GitHub - rcronin/node-odbc: ODBC bindings for node

node-odbc

An asynchronous/synchronous interface for node.js to unixODBC and its supported drivers.

requirements

unixODBC binaries and development libraries for module compilation
- on Ubuntu/Debian sudo apt-get install unixodbc unixodbc-dev
- on RedHat/CentOS sudo yum install unixODBC unixODBC-devel
- on OSX
  - using macports.org sudo port unixODBC
  - using brew brew install unixODBC
- on IBM i yum install unixODBC unixODBC-devel (requires yum)
odbc drivers for target database
properly configured odbc.ini and odbcinst.ini.

install

node-odbc is an ODBC database interface for Node.js. It allows connecting to any database management system if the system has been correctly configured, including installing of unixODBC and unixODBC-devel packages, installing an ODBC driver for your desired database, and configuring your odbc.ini and odbcinst.ini files. By using an ODBC, and it makes remote development a breeze through the use of ODBC data sources, and switching between DBMS systems is as easy as modifying your queries, as all your code can stay the same.

Installation

Instructions on how to set up your ODBC environment can be found in the SETUP.md. As an overview, three main steps must be done before node-odbc can interact with your database:

Install unixODBC and unixODBC-devel: Compilation of node-odbc on your system requires these packages to provide the correct headers.
- Ubuntu/Debian: sudo apt-get install unixodbc unixodbc-dev
- RedHat/CentOS: sudo yum install unixODBC unixODBC-devel
- OSX:
  - macports.org: sudo port unixODBC
  - using brew: brew install unixODBC
- IBM i: yum install unixODBC unixODBC-devel (requires yum)
Install ODBC drivers for target database: Most database management system providers offer ODBC drivers for their product. See the website of your DBMS for more information.
odbc.ini and odbcinst.ini: These files define your DSNs (data source names) and ODBC drivers, respectively. They must be set up for ODBC functions to correctly interact with your database.

When all these steps have been completed, install node-odbc into your Node.js project by using:

npm install odbc

Important Changes in 2.0

node-odbc has recently been upgraded from its initial release. The following list highlights the major improvements and potential code-breaking changes.

Promise support: All asynchronous functions can now be used with native JavaScript Promises. If a callback function is not passed, the ODBC functions will return a native Promise. If a callback is passed to the ODBC functions, then the old callback behavior will be used.
Performance improvements: The underlying ODBC function calls have been reworked to greatly improve performance. For ODBC afficianados, node-odbc used to retrieved results using SQLGetData, which works for small amounts of data but is slow for large datasets. node-odbc now uses SQLBindCol for binding result sets, which for large queries is orders of magnitude faster.
Rewritten with N-API: node-odbc was completely rewritten using node-addon-api, a C++ wrapper for N-API, which created an engine-agnostic and ABI-stable package. This means that if you upgrade your Node.js version, there is no need to recompile the package, it just works!
API Changes: The API has been changed and simplified. See the documentation below for a list of all the changes.

Callbacks or Promises

Every asynchronous function in the Node.js node-odbc package can be called with either a callback Function or a Promise. To use Promises, simply do not pass a callback function (in the API docs below, specified with a callback?). This will return a Promise object than can then be used with .then or the more modern async/await workflow. To use callbacks, simply pass a callback function. For each function explained in the documents below, both Callback and Promise examples are given.

All examples are shown using IBM i Db2 DSNs and queries. Because ODBC is DBMS-agnostic, examples will work as long as the query strings are modified for your particular DBMS.

Result Array

All functions that return a result set do so in an array, where each row in the result set is an entry in the array. The format of data within the row can either be an array or an object, depending on the configuration option passed to the connection.

The result array also contains several properties:

count: the number of rows affected by the statement or procedure. Returns the result from ODBC function SQLRowCount.
columns: a list of columns in the result set. This is returned in an array. Each column in the array has the following properties:
- name: The name of the column
- dataType: The data type of the column properties
statement: The statement used to return the result set
parameters: The parameters passed to the statement or procedure. For input/output and output parameters, this value will reflect the value updated from a procedure.
return: The return value from some procedures. For many DBMS, this will always be undefined.

[ { CUSNUM: 938472,
    LSTNAM: 'Henning ',
    INIT: 'G K',
    STREET: '4859 Elm Ave ',
    CITY: 'Dallas',
    STATE: 'TX',
    ZIPCOD: 75217,
    CDTLMT: 5000,
    CHGCOD: 3,
    BALDUE: 37,
    CDTDUE: 0 },
  { CUSNUM: 839283,
    LSTNAM: 'Jones   ',
    INIT: 'B D',
    STREET: '21B NW 135 St',
    CITY: 'Clay  ',
    STATE: 'NY',
    ZIPCOD: 13041,
    CDTLMT: 400,
    CHGCOD: 1,
    BALDUE: 100,
    CDTDUE: 0 },
  statement: 'SELECT * FROM QIWS.QCUSTCDT',
  parameters: [],
  return: undefined,
  count: -1,
  columns: [ { name: 'CUSNUM', dataType: 2 },
    { name: 'LSTNAM', dataType: 1 },
    { name: 'INIT', dataType: 1 },
    { name: 'STREET', dataType: 1 },
    { name: 'CITY', dataType: 1 },
    { name: 'STATE', dataType: 1 },
    { name: 'ZIPCOD', dataType: 2 },
    { name: 'CDTLMT', dataType: 2 },
    { name: 'CHGCOD', dataType: 2 },
    { name: 'BALDUE', dataType: 2 },
    { name: 'CDTDUE', dataType: 2 } ] ]

In this example, two rows are returned, with eleven columns each. The format of these columns is found on the columns property, with their names and dataType (which are integers mapped to SQL data types).

With this result structure, users can iterate over the result set like any old array (in this case, results.length would return 2) while also accessing important information from the SQL call and result set.

Connection

A Connection is your means of connecting to the database through ODBC.

`constructor: odbc.connect(connectionString)`

In order to get a connection, you must use the .connect function exported from the module. This asynchronously creates a Connection and gives it back to you. Like all asynchronous functions, this can be done either with callback functions or Promises.

Parameters:

connectionString: The connection string to connect to the database, usually by naming a DSN. Can also be a configuration object with the following properties:
- connectionString REQUIRED: The connection string to connect to the database
- connectionTimeout: How long before an idle connection will close, in seconds
- loginTimeout: How long before the connection process will attempt to connect before timing out, in seconds.
{OPTIONAL} callback: The function called when .connect has finished connecting. If no callback function is given, .connect will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- connection: The Connection object if a successful connection was made

Examples:

Promises

const odbc = require('odbc');

async function connectToDatabase() {
    const connection1 = await odbc.connect('DSN=MYDSN');
    // connection1 is now an open Connection

    // or using a configuration object
    const connectionConfig = {
        connectionString: 'DSN=MYDSN',
        connectionTimeout: 10,
        loginTimeout: 10,
    }
    const connection2 = await odbc.connect(connectionConfig);
    // connection2 is now an open Connection
}

connectToDatabase();

Callbacks

const odbc = require('odbc');
odbc.connect(connectionString, (error, connection) => {
    // connection is now an open Connection
});

Once a Connection has been created with odbc.connect, you can use the following functions on the connection:

`.query(sql, parameters?, callback?)`

Run a query on the database. Can be passed an SQL string with parameter markers ? and an array of parameters to bind to those markers. Returns a result array.

Parameters:

sql: The SQL string to execute
parameters?: An array of parameters to be bound the parameter markers (?)
{OPTIONAL} callback: The function called when .query has finished execution. If no callback function is given, .query will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result object from execution

const odbc = require('odbc');
const connection = odbc.connect(connectionString (error, connection) => {
    connection.query('SELECT * FROM QIWS.QCUSTCDT', (error, result) => {
        if (error) { console.error(error) }
        console.log(result);
    });
});

`.callProcedure(catalog, schema, name, parameters?, callback?)`

Calls a database procedure, returning the results in a result array.

Parameters:

catalog: The name of the catalog where the procedure exists, or null to use the default catalog
schema: The name of the schema where the procedure exists, or null to use a default schema
name: The name of the procedure in the database
{OPTIONAL} parameters: An array of parameters to pass to the procedure. For input and input/output parameters, the JavaScript value passed in is expected to be of a type translatable to the SQL type the procedure expects. For output parameters, any JavaScript value can be passed in, and will be overwritten by the function. The number of parameters passed in must match the number of parameters expected by the procedure.
{OPTIONAL} callback: The function called when .callProcedure has finished execution. If no callback function is given, .callProcedure will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result object from execution

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function callProcedureExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    // now have a statement where sql can be prepared, bound, and executed
}

callProcedureExample();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.callProcedure(null, null, 'MY_PROC', [undefined], (error, result) => {
        if (error) { console.error(error) } // handle
        // result contains an array of results, and has a `parameters` property to access parameters returned by the procedure.
        console.log(result);
    });
});

`.createStatement(callback?)`

Returns a Statement object from the connection.

Parameters:

{OPTIONAL} callback: The function called when .createStatement has finished execution. If no callback function is given, .createStatement will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- statement: The newly created Statement object

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function statementExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    // now have a statement where sql can be prepared, bound, and executed
}

statementExample();

Callbacks

const odbc = require('odbc');

// returns information about all tables in schema MY_SCHEMA
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.createStatement((error, statement) => {
        if (error) { return; } // handle
        // now have a statement where sql can be prepared, bound, and executed
    });
});

`.tables(catalog, schema, table, type, callback?)`

Returns information about the table specified in the parameters by calling the ODBC function SQLTables. Values passed to parameters will narrow the result set, while null will include all results of that level.

Parameters:

catalog: The name of the catalog, or null if not specified
schema: The name of the schema, or null if not specified
table: The name of the table, or null if not specified
type: The type of table that you want information about, or null if not specified
{OPTIONAL} callback: The function called when .tables has finished execution. If no callback function is given, .tables will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result object from execution

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function getTables() {
    // returns information about all tables in schema MY_SCHEMA
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const result = await connection.tables(null, 'MY_SCHEMA', null, null);
    console.log(result);
}

getTables();

Callbacks

const odbc = require('odbc');

// returns information about all tables in schema MY_SCHEMA
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.columns(null, "MY_SCHEMA", null, null, (error, result) => {
        if (error) { return; } // handle
        console.log(result);
    });
});

`.columns(catalog, schema, table, column, callback?)`

Returns information about the columns specified in the parameters by calling the ODBC function SQLColumns. Values passed to parameters will narrow the result set, while null will include all results of that level.

Parameters:

catalog: The name of the catalog, or null if not specified
schema: The name of the schema, or null if not specified
table: The name of the table, or null if not specified
column: The name of the column that you want information about, or null if not specified
{OPTIONAL} callback: The function called when .columns has finished execution. If no callback function is given, .columns will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result object from execution

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function getColumns() {
    // returns information about all columns in table MY_SCEHMA.MY_TABLE
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const result = await connection.columns(null, 'MY_SCHEMA', 'MY_TABLE', null);
    console.log(result);
}

getColumns();

Callbacks

const odbc = require('odbc');

// returns information about all columns in table MY_SCEHMA.MY_TABLE
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.columns(null, "MY_SCHEMA", "MY_TABLE", null, (error, result) => {
        if (error) { return; } // handle
        console.log(result);
    });
});

`.beginTransaction(callback?)`

Begins a transaction on the connection. The transaction can be committed by calling .commit or rolled back by calling .rollback. If a connection is closed with an open transaction, it will be rolled back. Connection isolation level will affect the data that other transactions can view mid transaction.

Parameters:

{OPTIONAL} callback: The function called when .beginTransaction has finished execution. If no callback function is given, .beginTransaction will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function transaction() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    await connection.beginTransaction();
    // transaction is now open
}

transaction();

Callbacks

const odbc = require('odbc');

// returns information about all columns in table MY_SCEHMA.MY_TABLE
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.beginTransaction((error) => {
        if (error) { return; } // handle
        // transaction is now open
    });
});

`.commit(callback?)`

Commits an open transaction. If called on a connection that doesn't have an open transaction, will no-op.

Parameters:

{OPTIONAL} callback: The function called when .commit has finished execution. If no callback function is given, .commit will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function commitTransaction() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    await connection.beginTransaction();
    const insertResult = await connection.query('INSERT INTO MY_TABLE VALUES(1, \'Name\')');
    await connection.commit();
    // INSERT query has now been committed
}

commitTransaction();

Callbacks

const odbc = require('odbc');

// returns information about all columns in table MY_SCEHMA.MY_TABLE
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.beginTransaction((error1) => {
        if (error1) { return; } // handle
        connection.query('INSERT INTO MY_TABLE VALUES(1, \'Name\')', (error2, result) => {
            if (error2) { return; } // handle
            connection.commit((error3) => {
                // INSERT query has now been committed
            })
        })
    });
});

`.rollback(callback?)`

Rolls back an open transaction. If called on a connection that doesn't have an open transaction, will no-op.

Parameters:

{OPTIONAL} callback: The function called when .rollback has finished execution. If no callback function is given, .rollback will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function rollbackTransaction() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    await connection.beginTransaction();
    const insertResult = await connection.query('INSERT INTO MY_TABLE VALUES(1, \'Name\')');
    await connection.rollback();
    // INSERT query has now been rolled back
}

rollbackTransaction();

Callbacks

const odbc = require('odbc');

// returns information about all columns in table MY_SCEHMA.MY_TABLE
odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.beginTransaction((error1) => {
        if (error1) { return; } // handle
        connection.query('INSERT INTO MY_TABLE VALUES(1, \'Name\')', (error2, result) => {
            if (error2) { return; } // handle
            connection.rollback((error3) => {
                // INSERT query has now been rolled back
            })
        })
    });
});

`.close(callback?)`

Closes and open connection. Any transactions on the connection that have not been ended will be rolledback.

Parameters:

{OPTIONAL} callback: The function called when .close has finished clsoing the connection. If no callback function is given, .close will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function closeConnection() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    // do something with your connection here
    await connection.close();
}

rollbackTransaction();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
   // do something with your connection here
   connection.close((error) => {
       if (error) { return; } // handle
       // connection is now closed
   })
});

Pool

`constructor: odbc.pool(connectionString)`

In order to get a Pool, you must use the .pool function exported from the module. This asynchronously creates a Pool of a number of Connections and returns it to you. Like all asynchronous functions, this can be done either with callback functions or Promises.

Note that odbc.pool will return from callback or Promise as soon as it has created 1 connection. It will continue to spin up Connections and add them to the Pool in the background, but by returning early it will allow you to use the Pool as soon as possible.

Parameters:

connectionString: The connection string to connect to the database for all connections in the pool, usually by naming a DSN. Can also be a configuration object with the following properties:
- connectionString REQUIRED: The connection string to connect to the database
- connectionTimeout: How long before an idle connection will close, in seconds
- loginTimeout: How long before the connection process will attempt to connect before timing out, in seconds.
- initialSize: The initial number of Connections created in the Pool
- incrementSzie: How many additional Connections to create when all of the Pool's connections are taken
- maxSize: The maximum number of open Connections the Pool will create
- shrink: Whether or not the number of Connections should shrink to initialSize as they free up
{OPTIONAL} callback: The function called when .connect has finished connecting. If no callback function is given, .connect will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- connection: The Connection object if a successful connection was made

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function createPool() {
    const pool = await odbc.pool(`${process.env.CONNECTION_STRING}`);
    // can now do something with the Pool
}

createPool();

Callbacks

const odbc = require('odbc');
const pool = odbc.pool('DSN=MyDSN', (error, pool) => {
    // pool now has open connections
});

`.connect(callback?)`

Returns a Connection object for you to use from the Pool. Doesn't actually open a connection, because they are already open in the pool when .init is called.

Parameters:

{OPTIONAL} callback: The function called when .connect has finished execution. If no callback function is given, .connect will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- connection: The Connection retrieved from the Pool.

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function connectExample() {
    const pool = await odbc.pool(`${process.env.CONNECTION_STRING}`);
    const connection = await pool.connect();
    // now have a Connection to do work with
}

connectExample();

Callbacks

const odbc = require('odbc');
odbc.pool(`${process.env.CONNECTION_STRING}`, (error1, pool) => {
    if (error1) { return; } // handle
    pool.connect((error2, connection) => {
        if (error2) { return; } // handle
        // now have a Connection to do work with
    });
});

`.query(sql, parameters?, callback?)`

Utility function to execute a query on any open connection in the pool. Will get a connection, fire of the query, return the results, and return the connection the the pool.

Parameters:

sql: An SQL string that will be executed. Can optionally be given parameter markers (?) and also given an array of values to bind to the parameters.
{OPTIONAL} parameters: An array of values to bind to the parameter markers, if there are any. The number of values in this array must match the number of parameter markers in the sql statement.
{OPTIONAL} callback: The function called when .query has finished execution. If no callback function is given, .query will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result array returned from the executed statement

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function queryExample() {
    const pool = await odbc.pool(`${process.env.CONNECTION_STRING}`);
    const result = await pool.query('SELECT * FROM MY_TABLE');
    console.log(result);
}

queryExample();

Callbacks

const odbc = require('odbc');
odbc.pool(`${process.env.CONNECTION_STRING}`, (error1, pool) => {
    if (error1) { return; } // handle
    pool.query('SELECT * FROM MY_TABLE', (error2, result) => {
        if (error2) { return; } // handle
        console.log(result);
    });
});

`.close(callback?)`

Closes the entire pool of currently unused connections. Will not close connections that are checked-out, but will discard the connections when they are closed with Connection's .close function. After calling close, must create a new Pool sprin up new Connections.

Parameters:

{OPTIONAL} callback: The function called when .close has finished execution. If no callback function is given, .close will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function closeExample() {
    const pool = await odbc.pool(`${process.env.CONNECTION_STRING}`);
    await pool.close();
    // pool is now closed
}

closeExample();

Callbacks

const odbc = require('odbc');

odbc.pool(`${process.env.CONNECTION_STRING}`, (error1, pool) => {
    if (error1) { return; } // handle
    // do something with your pool here
    pool.close((error2) => {
        if (error2) { return; } // handle
        // pool is now closed
    });
});

Statement

A Statement object is created from a Connection, and cannot be created ad hoc with a constructor.

Statements allow you to prepare a commonly used statement, then bind parameters to it multiple times, executing in between.

`.prepare(sql, callback?)`

Prepares an SQL statement, with or without parameters (?) to bind to.

Parameters:

sql: An SQL string that is prepared and can be executed with the .execute function.
{OPTIONAL} callback: The function called when .prepare has finished execution. If no callback function is given, .prepare will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function prepareExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    await statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)');
    // statement has been prepared, can bind and execute
}

prepareExample();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.createStatement((error1, statement) => {
        if (error1) { return; } // handle
        statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)' (error2) => {
            if (error2) { return; } // handle
            // statement has been prepared, can bind and execute
        });
    });
});

`.bind(parameters, callback?)`

Binds an array of values to the parameters on the prepared SQL statement. Cannot be called before .prepare.

Parameters:

sql: An array of values to bind to the sql statement previously prepared. All parameters will be input parameters. The number of values passed in the array must match the number of parameters to bind to in the prepared statement.
{OPTIONAL} callback: The function called when .bind has finished execution. If no callback function is given, .bind will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function bindExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    await statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)');
    // Assuming MY_TABLE has INTEGER and VARCHAR fields.
    await statement.bind([1, 'Name']);
    // statement has been prepared and values bound, can now execute
}

bindExample();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.createStatement((error1, statement) => {
        if (error1) { return; } // handle
        statement.prepare('INSERT INTO MY_TABLE VALUES(?, ?)' (error2) => {
            if (error2) { return; } // handle
            // Assuming MY_TABLE has INTEGER and VARCHAR fields.
            statement.bind([1, 'Name'], (error3) => {
                if (error3) { return; } // handle
                // statement has been prepared and values bound, can now execute
            });
        });
    });
});

`.execute(callback?)`

Executes the prepared and optionally bound SQL statement.

Parameters:

{OPTIONAL} callback: The function called when .execute has finished execution. If no callback function is given, .execute will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error
- result: The result array returned from the executed statement

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function executeExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    await statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)');
    // Assuming MY_TABLE has INTEGER and VARCHAR fields.
    await statement.bind([1, 'Name']);
    const result = await statement.execute();
    console.log(result);
    
}

executeExample();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.createStatement((error1, statement) => {
        if (error1) { return; } // handle
        statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)' (error2) => {
            if (error2) { return; } // handle
            // Assuming MY_TABLE has INTEGER and VARCHAR fields.
            statement.bind([1, 'Name'], (error3) => {
                if (error3) { return; } // handle
                statement.execute((error4, result) => {
                    if (error4) { return; } // handle
                    console.log(result);
                })
            });
        });
    });
});

`.close(callback?)`

Closes the Statement, freeing the statement handle. Running functions on the statement after closing will result in an error.

Parameters:

{OPTIONAL} callback: The function called when .close has finished execution. If no callback function is given, .close will return a native JavaScript Promise. Callback signature is:
- error: The error that occured in execution, or null if no error

Examples:

Promises

const odbc = require('odbc');

// can only use await keyword in an async function
async function executeExample() {
    const connection = await odbc.connect(`${process.env.CONNECTION_STRING}`);
    const statement = await connection.createStatement();
    await statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)');
    // Assuming MY_TABLE has INTEGER and VARCHAR fields.
    await statement.bind([1, 'Name']);
    const result = await statement.execute();
    console.log(result);
    await statement.close();
}

executeExample();

Callbacks

const odbc = require('odbc');

odbc.connect(`${process.env.CONNECTION_STRING}`, (error, connection) => {
    connection.createStatement((error1, statement) => {
        if (error1) { return; } // handle
        statement.prepare('INSTERT INTO MY_TABLE VALUES(?, ?)' (error2) => {
            if (error2) { return; } // handle
            // Assuming MY_TABLE has INTEGER and VARCHAR fields.
            statement.bind([1, 'Name'], (error3) => {
                if (error3) { return; } // handle
                statement.execute((error4, result) => {
                    if (error4) { return; } // handle
                    console.log(result);
                    statement.close((error5) => {
                        if (error5) { return; } // handle
                        // statement closed successfully
                    })
                })
            });
        });
    });
});

Future improvements

Development of node-odbc is an ongoing endeavor, and there are many planned improvements for the package. If you would like to see something, simply add it to the Issues and we will respond!

contributors

Mark Irish (mirish@ibm.com)
Dan VerWeire (dverweire@gmail.com)
Lee Smith (notwink@gmail.com)
Bruno Bigras
Christian Ensel
Yorick
Joachim Kainz
Oleg Efimov
paulhendrix

license

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies ofthe Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Name		Name	Last commit message	Last commit date
Latest commit History 740 Commits
lib		lib
src		src
test		test
.eslintrc.js		.eslintrc.js
.gitignore		.gitignore
.npmignore		.npmignore
LICENSE		LICENSE
README.md		README.md
binding.gyp		binding.gyp
package-lock.json		package-lock.json
package.json		package.json

License

rcronin/node-odbc

Folders and files

Latest commit

History

Repository files navigation

node-odbc

requirements

install

Installation

Important Changes in 2.0

API

Callbacks or Promises

Result Array

Connection

constructor: odbc.connect(connectionString)

Parameters:

Examples:

.query(sql, parameters?, callback?)

Parameters:

.callProcedure(catalog, schema, name, parameters?, callback?)

Parameters:

Examples:

.createStatement(callback?)

Parameters:

Examples:

.tables(catalog, schema, table, type, callback?)

Parameters:

Examples:

.columns(catalog, schema, table, column, callback?)

Parameters:

Examples:

.beginTransaction(callback?)

Parameters:

Examples:

.commit(callback?)

Parameters:

Examples:

.rollback(callback?)

Parameters:

Examples:

.close(callback?)

Parameters:

Examples:

Pool

constructor: odbc.pool(connectionString)

Parameters:

Examples:

.connect(callback?)

Parameters:

Examples:

.query(sql, parameters?, callback?)

Parameters:

Examples:

.close(callback?)

Parameters:

Examples:

Statement

.prepare(sql, callback?)

Parameters:

Examples:

.bind(parameters, callback?)

Parameters:

Examples:

.execute(callback?)

Parameters:

Examples:

.close(callback?)

Parameters:

Examples:

Future improvements

contributors

license

About

Resources

License

Stars

Watchers

Forks

Releases

`constructor: odbc.connect(connectionString)`

`.query(sql, parameters?, callback?)`

`.callProcedure(catalog, schema, name, parameters?, callback?)`

`.createStatement(callback?)`

`.tables(catalog, schema, table, type, callback?)`

`.columns(catalog, schema, table, column, callback?)`

`.beginTransaction(callback?)`

`.commit(callback?)`

`.rollback(callback?)`

`.close(callback?)`

`constructor: odbc.pool(connectionString)`

`.connect(callback?)`

`.query(sql, parameters?, callback?)`

`.close(callback?)`

`.prepare(sql, callback?)`

`.bind(parameters, callback?)`

`.execute(callback?)`

`.close(callback?)`

Packages