Package org.jivesoftware.database

Class 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

    • 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)