# Class: SQLClient

## vertx-sql-js/sql_client~ SQLClient

#### new SQLClient()

A common asynchronous client interface for interacting with SQL compliant database

Source:
  - vertx-sql-js/sql_client.js, line 33

### Methods

#### close(handler)

Close the client and release all resources. Call the handler when close is complete.

##### Parameters:

Name | Type | Description
--- | --- | ---
`handler` | function | the handler that will be called when close is complete

Source:
  - vertx-sql-js/sql_client.js, line 117

#### getConnection(handler) → {SQLClient}

Returns a connection that can be used to perform SQL operations on. It's important to remember to close the connection when you are done, so it is returned to the pool.

##### Parameters:

Name | Type | Description
--- | --- | ---
`handler` | function | the handler which is called when the `JdbcConnection` object is ready for use.

Source:
  - vertx-sql-js/sql_client.js, line 96

##### Returns:

Type
  SQLClient

#### query(sql, handler) → {SQLClient}

Execute a single SQL statement, this method acquires a connection from the the pool and executes the SQL statement and returns it back after the execution.

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the statement to execute
`handler` | function | the result handler

Source:
  - vertx-sql-js/sql_client.js, line 141

##### Returns:

self

Type
  SQLClient

#### querySingle(sql, handler) → {SQLOperations}

Execute a one shot SQL statement that returns a single SQL row. This method will reduce the boilerplate code by getting a connection from the pool (this object) and return it back after the execution. Only the first result from the result set is returned.

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the statement to execute
`handler` | function | the result handler

Source:
  - vertx-sql-js/sql_client.js, line 49

##### Returns:

self

Type
  SQLOperations

#### querySingleWithParams(sql, arguments, handler) → {SQLOperations}

Execute a one shot SQL statement with arguments that returns a single SQL row. This method will reduce the boilerplate code by getting a connection from the pool (this object) and return it back after the execution. Only the first result from the result set is returned.

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the statement to execute
`arguments` | todo | the arguments
`handler` | function | the result handler

Source:
  - vertx-sql-js/sql_client.js, line 74

##### Returns:

self

Type
  SQLOperations

#### queryWithParams(sql, arguments, handler) → {SQLClient}

Execute a single SQL prepared statement, this method acquires a connection from the the pool and executes the SQL prepared statement and returns it back after the execution.

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the statement to execute
`arguments` | todo | the arguments to the statement
`handler` | function | the result handler

Source:
  - vertx-sql-js/sql_client.js, line 165

##### Returns:

self

Type
  SQLClient

#### update(sql, handler) → {SQLClient}

Executes the given SQL statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement.

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the SQL to execute. For example `INSERT INTO table ...`
`handler` | function | the handler which is called once the operation completes.

Source:
  - vertx-sql-js/sql_client.js, line 188

##### Returns:

Type
  SQLClient

#### updateWithParams(sql, params, handler) → {SQLClient}

Executes the given prepared statement which may be an `INSERT`, `UPDATE`, or `DELETE` statement with the given parameters

##### Parameters:

Name | Type | Description
--- | --- | ---
`sql` | string | the SQL to execute. For example `INSERT INTO table ...`
`params` | todo | these are the parameters to fill the statement.
`handler` | function | the handler which is called once the operation completes.

Source:
  - vertx-sql-js/sql_client.js, line 212

##### Returns:

Type
  SQLClient