/**
* Creates a connection pool (2 connections) and execututes queries on each. It then tries to get
* a third connection.
*/
public static void testConnectionPooling() {
ConnectionPool conPool = new ConnectionPool(2, driverName, connURL, username, password);
conPool.resizeConnectionPool(3);
String out = "";
try {
SQLExecutor sqlExec1 = new SQLExecutor(conPool);
SQLResults res1 = sqlExec1.runQuery("select dd * from JDBC_TEST where CODE < 'E'");
res1.setToStringFormatWidth(11);
out += res1.toString() + "\n\n";
SQLExecutor sqlExec2 = new SQLExecutor(conPool);
SQLResults res2 = sqlExec2.runQuery("select * from JDBC_TEST where CODE > 'E'");
out += res2.toString() + "\n\n";
// try to get a third connection via getConnection(). there are no available
// connections so the ConnectionPool will create a new connection, add it the
// pool, and return the new connection
SQLExecutor sqlExec3 = new SQLExecutor(conPool);
SQLResults res3 = sqlExec2.runQuery("select * from JDBC_TEST where CODE > 'E'");
out += res3.toString();
} finally {
conPool.closeAllConnections();
}
System.out.println(out);
}
/**
* static method testing jdbc framework with multiple updates and intentional sql exceptions that
* are trapped in appropriate exception handling blocks
*/
public static void testMultipleUpdatesAndTransWithException() {
ConnectionPool conPool = getConnectionPool();
SQLExecutor sqlExec = new SQLExecutor(conPool);
try {
sqlExec.setAutoCommit(false);
sqlExec.addParam(new Integer(7));
sqlExec.runQuery("UPDATE JDBC_TEST SET CODE = 'Z' WHERE TEST_ID = ?");
sqlExec.addParam(new Integer(6));
// integrity constraint violation
sqlExec.runQuery("UPDATE JDBC_TEST SET TEST_ID = NULL WHERE TEST_ID = ?");
sqlExec.commitTrans();
System.out.println("transaction committed");
} catch (DatabaseException e) {
System.out.println("Error code=" + e.getSQLErrorCode() + ", SQLState=" + e.getSQLState());
if (e.isDataIntegrityViolation()) System.out.println("data integrity violation");
else if (e.isBadSQLGrammar()) System.out.println("bad SQL grammar");
else if (e.isNonExistentTableOrViewOrCol()) System.out.println("Non existent table or view");
System.out.println(e.getMessage());
sqlExec.rollbackTrans();
System.out.println("transaction rolled back");
} finally {
sqlExec.closeConnection();
}
}
/**
* Run a parameterized query (sql) once with one parameter and then again with another parameter.
* Since the sql doesn't change from the first call to runQuery() to the second call, the
* runQuery() method only prepares the SQL statement once (the first time it is called). This was
* verified with the debugger.
*/
public static void testParameterizedQuery() {
String sql = "SELECT SURROGATE_ID, CLASS_CD FROM INV WHERE SURROGATE_ID = ?";
SQLExecutor sqlExec = new SQLExecutor(getConnectionPool());
sqlExec.addParam(840874);
SQLResults res = sqlExec.runQuery(sql);
System.out.println(res.toString());
sqlExec.addParam(925659);
res = sqlExec.runQuery(sql);
System.out.println("\n" + res.toString());
}
/** static method testing jdbc framework with multiple updates, using transaction management */
public static void testMultipleUpdatesAndTrans() {
ConnectionPool conPool = getConnectionPool();
SQLExecutor sqlExec = new SQLExecutor(conPool);
try {
sqlExec.setAutoCommit(false);
sqlExec.addParam(new Integer(7));
sqlExec.runQuery("UPDATE JDBC_TEST SET CODE = 'Q' WHERE TEST_ID = ?");
sqlExec.addParam(new Integer(6));
sqlExec.runQuery("UPDATE JDBC_TEST SET CODE = 'R' WHERE TEST_ID = ?");
sqlExec.rollbackTrans();
System.out.println("transaction rolled back");
} finally {
sqlExec.closeConnection();
}
}
/**
* static method testing jdbc framework with a select for update statement (that locks a record)
* and an update statement that generates a deadlock.
*/
public static void testDeadlockException() {
ConnectionPool conPool = getConnectionPool();
SQLExecutor sqlExec1 = new SQLExecutor(conPool);
try {
// lock record with a select for update statement
sqlExec1.setAutoCommit(false);
sqlExec1.addParam(new Integer(2));
sqlExec1.runQuery("SELECT CODE FROM JDBC_TEST WHERE TEST_ID = ? FOR UPDATE");
System.out.println("Attempting to update a record locked by another connection...");
SQLExecutor sqlExec2 = new SQLExecutor(getConnectionPool());
sqlExec2.setTimeoutInSec(5); // timeout if deadlocked
sqlExec2.addParam(new Integer(2));
sqlExec2.runQueryCloseCon("UPDATE JDBC_TEST SET CODE = 'X' WHERE TEST_ID = ?");
} catch (DatabaseException e) {
System.out.println("Error code=" + e.getSQLErrorCode() + ", " + e.getMessage());
if (e.isRowlockOrTimedOut()) System.out.println("Rowlock exception!");
} finally {
conPool.closeAllConnections();
}
}