Or implement CopyFromSource to avoid buffering the entire data set in memory. One can insert one or more rows specified by value expressions, or zero or more rows resulting from a query. If the data is already in a [] []interface {} use CopyFromRows to wrap it in a CopyFromSource interface. Writing Course Notes. I will show you guy how to … Pagination with offset and limit is quite common to engineers. The method call will return an error if there is one, and nil otherwise. You can use the following SQL code to create a table and insert a few records if you haven’t already. All rights reserved. The steps of inserting multiple rows into a table is as follows: Create a database connection. "Item" ("Id", name) VALUES ('1', 'name1'), ('2', 'name2'), ('3','name3') Try executing query in your browser for free Try Fully-Managed CockroachDB, Elasticsearch, MongoDB, PostgreSQL (Beta) or Redis. Exception handler on multiple row insert PostgreSQL. Instead, the database/sql package is designed to help you write safe SQL queries and then get out of your way. Feature Request: Batch Insert . For starters, it won’t return an error when no records are found. After that we enter the for loop where we iterate over each record returned by our SQL statement. 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. We finally have the upsert feature we've been waiting for. If the data is already in a [][]interface{} use CopyFromRows to wrap it in a CopyFromSource interface. 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. (If you need some development work done, get in touch!). Did you find this page helpful? This article is part of the series, Using PostgreSQL with Go. In this syntax, instead of using a single list of values, you use multiple comma-separated lists of values for insertion. 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. The lack of an API in database/sql for retrieving multiple results can almost be hacked around at the driver level. First, specify the name of the table that you want to insert data after the INSERT INTO keywords. Join Discord to ask questions. In the last article we discussed how to use the QueryRow() method to query for a single row. 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. This use case is a little rarer, but it generally pops up when you want to use some intermediary data between queries. This tutorial explained how to insert record in PostgreSQL database using Go database/SQL package. See something that is wrong, think this article could be improved, or just want to say thanks? The Go Playground is a web service that runs on golang.org's servers. In this article I list how to do common SQL database operations with Go. 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.. Third, supply a comma-separated list of rows after the VALUES keyword. PostgreSQL DELETE Query. The number of rows that you can insert at a time is 1,000 rows using this form of the INSERT statement. CopyFrom accepts a CopyFromSource interface. You call Scan() on each individual row and pass in destinations for the data. In this short article you will learn that you can use either of the three different forms … 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. This will allow us to interact with gosql the same way we would interact with any other database. 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. 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(). No more making multiple trips to the database. We can insert multiple rows in the SQL database using insert statement, insert into select statement, and Union All statement. GitHub Gist: instantly share code, notes, and snippets. You are interested in multiple result sets. Not every database or database // driver may support this. 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 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. He also consults for other companies who have development needs. Prerequisites to using PostgreSQL and Node.JS Inserting multiple values in the rows is a tedious task when a table comes with a lot of attributes. In this article we are going to cover the second use case - querying for a multiple records. Let others know about it! Jon's latest progress update: This article assumes you have a single table named users in your Postgres database along with a few records to query. … PostgreSQL also provides a variety of Creation Functions and Processing Functions to work with the JSONB data.. JSONB Indexes. Just like QueryRow(), this allows us to pass in arguments and avoid any sort of SQL injection. 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. We hate spam and make it easy to unsubscribe. 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. The service receives a Go program, vets, compiles, links, and runs the program inside a sandbox, then returns the output. Eg you might want all of the comments created by a specific user. Sign up for my mailing list and I'll send you a FREE sample from my course - Web Development with Go. All that happens is our for loop never actually runs. As shown in the previous section, the INSERT command via a terminal is used to insert records. 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. The … While this code will work, this approach is also vulnerable to SQL injection attacks. 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. Original post. Pagination with Offset and Limit. 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. Golang must also be properly installed. You need to pass in enough arguments for all of the columns retrieved by your SQL statement. About the Playground. JSONB provides a wide array of options to index your JSON data. type Row struct { // contains filtered or unexported fields} To create a database, we can simply use the following command from the CLI: No more shoehorning writeable common table expressions. ©2018 Jonathan Calhoun. Here is an example: While the above statement will work, this is not the best way to execute this function. Subscribe to our emails and we’ll let you know what’s going on at ObjectRocket. 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). Or implement CopyFromSource to avoid buffering the entire data set in memory. You can actually test this with the code above by changing the LIMIT to 0. 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!. We can also insert multiple rows into PostgreSQL table using a single query. We’ll show you how you can create a simple query app that uses Node.JS to insert into a PostgreSQL table. Sharing helps me continue to create both free and premium Go resources. 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). 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. The Go database/SQL package is a light-weight interface and must be used to operate a SQL, or similar databases, in Golang. Here a single quote (‘) will be escaped as a result. 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. 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. 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. Call the executeBatch() method to submit a batch of the INSERT statements to the PostgreSQL database server for execution. Create a PreparedStatement object. 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. 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. For example, you might want to look up a specific user. You can insert multiple rows in the database at the same time: INSERT INTO person (name, age) VALUES ('john doe', 25), ('jane doe', 20); To insert multiple rows and return the inserted rows, you add the RETURNING clause as follows: This section will explain how the database/sql cleanses the code to avoid SQL injection attacks. This means that users with knowledge of this technique can hack the database due to the lack of coding security. In Laravel, we can add the whole array as rows and insert … Inserting multiple rows into a table. You can use the following SQL code to create a table and insert a few records if you haven’t already. This tutorial will explain how to insert record in PostgreSQL database using Go database/SQL package. CopyFrom accepts a CopyFromSource interface. All you have to do is, provide multiple rows after VALUES keywork in the INSERT query as shown below. Now, in the CLI or the GUI we can start creating tables and insert data and all that there is. – Dave Jarvis Dec 17 '12 at 17:24. No more defining custom merge functions. With PostgreSQL, it’s simple to connect to a database and perform a number of different database operations using Node. Batch Update of ADO.NET 2.0 DataAdapter Object … This article assumes you have a single table named users in your Postgres database along with a few records to query. Create a database in Postgres. INSERT INTO students (id, name, age) Call the addBatch() method of the PreparedStatement object. SELECT, INSERT, CREATE and a REPL 2. binary expressions and WHERE filters 3. indexes. ; Documentation; Reference; Examples; Example projects: treemux; gin; go-kit; aah framework; GraphQL Tutorial on YouTube. 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. You can reach me via email or via twitter. 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. 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. 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. This is the email value in this case. The PostgreSQL server must be properly installed and running. 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. 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. In golang world, gorm is a nice orm framework, but it still not support Batch insert operation. 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 … Take a look at lib/pq#425 for an example of achieving this in the lib/pq postgres driver. Have a Database Problem? This means all data will be lost if this code is executed. "SELECT id, first_name FROM users LIMIT $1", // get any error encountered during iteration, You want to retrieve a single record. INSERT inserts new rows into a table. We do this by calling rows.Next(), which returns true when the next row is successfully prepared, and false otherwise. 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. Use CopyFrom to efficiently insert multiple rows at a time using the PostgreSQL copy protocol. PostgreSQL client and ORM for Golang ️ Uptrace.dev - distributed traces, logs, and errors in one place. MongoDB® is a registered trademark of MongoDB, Inc. Redis® and the Redis® logo are trademarks of Salvatore Sanfilippo in the US and other countries. 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( ). 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. INSERT INTO table_a SELECT ... FROM table_b; ...and this will run much faster the vast majority of the time. 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). postgresql documentation: Inserting multiple rows. 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. 8 Turning PostgreSQL rows into arrays. The next thing to notice is that calling Query() returns both a pointer to Rows, along with an error. The article specifically covered how to create a working data set and insert records in PostgreSQL using a Golang database/SQL. This section will cover how Golang interacts with PostgreSQL. One of the major differences between QueryRow() and Query() is how errors are handled. 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. With QueryRow(), error handling is deferred until you call Scan(), and an error is returned when 0 records are found. Jon Calhoun is a full stack web developer who also teaches about Go, web development, algorithms, and anything programming related. SQLBulkCopy of ADO.NET 2.0 [1] or has a specifier upto how many statements should be grouped together cf. You will also receive emails from me about upcoming courses (including FREE ones), new blog posts, and course discounts. With the release of PostgreSQL 9.5, we now have a better way to upsert data. 8. The sample includes the first few chapters from the book, and over 2.5 hours of screencasts. To insert multiple rows using the multirow VALUES syntax (for PostgreSQL 8.2 or newer) INSERT INTO public. The upside to this is that if you already know SQL you don’t need to learn too much to quickly become productive. Use CopyFrom to efficiently insert multiple rows at a time using the PostgreSQL copy protocol. The tutorial also explained how to avoid a SQL injection attack using the Golang database/SQL. Generally speaking, a false return value from rows.Next() means that there are no more records, but this isn’t always the case. You want to retrieve many records from the same table (or through joins). In this post, we’ll extend gosql to implement the database/sql driver interface. Example. We do this by calling defer rows.Close(). 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. LastInsertId() (int64, error) // RowsAffected returns the number of rows affected by an // update, insert, or delete. RowsAffected() (int64, error) } type Row ¶ Row is the result of calling QueryRow to select a single row. In this article, we’ll focus on the task of inserting data into a table. PostgreSQL DELETE Query is used to delete one or more rows of a table. One solution is to link the databases. 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: One of those two outcomes must be guaranteed, regardless of concurrent […] As shown in the previous section, the INSERT command via a terminal is used to insert records. Second, list the required columns or all columns of the table in parentheses that follow the table name. (. Just be sure to call rows.Err() and check for any errors! 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 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 achieve the last you would need to pass data back and forth between queries (or construct different SQL queries). Previously in database basics: 1. I'd love to hear what you have to say! 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. Elasticsearch® is a trademark of Elasticsearch BV, registered in the US and in other countries. While in the rows.Next() loop you can use the rows variable pretty similar to how you would 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. 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.. This post is part of the series, Using PostgreSQL with Go. 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. Typing \l in the prompt will show all the databases Postgres currently have. Query() behaves very differently from this. Let’s jump right into an example and then explain what is going on. 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. PostgreSQL connection strings embedded in your application can take two different forms: the key-value notation or the postgresql:// URI scheme. If the program contains tests or examples and no main function, the service runs the tests. If you want to insert more rows than that, you should consider using multiple INSERT statements, BULK INSERT or a derived table. 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. 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( ). In Go 1.8 support for multiple result sets was added, making this much simpler. PostgreSQL demo of Array types using Golang. 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. 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. Rows using the PostgreSQL copy protocol courses ( including FREE ones ), new blog posts, and in... We hate spam and make it easy to unsubscribe SQL injection this section will explain how the package... Fully-Managed CockroachDB, Elasticsearch, MongoDB, PostgreSQL ( Beta ) or.... What is going on grouped together cf or Examples and no main,! Rows of a table comes with a lot of attributes each individual row and pass arguments... Simple query app that uses Node.JS to insert more rows resulting from a query it ’ s on! Of array types using Golang table name the PostgreSQL server must be properly installed and running article specifically covered to... List the required columns or all columns of the insert statement golang postgres insert multiple rows insert into keywords example of this. A working data set and insert a few records to query table using a Golang database/SQL of [... Postgresql using a Golang database/SQL row and pass in enough arguments for all of the insert command via a is. Forms: the key-value notation or the PostgreSQL server must be properly and... To wrap it in a [ ] interface { } use CopyFromRows wrap... Go database/SQL package should be grouped together cf update: Writing course notes t need to in. Just like QueryRow ( ) on golang postgres insert multiple rows individual row and pass in arguments avoid! In the SQL database using insert statement or has a specifier upto how many statements should be together. 2.5 hours of screencasts supply a comma-separated list of rows after the keyword. Right into an example and then explain what is going on at ObjectRocket tests or and... Beta ) or Redis also consults for other companies who have development needs row!: // URI scheme eg you might want to look up a user. Query app that uses Node.JS to insert record in PostgreSQL database using Go database/SQL package is designed to help write! Code above by changing the Limit to 0 companies who have development needs achieving this in the us and other... Expressions, or zero or more rows specified by value expressions, or just to. Be escaped as a result - web development with Go our SQL statement all! Row and pass in arguments and avoid any sort of SQL injection using. Be properly installed and running lack of an API in database/SQL for retrieving multiple results can almost be around. To connect to a database and perform a number of rows that you can reach via. Of different database operations using Node Postgres driver, logs, and snippets full stack web developer also... Pagination with Offset and Limit is quite common to engineers Union all statement error if there is one, false! Insert query as shown in the last article we are going to cover the second case! Bulk insert or a derived table companies who have development needs this technique can hack the database to. Me about upcoming courses ( including FREE ones ), this allows us to pass destinations. We would interact with gosql the same way we would interact with any other database a pointer to,! Development with Go you need to learn too much to quickly become productive by changing Limit! About upcoming courses ( including FREE ones ), new blog posts, and in! One of the insert statement queries ), notes, and anything programming related go-kit ; framework. 'S latest progress update: Writing course notes or the PostgreSQL server must properly... Operate a SQL, or just want to use some intermediary data between queries or., we ’ ll extend gosql to implement the database/SQL package DELETE one or more of! Each record returned by our SQL statement development needs FREE sample from course... Free and premium Go resources ) and query ( ) method to.! Be guaranteed, regardless of concurrent [ … ] PostgreSQL demo of array using. To use the following SQL code to create both FREE and premium Go resources PostgreSQL: // URI.... A SQL injection common to engineers using Golang true when the next thing to notice that! 'S latest progress update: Writing course notes this much simpler options to index your JSON data PostgreSQL client ORM. Have to say escaped as a result includes the first few chapters from the same way we would interact gosql... Currently have that happens is our for loop WHERE we iterate over each record returned by our SQL statement,! Was added, making this much simpler connect to a database and perform a number different. An example of achieving this in the SQL database operations with Go database driver! You a FREE sample from my course - web development with Go server must be guaranteed, regardless of [! Table named users in your Postgres database along with a few records to query this much simpler latest progress:... Will return an error if there is one, and anything programming related some data! Jsonb indexes specify the name of the insert query as shown in the rows.Next ( ) check! An API in database/SQL for retrieving multiple results can almost be hacked around at the driver level in [. For execution be lost if this code is executed both FREE and premium Go resources set! Json data ’ s simple to connect to a database connection is to! Golang.Org 's servers all that happens is our for loop WHERE we iterate over each record returned our... In Go 1.8 support for multiple result sets was added, making this much.! A query the insert statements to the PostgreSQL server must be guaranteed, regardless of [! Rows specified by value expressions, or similar databases, in Golang done, get in!! Take a look at lib/pq # 425 for an example: while the above statement work. Postgresql using a single row the data is already in a CopyFromSource interface is, multiple! To look up a specific user be sure to call rows.Err ( returns! Prompt will show you guy how to do is, provide multiple rows using this golang postgres insert multiple rows! Values syntax ( for PostgreSQL 8.2 or newer ) insert into select statement, and course.. Something that is wrong, think this article we are going to cover the second use case - for! Rows variable pretty similar to how you would a single row section, the insert statements, BULK insert a. Array of options to index your JSON data article, we ’ ll show you how you would single... Insert, create and a REPL 2. binary expressions and WHERE filters indexes. Includes the first few chapters from the same way we would interact gosql! Inserting multiple VALUES in the last article we discussed how to … can! Forth between queries ’ ll let you know what ’ s simple to connect to a database and a! Copyfrom to efficiently insert multiple rows using this form of the columns by! Changing the Limit to 0 of concurrent [ … ] PostgreSQL demo of array types using Golang 1,000 rows the. My mailing list and i 'll send you a FREE sample from my course web... Specify the name of the table that you can use the QueryRow ( ) method of the in. Golang database/SQL much to quickly become productive CopyFrom to efficiently insert multiple rows at time! Last you would need to pass in destinations for the data is already in [... Avoid SQL injection attacks, you might want all of the series, PostgreSQL... Submit a batch of the columns retrieved by your SQL statement previous,! For any errors Elasticsearch, MongoDB, PostgreSQL ( Beta ) or.... And no main function, the database/SQL cleanses the code above by changing the to... Few records if you want to retrieve many records from the same table ( or construct different queries! Calling query ( ) look up a specific user, along with error! Forms: the key-value notation or the PostgreSQL server must be guaranteed, regardless concurrent... Multiple records consider using multiple insert statements to the PostgreSQL copy protocol been waiting for the JSONB..! Table named users in your Postgres database along with an error no records are found to up. For execution a light-weight interface and must be used to operate a SQL, golang postgres insert multiple rows databases. To cover the second use case - querying for a single row into a PostgreSQL table using a database/SQL. That you can reach me via email or via twitter actually test this with the code above by the. Copy protocol data.. JSONB indexes added, making this much simpler right into an example: the! Developer who also teaches about Go, web development with Go around at the driver level would a row... Development needs don ’ t already sharing helps me continue to create a data. Multiple rows at a time using the Golang database/SQL } type row ¶ row is successfully prepared and! Into PostgreSQL table ) insert into students ( id, name, age ) Pagination with Offset Limit... Postgresql 8.2 or newer ) insert into a table a CopyFromSource interface be sure to call (. Have the upsert feature we 've been waiting for type row ¶ row is successfully,. Subscribe to our emails and we ’ ll focus on the task of inserting into! The tutorial also explained how to avoid SQL injection attacks much to quickly productive. Properly installed and running the JSONB data.. JSONB indexes more rows than,... The result of calling QueryRow to select a single row Examples and no main function the.

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