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  • REFERENCE
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              • Download the COVIDcast data
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                  • ingest-the-data.sql
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> Drivers and ORMs > Go >

Go drivers

Report a doc issue Suggest new content Contributor guide
  • CRUD operations with PQ driver
    • Step 1: Import the driver package
    • Step 2: Connect to YugabyteDB database
    • Step 3: Create tables
    • Step 4: Read and write data
  • Next steps

For Go Applications, most drivers provide database connectivity through the standard database/sql API. YugabyteDB supports the PGX Driver and the PQ Driver.

  • PGX Driver
  • PQ Driver

The PQ driver is a popular driver for PostgreSQL. Use the driver to connect to YugabyteDB to execute DMLs and DDLs using the standard database/sql package.

CRUD operations with PQ driver

Learn how to establish a connection to YugabyteDB database and begin basic CRUD operations using the steps in the Build an application page under the Quick start section.

The following sections break down the quick start example to demonstrate how to perform common tasks required for Go application development using the PQ driver.

Step 1: Import the driver package

Import the PQ driver package by adding the following import statement in your Go code.

import (
  _ "github.com/lib/pq"
)

Step 2: Connect to YugabyteDB database

Go applications can connect to YugabyteDB using the sql.Open() function. The sql package includes all the functions or structs required for working with YugabyteDB.

Use the sql.Open() function to create a connection object for the YugabyteDB database. This can be used for performing DDLs and DMLs against the database.

The connection details can be specified either as string parameters or via a URL in the following format:

postgresql://username:[email protected]:port/database

Code snippet for connecting to YugabyteDB:

psqlInfo := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s",
                        host, port, user, password, dbname)
// Other connection configs are read from the standard environment variables:
// PGSSLMODE, PGSSLROOTCERT, and so on.
db, err := sql.Open("postgres", psqlInfo)
defer db.Close()
if err != nil {
    log.Fatal(err)
}
Parameter Description Default
host hostname of the YugabyteDB instance localhost
port Listen port for YSQL 5433
user user for connecting to the database yugabyte
password password for connecting to the database yugabyte
dbname database name yugabyte

Use SSL

For a YugabyteDB Managed cluster, or a YugabyteDB cluster with SSL/TLS enabled, set the SSL-related environment variables as below at the client side.

$ export PGSSLMODE=verify-ca
$ export PGSSLROOTCERT=~/root.crt  # Here, the CA certificate file is downloaded as `root.crt` under home directory. Modify your path accordingly.
Environment Variable Description
PGSSLMODE SSL mode used for the connection
PGSSLROOTCERT Server CA Certificate

Step 3: Create tables

Execute an SQL statement such as DDL CREATE TABLE ... using the Exec() function on the db instance.

The CREATE DDL statement:

CREATE TABLE employee (id int PRIMARY KEY, name varchar, age int, language varchar)

Code snippet:

var createStmt = `CREATE TABLE employee (id int PRIMARY KEY,
                                         name varchar,
                                         age int,
                                         language varchar)`;
if _, err := db.Exec(createStmt); err != nil {
    log.Fatal(err)
}

The db.Exec() function also returns an error object which, if not nil, needs to be handled in your code.

Read more on designing Database schemas and tables.

Step 4: Read and write data

Insert data

To write data into YugabyteDB, execute the INSERT statement using the same db.Exec() function.

The INSERT DML statement:

INSERT INTO employee(id, name, age, language) VALUES (1, 'John', 35, 'Go')

Code snippet:

var insertStmt string = "INSERT INTO employee(id, name, age, language)" +
    " VALUES (1, 'John', 35, 'Go')";
if _, err := db.Exec(insertStmt); err != nil {
    log.Fatal(err)
}

Query data

To query data from YugabyteDB tables, execute the SELECT statement using the function Query() on db instance.

Query results are returned as rows which can be iterated using rows.next() method. Use rows.Scan() for reading the data.

The SELECT DML statement:

SELECT * from employee;

Code snippet:

var name string
var age int
var language string
rows, err := db.Query(`SELECT name, age, language FROM employee WHERE id = 1`)
if err != nil {
    log.Fatal(err)
}
defer rows.Close()
fmt.Printf("Query for id=1 returned: ");
for rows.Next() {
    err := rows.Scan(&name, &age, &language)
    if err != nil {
       log.Fatal(err)
    }
    fmt.Printf("Row[%s, %d, %s]\n", name, age, language)
}
err = rows.Err()
if err != nil {
    log.Fatal(err)
}

Next steps

  • Learn how to build Go applications using GORM.
  • Learn more about fundamentals of the PQ Driver.
  • CRUD operations with PQ driver
    • Step 1: Import the driver package
    • Step 2: Connect to YugabyteDB database
    • Step 3: Create tables
    • Step 4: Read and write data
  • Next steps
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