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ch06.gs
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// Code Example 6.1
/**
* Return a MySQL connection for given parameters.
*
* This function will create and return a connection
* or throw an exception if it cannot create a connection
* using the given parameters.
*
* @param {String} host
* @param {String} user
* @param {String} pwd
* @param {String} dbName
* @param {number} port
* @return {JdbcConnection}
*/
function getConnection(host, user, pwd, dbName, port) {
var connectionUrl = ('jdbc:mysql://' + host + ':'
+ port + '/' + dbName),
connection;
try {
connection = Jdbc.getConnection(connectionUrl, user, pwd);
return connection
} catch (e) {
throw e;
}
}
// Code Example 6.2
/**
* Return a JDBC connection for my
* cloud-hosted MySQL
*
* You will need to modify the variable
* values for your own MySQL database.
* It calls "getConnection()".
*
* @return {JdbcConnection}
*/
function getConnectionToMyDB() {
var scriptProperties =
PropertiesService.getScriptProperties(),
pwd =
scriptProperties.getProperty('MYSQL_CLOUD_PWD'),
user = 'sql562209',
dbName = 'sql562209',
host = 'sql5.freemysqlhosting.net',
port = 3306,
connection;
connection = getConnection(host, user, pwd, dbName, port);
return connection;
}
/***
* Test getConnectionToMyDB()
* Prints "JdbcConnection" and closes
* the Connection object.
*
*/
function test_getConnectionToMyDB() {
var connection = getConnectionToMyDB();
Logger.log(connection);
connection.close();
}
// Code Example 6.3
/**
* Create a JDBC connection and
* execute a CREATE TABLE statement.
*
* return {undefined}
*/
function createTable() {
var connection,
ddl,
stmt;
ddl = 'CREATE TABLE people('
+ 'first_name VARCHAR(50) NOT NULL,\n'
+ 'surname VARCHAR(50) NOT NULL,\n'
+ 'gender VARCHAR(6),\n'
+ 'height_meter FLOAT(3,2),\n'
+ 'dob DATE)';
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
stmt.execute(ddl);
Logger.log('Table created!');
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code example 6.4
/**
* Execute a single SQL INSERT statement to
* add the table created by code example 6.3.
*
* @return {undefined}
*/
function populateTable() {
var connection,
stmt,
sql,
rowInsertedCount;
sql = "INSERT INTO people(first_name, surname, gender, height_meter, dob) VALUES\n"
+ "('John', 'Browne', 'Male', 1.81, '1980-05-03'),\n"
+ "('Rosa', 'Hernandez', 'Female', 1.70, '1981-04-30'),\n"
+ "('Mary', 'Carr', 'Male', 1.72, '1982-08-01'),\n"
+ "('Lee', 'Chang', 'Male', 1.88, '1973-07-15')";
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
rowInsertedCount = stmt.executeUpdate(sql);
Logger.log(rowInsertedCount + ' values inserted!');
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.5
/**
* Execute a SELECT statement to
* return all table rows
*
* Print rows to log viewer.
* @return {undefined}
*/
function selectFromTable() {
var connection,
stmt,
sql,
rs,
rsmd,
i,
colCount;
sql = 'SELECT * FROM people';
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
rs = stmt.executeQuery(sql);
rsmd = rs.getMetaData();
colCount = rsmd.getColumnCount();
while(rs.next()) {
for(i = 1; i <= colCount; i += 1) {
Logger.log(rs.getString(i) + ', ');
}
Logger.log('\n');
}
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.6
/**
* Execute an UPDATE statement.
*
*
* @return {undefined}
*/
function updateTable() {
var connection,
stmt,
sql,
updateRowCount;
sql = "UPDATE people SET gender = 'Female'\n"
+ "WHERE first_name = 'Mary' AND surname = 'Carr'";
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
updateRowCount = stmt.executeUpdate(sql);
Logger.log(updateRowCount + ' rows updated!');
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.7
/**
* Delete a row from the database
*
* Print the deleted row count to
* the log.
*
* @return {undefined}
*/
function deleteTableRow() {
var connection,
stmt,
sql,
deleteRowCount;
sql = "DELETE FROM people\n"
+ "WHERE first_name = 'Lee' AND surname = 'Chang'";
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
deleteRowCount = stmt.executeUpdate(sql);
Logger.log('Deleted row count = ' + deleteRowCount);
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.8
/**
* Drop the table from the database
*
* @return {undefined}
*/
function dropTable() {
var connection,
stmt,
ddl;
ddl = 'DROP TABLE IF EXISTS people';
try {
connection = getConnectionToMyDB();
stmt = connection.createStatement();
stmt.execute(ddl);
Logger.log('Table "people" dropped!');
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.9
/**
* Demonstrate the use of a prepared statement.
*
* Prints the name of an emplyee for a
* given parameter.
* @return {undefined}
*/
function runPrepStmt() {
var connection,
pStmt,
sql,
rs,
empName;
sql = 'SELECT ename FROM emp WHERE empno = ?';
try {
connection = getConnectionToMyDB();
pStmt = connection.prepareStatement(sql);
pStmt.setInt(1, 7839);
rs = pStmt.executeQuery();
rs.next();
empName = rs.getString(1);
Logger.log(empName);
} catch (e) {
Logger.log(e);
throw e;
} finally {
connection.close();
}
}
// Code Example 6.10
/**
* Show effect if switching off auto-commit.
*
* Give emplyee number 7900 ("JAMES") a
* 100-fold pay increase!
* But the change is "rolled back".
* Try changing "connection.rollback()" to
* "connection.commit()" and see the effect.
*/
function demoTransactions() {
var connection,
stmt,
sql = 'UPDATE emp SET sal = sal * 100 WHERE empno = 7900';
connection = getConnectionToMyDB();
connection.setAutoCommit(false);
stmt = connection.createStatement();
stmt.executeUpdate(sql);
connection.rollback();
connection.close();
}
// Code Example 6.11 - see file "ch06.sql".
// Code Example 6.12
/**
*Print some information about
* the target database to the logger.
*
* @return {undefined}
*/
function printConnectionMetaData() {
var connection = getConnectionToMyDB(),
metadata = connection.getMetaData();
Logger.log('Major Version: ' + metadata.getDatabaseMajorVersion());
Logger.log('Minor Version: ' + metadata.getDatabaseMinorVersion());
Logger.log('Product Name: ' + metadata.getDatabaseProductName());
Logger.log('Product Version: ' + metadata.getDatabaseProductVersion());
Logger.log('Supports transactions: ' + metadata.supportsTransactions());
}
// Code Example 6.13
/**
* Return a ResultSet
*
* @param {JdbcConnection} conn
* @param {number} deptno
* @return {JdbcResultSet}
*/
function getResSetForDept(conn, deptno) {
var sql = ('SELECT\n' +
' e.ename,\n' +
' e.hiredate,\n' +
' e.job,\n' +
' e.sal,\n' +
' d.dname\n' +
'FROM\n' +
' emp e\n' +
' JOIN dept d ON e.deptno = d.deptno\n' +
'WHERE\n' +
' d.deptno = ?'),
pStmt = conn.prepareStatement(sql),
rs;
pStmt.setInt(1, deptno);
recset = pStmt.executeQuery();
return recset;
}
// code Example 6.14
/**
* Return the column names for
* given ResultSet
* @param {JdbcResultSet} rs
* @return {String[]}
*/
function getColNames(rs) {
var md = rs.getMetaData(),
colCount = md.getColumnCount(),
colNames = [],
colName,
i;
for(i = 1; i <= colCount; i +=1) {
colName = md.getColumnName(i);
colNames.push(colName);
}
return colNames;
}
// code Example 6.15
/**
* Return the data rows as an array-of-arrays
* for the given ResultSet
* @param {JdbcResultSet} rs
* @return {String[]}
*/
function getDataRows(rs) {
var md = rs.getMetaData(),
colCount = md.getColumnCount(),
row = [],
value,
dataRows = [],
colName,
i;
while(rs.next()) {
row = [];
for(i = 1; i <= colCount; i +=1) {
value = rs.getString(i);
row.push(value);
}
dataRows.push(row);
}
return dataRows;
}
// code Example 6.16
/**
* Check if given sheet name
* exists in the active spreadsheet.
* @param {String} sheetName
* @return {boolean}
*/
function sheetExists(sheetName) {
var ss = SpreadsheetApp.getActiveSpreadsheet(),
sheets = ss.getSheets(),
i;
for(i = 0; i < sheets.length; i += 1) {
if( sheets[i].getSheetName() == sheetName) {
return true;
}
}
return false;
}
// Code Example 6.17
/**
* Delete sheet with given name
* and replace it with new one
* with same name.
* @param {String} sheetName
* @return {Sheet}
*/
function replaceOldSheet(sheetName) {
var ss = SpreadsheetApp.getActiveSpreadsheet(),
sh = ss.getSheetByName(sheetName);
ss.deleteSheet(sh);
sh = ss.insertSheet(sheetName);
return sh
}
// Code Example 6.18
/**
* Create a sheet with the given name
* in the active spreadsheet
* @param {String} sheetName
* @return {Sheet}
*/
function addNewSheet(sheetName) {
var ss = SpreadsheetApp.getActiveSpreadsheet(),
sh = ss.insertSheet(sheetName);
return sh;
}
// Code Example 6.19
/**
* Run application to extract a set of
* rows from the database and write them
* to a new sheet.
* @return {undefined}
*/
function main() {
var conn = getConnectionToMyDB(),
deptno = 20,
rs = getResSetForDept(conn, deptno),
colNames = getColNames(rs),
dataRows = getDataRows(rs),
sheetName = 'RESEARCH',
sh,
dataRowCount = dataRows.length,
dataColCount = colNames.length,
outputHeaderRng,
outputDataRng;
if(sheetExists(sheetName)) {
sh = replaceOldSheet(sheetName)
} else {
sh = addNewSheet(sheetName);
}
outputHeaderRng = sh.getRange(1,1,1,dataColCount);
outputHeaderRng.setFontWeight('bold');
outputDataRng = sh.getRange(2,
1,
dataRowCount,
dataColCount);
outputHeaderRng.setValues([colNames]);
outputDataRng.setValues(dataRows);
rs.close();
conn.close();
}