How to use SQL query builder with Aura.SqlQuery?

Aura.SqlQuery is a SQL query builder designed to provide a convenient, scalable, testable, and maintainable way to build SQL queries. Through Aura.SqlQuery, users do not need to manually write SQL statements, but use a series of simple functions to build queries, which can reduce code maintenance costs and improve code readability and maintainability.

The steps to use Aura.SqlQuery to generate SQL queries are roughly as follows:

1. Install Aura.SqlQuery

You can add Aura.SqlQuery to your application through Composer in the project.

composer require aura/sqlquery

2. Create a query object

Before using Aura.SqlQuery, you need to create a query object first, usually using select , update, delete and other methods to create a new query object.

For example, use the select method to create a query object:

$query = $queryFactory->newSelect();

3. Configuring the query object

After creating the query object, you can use a series of methods To configure the query object, for example:

• from: Specify the table name of the query.
• columns: Specify the columns of the query.
• where: Specify the query conditions.
• order_by: Specifies the order of the query.

For example, use the from and columns methods to configure the query object:

$query->from('users')
      ->columns([
          'id',
          'name',
          'email'
      ]);

4. Execute the query

After configuring the query object, call __toString () method can get the complete SQL query statement. For example:

$sql = $query->__toString();

5. Bind parameters

During the query execution process, you may need to bind some parameters, for example:

$query->where('name = :name')
      ->bindValue('name', 'John');

6. Union Query

You can use the union and unionAll methods to perform union queries. For example:

$subquery1 = $queryFactory->newSelect();
$subquery2 = $queryFactory->newSelect();

$subquery1->from('users')
          ->where('age < :age')
          ->bindValue('age', 18);

$subquery2->from('users')
          ->where('age >= :age')
          ->bindValue('age', 18);

$query->union($subquery1, $subquery2);

The above steps are the basic process of using Aura.SqlQuery to generate SQL queries. Use Aura.SqlQuery to easily build SQL queries and reduce the tediousness of hand-written SQL statements. When using Aura.SqlQuery, it should be noted that the query object can be reused, and the query object will not directly perform query operations. It needs to execute the query through PDO or other DBMS libraries. At the same time, Aura.SqlQuery provides many other functions, such as using the __clone() method to copy the query object, using the prefix method to set the table prefix, using the joins method to perform join operations, and so on. These features can help developers build SQL queries more easily and improve code readability and maintainability.

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