL statement, followed by INSERT INTO SQL statements to add rows into the table. He also consults for other companies who have development needs. For a better understanding, refer to the previous example: SELECT * FROM personnel WHERE email=''; DROP TABLE personnel;''; By using the database/sql package the result will resemble the following: Note that by doubling up the single quotes it escapes the single quotes in SQL. After that we enter the for loop where we iterate over each record returned by our SQL statement. It also assumes that you have a valid connection to your database in your code (see earlier posts in this series if you need help with this any of this). Now, in the CLI or the GUI we can start creating tables and insert data and all that there is. Let’s jump right into an example and then explain what is going on. You will also receive emails from me about upcoming courses (including FREE ones), new blog posts, and course discounts. With PostgreSQL, it’s simple to connect to a database and perform a number of different database operations using Node. This article assumes you have a single table named users in your Postgres database along with a few records to query. GitHub Gist: instantly share code, notes, and snippets. Inserting multiple rows into a table. Original post. One example of this might be if you wanted to create a temporary table of users with a certain attribute, and then query for many pieces of information about that user. The upside to this is that if you already know SQL you don’t need to learn too much to quickly become productive. As shown in the previous section, the INSERT command via a terminal is used to insert records. INSERT inserts new rows into a table. SELECT, INSERT, CREATE and a REPL 2. binary expressions and WHERE filters 3. indexes. Create a PreparedStatement object. PostgreSQL connection strings embedded in your application can take two different forms: the key-value notation or the postgresql:// URI scheme. Instead, the database/sql package is designed to help you write safe SQL queries and then get out of your way. Let others know about it! To insert multiple rows using the multirow VALUES syntax (for PostgreSQL 8.2 or newer) INSERT INTO public. The most common error you will likely encounter at this point is something like: This means that you are passing the incorrect number of arguments into the Scan() method. SQLBulkCopy of ADO.NET 2.0 [1] or has a specifier upto how many statements should be grouped together cf. postgresql documentation: Inserting multiple rows. To insert multiple rows and return the inserted rows, you add the RETURNING clause as follows: For example, examine the following statement: In the above statement, the $N is used as an index that accepts the values for the INSERT function with a basic error handler added. This problem can be avoided by using the database/sql package when creating SQL statements as it provides some protection against this type attack by reading all of the SQL special characters. No more defining custom merge functions. INSERT INTO students (id, name, age) All you have to do is, provide multiple rows after VALUES keywork in the INSERT query as shown below. You can reach me via email or via twitter. MongoDB® is a registered trademark of MongoDB, Inc. Redis® and the Redis® logo are trademarks of Salvatore Sanfilippo in the US and other countries. In this article I list how to do common SQL database operations with Go. Jon's latest progress update: Assuming there were no errors, our *Rows object shouldn’t be nil and we can go ahead and defer a call to close the rows. PostgreSQL DELETE Query is used to delete one or more rows of a table. However (and this is a big however), you have databases residing in separate places, not even of the same DBMS (MS SQL and Postgres), so you can't do the above quite so simply. This means that you could encounter an error before you even start to iterate over the results, so you need to check for one first. One of those two outcomes must be guaranteed, regardless of concurrent […] The Go database/SQL package is a light-weight interface and must be used to operate a SQL, or similar databases, in Golang. I will show you guy how to … The article specifically covered how to create a working data set and insert records in PostgreSQL using a Golang database/SQL. Have a Database Problem? Exception handler on multiple row insert PostgreSQL. The current implementation of database/sql doesn't provide a way to insert multiple rows at once, without getting to the wire upon every call to db.Exec There are APIs outside which either provide a general way for bulk actions cf. Did you find this page helpful? In Laravel, we can add the whole array as rows and insert … We hate spam and make it easy to unsubscribe. The next thing to notice is that calling Query() returns both a pointer to Rows, along with an error. Take a look at lib/pq#425 for an example of achieving this in the lib/pq postgres driver. Example. PostgreSQL also provides a variety of Creation Functions and Processing Functions to work with the JSONB data.. JSONB Indexes. It is also an idempotent method, meaning that you can call it multiple times without any negative side effects, so I suggest calling it via defer as long as Rows isn’t nil. PostgreSQL demo of Array types using Golang. This use case is a little rarer, but it generally pops up when you want to use some intermediary data between queries. You can use the following SQL code to create a table and insert a few records if you haven’t already. RowsAffected() (int64, error) } type Row ¶ Row is the result of calling QueryRow to select a single row. Jon is a co-founder of EasyPost, a shipping API that many fortune 500 companies use to power their shipping infrastructure, and prior to founding EasyPost he worked at google as a software engineer. The PostgreSQL server must be properly installed and running. Much like the rest of the articles discussing using Go’s database/sql package, this article didn’t really have that much Go code in it. INSERT INTO table_a SELECT ... FROM table_b; ...and this will run much faster the vast majority of the time. While in the rows.Next() loop you can use the rows variable pretty similar to how you would a single Row. In addition to the Scan() method, Rows also has a few other helper methods such as: Finally we can print out our data (or do whatever else you need with it) and move along with our program. If the user supplies the query with a '; DROP TABLE personnel;' value, it will result in the query being read as below: NOTE: For this example, create a Golang file to get a clear picture. … Call the addBatch() method of the PreparedStatement object. Sign up for my mailing list and I'll send you a FREE sample from my course - Web Development with Go. In this syntax, instead of using a single list of values, you use multiple comma-separated lists of values for insertion. Before continuing, you need to make sure you understand how to connect to your database using database/sql.You can find instructions for this in the previous post - Connecting to a PostgreSQL database with Go's database/sql package - and the code in this post will build off of this, but you can easily adapt the code here for whatever connection code you currently have. This post is part of the series, Using PostgreSQL with Go. The sample includes the first few chapters from the book, and over 2.5 hours of screencasts. Pagination with Offset and Limit. See something that is wrong, think this article could be improved, or just want to say thanks? When it comes to using psql though, another form of connection string is introduced, with command line options -h -p -U and environment variable support.. Second, list the required columns or all columns of the table in parentheses that follow the table name. In this short article you will learn that you can use either of the three different forms … All that happens is our for loop never actually runs. That is why you see the call to rows.Err() near the end of the sample - this is our way of verifying that there wasn’t an error when calling rows.Next(). This is what we are doing on the first line with the $1 part of the SQL statement, and then the 3 argument passed into the Query() method. CopyFrom accepts a CopyFromSource interface. The one exception is that you won’t ever receive the ErrNoRows error in this case, but you might receive an error complaining about Scan() being called before Next() was called. You want to retrieve many records from the same table (or through joins). Prerequisites to using PostgreSQL and Node.JS CopyFrom accepts a CopyFromSource interface. With the release of PostgreSQL 9.5, we now have a better way to upsert data. In this post, we’ll extend gosql to implement the database/sql driver interface. I'd love to hear what you have to say! You need to pass in enough arguments for all of the columns retrieved by your SQL statement. You call Scan() on each individual row and pass in destinations for the data. I use a single stored procedure to wrap the INSERT statement, but I can imagine scenarios where multiple INSERT statements and hence multiple checks are present in the code base. Join Discord to ask questions. This statement can also be used in the Golang code to insert records by simply hard coding the SQL statement and then using the db.Exec() from the sql.DB object to perform the INSERT operation. The service receives a Go program, vets, compiles, links, and runs the program inside a sandbox, then returns the output. With QueryRow(), error handling is deferred until you call Scan(), and an error is returned when 0 records are found. If the data is already in a [][]interface{} use CopyFromRows to wrap it in a CopyFromSource interface. No more making multiple trips to the database. Introducing database/sql Open the database connection Close the database connection Extract data from the database Select a single row Select multiple rows Introducing database/sql Go offers a clean SQL database API in its standard library database/sql package, but the specific database drivers must be … Batch Update of ADO.NET 2.0 DataAdapter Object … Typing \l in the prompt will show all the databases Postgres currently have. Article is part of the table in parentheses that follow the table that you can reach me via email via... ’ t need to pass in arguments and avoid any sort of SQL attacks. Insert, create and a REPL 2. binary expressions and WHERE filters indexes. Postgresql copy protocol knowledge of this technique can hack the database due to the lack of coding security the! Already in a [ ] [ ] interface { } use CopyFromRows to wrap it in a [ interface! That uses Node.JS to insert into keywords a full stack web developer who also teaches about Go, web,! But it generally pops up when you want to insert records in PostgreSQL using a Golang database/SQL escaped! Table named users in your Postgres database along with an error when records! Rows variable pretty similar to how you can use the QueryRow ( ) is how errors handled! ) loop you can use the rows variable pretty similar to how you would a row... Show you how you can create a table to execute this function similar databases, in Golang how would... The previous section, the database/SQL driver interface a CopyFromSource interface URI scheme embedded in your Postgres along. This with the code to avoid buffering the entire data set in memory discussed how to create database. Multiple result sets was added, making this much simpler ) and check for golang postgres insert multiple rows errors share,. Show all the databases Postgres currently have PostgreSQL DELETE query is used to a... And avoid any sort of SQL injection attack using the PostgreSQL database using statement. Service that runs on golang.org 's servers rows.Err ( ) on each individual row and pass in arguments avoid... A table server must be used to insert golang postgres insert multiple rows after the VALUES keyword interface { } use to... Task when a table ] PostgreSQL demo of array types using Golang the JSONB data.. JSONB indexes a interface! Includes the first few chapters from the book, and errors in one place a pointer to rows along. And errors in one place table comes with a few records if haven... Error ) } type row ¶ row is successfully prepared, and otherwise... Return an error when no records are found and perform a number of database. Form of the series, using PostgreSQL with Go query for a single row this is... You will also receive emails from me about upcoming courses ( including FREE ones ), blog! After the VALUES keyword a few records if you need some development work done, get in!! Be used to DELETE one or more rows specified by value expressions or. Comments created by a specific user calling QueryRow to select a single row in PostgreSQL using a single table users... See something that is wrong, think this article i list how to use some intermediary data between queries or... Is used to insert record in PostgreSQL database using Go database/SQL package is web. And nil otherwise we would interact with gosql the same way we would interact with gosql the same (! Lib/Pq # 425 for an example: while the above statement will work, this approach also... Development with Go single quote ( ‘ ) will be lost if this is! Free sample from my course - web development with Go the code to create a database perform! Of Creation Functions and Processing Functions to work with the JSONB data JSONB. In database/SQL for retrieving multiple results can almost be hacked around at driver. Is 1,000 rows using the multirow VALUES syntax ( for PostgreSQL 8.2 or newer ) insert into a table! Terminal is used to operate a SQL, or zero or more rows than that, should! Values keyword how you can insert multiple rows in the prompt will show all the databases Postgres have... For other companies who have development needs we discussed how to avoid buffering the data. Row is successfully prepared, and course discounts the result of calling QueryRow select! Section, the service runs the tests, using PostgreSQL with Go a variety of Functions. ] or has a specifier upto how many statements should be grouped together cf database/SQL cleanses code. Rows of a table and insert a few records to query won ’ t.! At lib/pq # 425 for an example: while the above statement work! True when the next row is the result of calling QueryRow to select a single table users... Users in your application can take two different forms: the key-value notation or the copy. In a [ ] [ ] interface { } use CopyFromRows to wrap in! A working data set in memory in memory rows.Close ( ) is how errors are handled Creation Functions and Functions. Operations with Go ) or Redis { } use CopyFromRows to wrap it in a CopyFromSource interface with. Loop WHERE we iterate over each record returned by our SQL statement package. Via twitter t return an error if there is one, and programming! Of array types using Golang insert data after the VALUES keyword we do by. First, specify the name of the series, using PostgreSQL with Go me via or... 2.0 [ 1 ] or has a specifier upto how many statements be... Explain how the database/SQL cleanses the code above by changing the Limit to.. Web service that runs on golang.org 's servers anything programming related to submit a batch of table. To query query app that uses Node.JS to insert more rows specified by value expressions or! Is not the best way to execute this function insert statement to look up a specific.! Can insert at a time using the PostgreSQL server must be properly installed and running name of the comments by... As shown in the rows variable pretty similar to how you would a single query the major differences QueryRow. Avoid buffering the entire data set in memory operations using Node single row in! Means all data will golang postgres insert multiple rows escaped as a result and snippets look a! Insert statements to the PostgreSQL copy protocol added, making this much simpler your application can two! Latest progress update: Writing course notes is used to DELETE one or more resulting... Our for loop WHERE we iterate over each record returned by our statement! Values syntax ( for PostgreSQL 8.2 or newer ) insert into public it ’... Postgresql also provides a wide array of options to index your JSON data create a table currently. Client and ORM for Golang ️ Uptrace.dev - distributed traces, logs, anything! To call rows.Err ( ) method to query the entire data set and insert a few records to query a. Or through joins ) select a single quote ( ‘ ) will be if... Time is 1,000 rows using the PostgreSQL server must be guaranteed, regardless of concurrent [ … PostgreSQL... With a few records to query the insert into select statement, and errors in one.... Tests or Examples and no main function, the insert query as shown in the rows.Next )!, the database/SQL driver interface be grouped together cf SQL statement t return an error when no records are.! Don ’ t return an error when no records are found implement database/SQL... Injection attack using the PostgreSQL server must be properly installed and running into select statement, insert into public same... Uses Node.JS to insert more rows than that, you might want to insert records in PostgreSQL database Go... Logs, and false otherwise full stack web developer who also teaches about Go, web development with Go returns. Or has a specifier upto how many statements should be grouped together cf statement, and Union statement... Is one, and anything programming related and i 'll send you a FREE sample from my course web... The result of calling QueryRow to select a single row to call rows.Err ( ) method of major! Table and insert a few records if you haven ’ t need to pass in arguments and avoid sort. Array of options to index your JSON data happens is our for loop WHERE we iterate each. Retrieving multiple results can almost be hacked around at the driver level have the upsert feature we 've been for. 'Ll send you a FREE sample from my course - web development with Go the rows.Next ( ) and (. Record returned by our SQL statement ’ s jump right into an example and then explain what is on! Sort of SQL injection attacks rows specified by value expressions, or zero or rows. [ ] [ ] [ ] [ ] interface { } use to... Your Postgres database along with a few records if you already know SQL don! Newer ) insert into keywords to … we can also insert multiple rows the. Record in PostgreSQL database using Go database/SQL package, create and a 2.... Achieving this in the lib/pq Postgres driver ( Beta ) or Redis Elasticsearch, MongoDB, PostgreSQL ( Beta or... Following SQL code to avoid a SQL injection attacks rarer, but it generally pops up when you want look! Test this with the JSONB data.. golang postgres insert multiple rows indexes discussed how to do common database. Are found and course discounts development, algorithms, and nil otherwise the key-value notation or the PostgreSQL protocol! Then get out of your way Reference ; Examples ; example projects: ;... Programming related, specify the name of the table that golang postgres insert multiple rows can create a data. All data will be lost if this code is executed insert one or more rows specified by value expressions or! Service that runs on golang.org 's servers the PostgreSQL server must be guaranteed regardless!