DbConnectionManager (Core XMPP Server 4.4.0-beta API)

java.lang.Object
- org.jivesoftware.database.DbConnectionManager

```
public class DbConnectionManager
extends Object
```
Central manager of database connections. All methods are static so that they can be easily accessed throughout the classes in the database package.
This class also provides a set of utility methods that abstract out operations that may not work on all databases such as setting the max number or rows that a query should return.

Author:

Jive Software

See Also:

ConnectionProvider

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class DbConnectionManager.DatabaseType
A class that identifies the type of the database that Jive is connected to.

Nested Classes
Modifier and Type	Class and Description
`static class`	`DbConnectionManager.DatabaseType` A class that identifies the type of the database that Jive is connected to.

Constructor Summary

Constructors
Constructor and Description

DbConnectionManager()

Constructors
Constructor and Description
`DbConnectionManager()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`closeConnection(Connection con)` Closes a database connection (returning the connection to the connection pool).
`static void`	`closeConnection(ResultSet rs, Statement stmt, Connection con)` Closes a result set, statement and database connection (returning the connection to the connection pool).
`static void`	`closeConnection(Statement stmt, Connection con)` Closes a statement and database connection (returning the connection to the connection pool).
`static void`	`closeResultSet(ResultSet rs)` Closes a result set.
`static void`	`closeStatement(ResultSet rs, Statement stmt)` Closes a statement and a result set.
`static void`	`closeStatement(Statement stmt)` Closes a statement.
`static void`	`closeTransactionConnection(Connection con, boolean abortTransaction)` Closes a Connection.
`static void`	`closeTransactionConnection(PreparedStatement pstmt, Connection con, boolean abortTransaction)` Closes a PreparedStatement and Connection.
`static PreparedStatement`	`createScrollablePreparedStatement(Connection con, String sql)` Creates a scroll insensitive PreparedStatement if the JDBC driver supports it, or a normal PreparedStatement otherwise.
`static void`	`destroyConnectionProvider()` Destroys the currennt connection provider.
`static void`	`fastcloseStmt(PreparedStatement pstmt)` Closes a statement.
`static void`	`fastcloseStmt(ResultSet rs, PreparedStatement pstmt)` Closes a statement and a result set.
`static Connection`	`getConnection()` Returns a database connection from the currently active connection provider.
`static ConnectionProvider`	`getConnectionProvider()` Returns the current connection provider.
`static DbConnectionManager.DatabaseType`	`getDatabaseType()` Returns the database type.
`static String`	`getIdentifierQuoteString()`
`static String`	`getLargeTextField(ResultSet rs, int columnIndex)` Retrives a large text column from a result set, automatically performing streaming if the JDBC driver requires it.
`static SchemaManager`	`getSchemaManager()` Returns a SchemaManager instance, which can be used to manage the database schema information for Openfire and plugins.
`static String`	`getTestSQL(String driver)`
`static Connection`	`getTransactionConnection()` Returns a Connection from the currently active connection provider that is ready to participate in transactions (auto commit is set to false).
`static boolean`	`isBatchUpdatesSupported()`
`static boolean`	`isEmbeddedDB()`
`static boolean`	`isFetchSizeSupported()`
`static boolean`	`isMaxRowsSupported()`
`static boolean`	`isProfilingEnabled()` Returns true if connection profiling is turned on.
`static boolean`	`isPstmtFetchSizeSupported()`
`static boolean`	`isScrollResultsSupported()`
`static boolean`	`isStreamTextRequired()`
`static boolean`	`isSubqueriesSupported()`
`static boolean`	`isTransactionsSupported()`
`static void`	`limitRowsAndFetchSize(PreparedStatement pstmt, int startIndex, int numResults)` Limits the number of the results in a result set (to startIndex + numResults).
`static void`	`scrollResultSet(ResultSet rs, int rowNumber)` Scrolls forward in a result set the specified number of rows.
`static void`	`setConnectionProvider(ConnectionProvider provider)` Sets the connection provider.
`static void`	`setFetchSize(PreparedStatement pstmt, int fetchSize)` Sets the number of rows that the JDBC driver should buffer at a time.
`static void`	`setFetchSize(ResultSet rs, int fetchSize)` Sets the number of rows that the JDBC driver should buffer at a time.
`static void`	`setLargeTextField(PreparedStatement pstmt, int parameterIndex, String value)` Sets a large text column in a result set, automatically performing streaming if the JDBC driver requires it.
`static void`	`setMaxRows(Statement stmt, int maxRows)` Sets the max number of rows that should be returned from executing a statement.
`static void`	`setProfilingEnabled(boolean enable)` Turns connection profiling on or off.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DbConnectionManager
```
public DbConnectionManager()
```
- Method Detail
  - getConnection
```
public static Connection getConnection()
                                throws SQLException
```
    Returns a database connection from the currently active connection provider. An exception will be thrown if no connection was found. (auto commit is set to true).
    
    Returns:
    
    a connection.
    
    Throws:
    
    SQLException - if a SQL exception occurs or no connection was found.
  - getTransactionConnection
```
public static Connection getTransactionConnection()
                                           throws SQLException
```
    Returns a Connection from the currently active connection provider that is ready to participate in transactions (auto commit is set to false).
    
    Returns:
    
    a connection with transactions enabled.
    
    Throws:
    
    SQLException - if a SQL exception occurs.
  - closeTransactionConnection
```
public static void closeTransactionConnection(PreparedStatement pstmt,
                                              Connection con,
                                              boolean abortTransaction)
```
    Closes a PreparedStatement and Connection. However, it first rolls back the transaction or commits it depending on the value of abortTransaction.
    
    Parameters:
    
    pstmt - the prepared statement to close.
    
    con - the connection to close.
    
    abortTransaction - true if the transaction should be rolled back.
  - closeTransactionConnection
```
public static void closeTransactionConnection(Connection con,
                                              boolean abortTransaction)
```
    Closes a Connection. However, it first rolls back the transaction or commits it depending on the value of abortTransaction.
    
    Parameters:
    
    con - the connection to close.
    
    abortTransaction - true if the transaction should be rolled back.
  - closeResultSet
```
public static void closeResultSet(ResultSet rs)
```
    Closes a result set. This method should be called within the finally section of your database logic, as in the following example:
```
  public void doSomething(Connection con) {
      ResultSet rs = null;
      PreparedStatement pstmt = null;
      try {
          pstmt = con.prepareStatement("select * from blah");
          rs = pstmt.executeQuery();
          ....
      }
      catch (SQLException sqle) {
          Log.error(sqle.getMessage(), sqle);
      }
      finally {
          ConnectionManager.closeResultSet(rs);
          ConnectionManager.closePreparedStatement(pstmt);
      }
 } 
```
    Parameters:
    
    rs - the result set to close.
  - closeStatement
```
public static void closeStatement(Statement stmt)
```
    Closes a statement. This method should be called within the finally section of your database logic, as in the following example:
```
  public void doSomething(Connection con) {
      PreparedStatement pstmt = null;
      try {
          pstmt = con.prepareStatement("select * from blah");
          ....
      }
      catch (SQLException sqle) {
          Log.error(sqle.getMessage(), sqle);
      }
      finally {
          ConnectionManager.closeStatement(pstmt);
      }
 } 
```
    Parameters:
    
    stmt - the statement.
  - closeStatement
```
public static void closeStatement(ResultSet rs,
                                  Statement stmt)
```
    Closes a statement and a result set. This method should be called within the finally section of your database logic, as in the following example:
```
  public void doSomething(Connection con) {
      PreparedStatement pstmt = null;
      ResultSet rs = null;
      try {
          pstmt = con.prepareStatement("select * from blah");
          rs = ...
          ....
      }
      catch (SQLException sqle) {
          Log.error(sqle.getMessage(), sqle);
      }
      finally {
          ConnectionManager.closeStatement(rs, pstmt);
      }
 } 
```
    Parameters:
    
    rs - the result set to close
    
    stmt - the statement.
  - fastcloseStmt
```
public static void fastcloseStmt(PreparedStatement pstmt)
                          throws SQLException
```
    Closes a statement. This method should be called within the try section of your database logic when you reuse a statement. It may throws an exception, so don't place it in the finally section.
    Example:
```
  public void doSomething(Connection con) {
      PreparedStatement pstmt = null;
      try {
          pstmt = con.prepareStatement("select * from dual");
          pstmt.executeUpdate();
          ...
          ConnectionManager.fastcloseStmt(pstmt);
          pstmt = con.prepareStatement("select * from blah");
          ...
      }
      ...
 } 
```
    Parameters:
    
    pstmt - the statement to close.
    
    Throws:
    
    SQLException - if an exception occurs closing the statement
  - fastcloseStmt
```
public static void fastcloseStmt(ResultSet rs,
                                 PreparedStatement pstmt)
                          throws SQLException
```
    Closes a statement and a result set. This method should be called within the try section of your database logic when you reuse a statement. It may throw an exception, so don't place it in the finally section.
    Example:
```
  public void doSomething(Connection con) {
      PreparedStatement pstmt = null;
      try {
          pstmt = con.prepareStatement("select * from blah");
          rs = pstmt.executeQuery();
          ...
          ConnectionManager.fastcloseStmt(rs, pstmt);
          pstmt = con.prepareStatement("select * from blah");
          ...
      }
      ...
 } 
```
    Parameters:
    
    rs - The result set to close
    
    pstmt - the statement to close.
    
    Throws:
    
    SQLException - if an exception occurs closing the result set or statement
  - closeConnection
```
public static void closeConnection(ResultSet rs,
                                   Statement stmt,
                                   Connection con)
```
    Closes a result set, statement and database connection (returning the connection to the connection pool). This method should be called within the finally section of your database logic, as in the following example:
```
 Connection con = null;
 PrepatedStatment pstmt = null;
 ResultSet rs = null;
 try {
     con = ConnectionManager.getConnection();
     pstmt = con.prepareStatement("select * from blah");
     rs = psmt.executeQuery();
     ....
 }
 catch (SQLException sqle) {
     Log.error(sqle.getMessage(), sqle);
 }
 finally {
     ConnectionManager.closeConnection(rs, pstmt, con);
 }
```
    Parameters:
    
    rs - the result set.
    
    stmt - the statement.
    
    con - the connection.
  - closeConnection
```
public static void closeConnection(Statement stmt,
                                   Connection con)
```
    Closes a statement and database connection (returning the connection to the connection pool). This method should be called within the finally section of your database logic, as in the following example:
```
 Connection con = null;
 PrepatedStatment pstmt = null;
 try {
     con = ConnectionManager.getConnection();
     pstmt = con.prepareStatement("select * from blah");
     ....
 }
 catch (SQLException sqle) {
     Log.error(sqle.getMessage(), sqle);
 }
 finally {
     DbConnectionManager.closeConnection(pstmt, con);
 }
```
    Parameters:
    
    stmt - the statement.
    
    con - the connection.
  - closeConnection
```
public static void closeConnection(Connection con)
```
    Closes a database connection (returning the connection to the connection pool). Any statements associated with the connection should be closed before calling this method. This method should be called within the finally section of your database logic, as in the following example:
```
 Connection con = null;
 try {
     con = ConnectionManager.getConnection();
     ....
 }
 catch (SQLException sqle) {
     Log.error(sqle.getMessage(), sqle);
 }
 finally {
     DbConnectionManager.closeConnection(con);
 }
```
    Parameters:
    
    con - the connection.
  - createScrollablePreparedStatement
```
public static PreparedStatement createScrollablePreparedStatement(Connection con,
                                                                  String sql)
                                                           throws SQLException
```
    Creates a scroll insensitive PreparedStatement if the JDBC driver supports it, or a normal PreparedStatement otherwise.
    
    Parameters:
    
    con - the database connection.
    
    sql - the SQL to create the PreparedStatement with.
    
    Returns:
    
    a PreparedStatement
    
    Throws:
    
    SQLException - if an error occurs.
  - scrollResultSet
```
public static void scrollResultSet(ResultSet rs,
                                   int rowNumber)
                            throws SQLException
```
    Scrolls forward in a result set the specified number of rows. If the JDBC driver supports the feature, the cursor will be moved directly. Otherwise, we scroll through results one by one manually by calling rs.next().
    
    Parameters:
    
    rs - the ResultSet object to scroll.
    
    rowNumber - the row number to scroll forward to.
    
    Throws:
    
    SQLException - if an error occurs.
  - limitRowsAndFetchSize
```
public static void limitRowsAndFetchSize(PreparedStatement pstmt,
                                         int startIndex,
                                         int numResults)
```
    Limits the number of the results in a result set (to startIndex + numResults). Sets the fetch size depending on the features of the JDBC driver and make sure that the size is not bigger than 500.
    
    Parameters:
    
    pstmt - the PreparedStatement
    
    startIndex - the first row with interesting data
    
    numResults - the number of interesting results
  - setFetchSize
```
public static void setFetchSize(PreparedStatement pstmt,
                                int fetchSize)
```
    Sets the number of rows that the JDBC driver should buffer at a time. The operation is automatically bypassed if Openfire knows that the the JDBC driver or database doesn't support it.
    
    Parameters:
    
    pstmt - the PreparedStatement to set the fetch size for.
    
    fetchSize - the fetchSize.
  - getConnectionProvider
```
public static ConnectionProvider getConnectionProvider()
```
    Returns the current connection provider. The only case in which this method should be called is if more information about the current connection provider is needed. Database connections should always be obtained by calling the getConnection method of this class.
    
    Returns:
    
    the connection provider.
  - setConnectionProvider
```
public static void setConnectionProvider(ConnectionProvider provider)
```
    Sets the connection provider. The old provider (if it exists) is shut down before the new one is started. A connection provider should not be started before being passed to the connection manager because the manager will call the start() method automatically.
    
    Parameters:
    
    provider - the ConnectionProvider that the manager should obtain connections from.
  - destroyConnectionProvider
```
public static void destroyConnectionProvider()
```
    Destroys the currennt connection provider. Future calls to getConnectionProvider() will return null until a new ConnectionProvider is set, or one is automatically loaded by a call to getConnection().
  - getLargeTextField
```
public static String getLargeTextField(ResultSet rs,
                                       int columnIndex)
                                throws SQLException
```
    Retrives a large text column from a result set, automatically performing streaming if the JDBC driver requires it. This is necessary because different JDBC drivers have different capabilities and methods for retrieving large text values.
    
    Parameters:
    
    rs - the ResultSet to retrieve the text field from.
    
    columnIndex - the column in the ResultSet of the text field.
    
    Returns:
    
    the String value of the text field.
    
    Throws:
    
    SQLException - if an SQL exception occurs.
  - setLargeTextField
```
public static void setLargeTextField(PreparedStatement pstmt,
                                     int parameterIndex,
                                     String value)
                              throws SQLException
```
    Sets a large text column in a result set, automatically performing streaming if the JDBC driver requires it. This is necessary because different JDBC drivers have different capabilities and methods for setting large text values.
    
    Parameters:
    
    pstmt - the PreparedStatement to set the text field in.
    
    parameterIndex - the index corresponding to the text field.
    
    value - the String to set.
    
    Throws:
    
    SQLException - if an SQL exception occurs.
  - setMaxRows
```
public static void setMaxRows(Statement stmt,
                              int maxRows)
```
    Sets the max number of rows that should be returned from executing a statement. The operation is automatically bypassed if Jive knows that the the JDBC driver or database doesn't support it.
    
    Parameters:
    
    stmt - the Statement to set the max number of rows for.
    
    maxRows - the max number of rows to return.
  - setFetchSize
```
public static void setFetchSize(ResultSet rs,
                                int fetchSize)
```
    Sets the number of rows that the JDBC driver should buffer at a time. The operation is automatically bypassed if Jive knows that the the JDBC driver or database doesn't support it.
    
    Parameters:
    
    rs - the ResultSet to set the fetch size for.
    
    fetchSize - the fetchSize.
  - getSchemaManager
```
public static SchemaManager getSchemaManager()
```
    Returns a SchemaManager instance, which can be used to manage the database schema information for Openfire and plugins.
    
    Returns:
    
    a SchemaManager instance.
  - getDatabaseType
```
public static DbConnectionManager.DatabaseType getDatabaseType()
```
    Returns the database type. The possible types are constants of the DatabaseType class. Any database that doesn't have its own constant falls into the "Other" category.
    
    Returns:
    
    the database type.
  - isProfilingEnabled
```
public static boolean isProfilingEnabled()
```
    Returns true if connection profiling is turned on. You can collect profiling statistics by using the static methods of the ProfiledConnection class.
    
    Returns:
    
    true if connection profiling is enabled.
  - setProfilingEnabled
```
public static void setProfilingEnabled(boolean enable)
```
    Turns connection profiling on or off. You can collect profiling statistics by using the static methods of the ProfiledConnection class.
    
    Parameters:
    
    enable - true to enable profiling; false to disable.
  - isTransactionsSupported
```
public static boolean isTransactionsSupported()
```
  - isStreamTextRequired
```
public static boolean isStreamTextRequired()
```
  - isMaxRowsSupported
```
public static boolean isMaxRowsSupported()
```
  - isFetchSizeSupported
```
public static boolean isFetchSizeSupported()
```
  - isPstmtFetchSizeSupported
```
public static boolean isPstmtFetchSizeSupported()
```
  - isSubqueriesSupported
```
public static boolean isSubqueriesSupported()
```
  - isScrollResultsSupported
```
public static boolean isScrollResultsSupported()
```
  - isBatchUpdatesSupported
```
public static boolean isBatchUpdatesSupported()
```
  - isEmbeddedDB
```
public static boolean isEmbeddedDB()
```
  - getIdentifierQuoteString
```
public static String getIdentifierQuoteString()
```
  - getTestSQL
```
public static String getTestSQL(String driver)
```

Class DbConnectionManager

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DbConnectionManager

Method Detail

getConnection

getTransactionConnection

closeTransactionConnection

closeTransactionConnection

closeResultSet

closeStatement

closeStatement

fastcloseStmt

fastcloseStmt

closeConnection

closeConnection

closeConnection

createScrollablePreparedStatement

scrollResultSet

limitRowsAndFetchSize

setFetchSize

getConnectionProvider

setConnectionProvider

destroyConnectionProvider

getLargeTextField

setLargeTextField

setMaxRows

setFetchSize

getSchemaManager

getDatabaseType

isProfilingEnabled

setProfilingEnabled

isTransactionsSupported

isStreamTextRequired

isMaxRowsSupported

isFetchSizeSupported

isPstmtFetchSizeSupported

isSubqueriesSupported

isScrollResultsSupported

isBatchUpdatesSupported

isEmbeddedDB

getIdentifierQuoteString

getTestSQL