Example usage for android.database.sqlite SQLiteTransactionListener onBegin

Introduction

In this page you can find the example usage for android.database.sqlite SQLiteTransactionListener onBegin.

Prototype

void onBegin();

Source Link

Document

Called immediately after the transaction begins.

Usage

From source file:io.requery.android.database.sqlite.SQLiteSession.java

private void beginTransactionUnchecked(int transactionMode, SQLiteTransactionListener transactionListener,
        int connectionFlags, CancellationSignal cancellationSignal) {
    if (cancellationSignal != null) {
        cancellationSignal.throwIfCanceled();
    }/*from www  .  ja v  a2 s .  c  o m*/

    if (mTransactionStack == null) {
        acquireConnection(null, connectionFlags, cancellationSignal); // might throw
    }
    try {
        // Set up the transaction such that we can back out safely
        // in case we fail part way.
        if (mTransactionStack == null) {
            // Execute SQL might throw a runtime exception.
            switch (transactionMode) {
            case TRANSACTION_MODE_IMMEDIATE:
                mConnection.execute("BEGIN IMMEDIATE;", null, cancellationSignal); // might throw
                break;
            case TRANSACTION_MODE_EXCLUSIVE:
                mConnection.execute("BEGIN EXCLUSIVE;", null, cancellationSignal); // might throw
                break;
            default:
                mConnection.execute("BEGIN;", null, cancellationSignal); // might throw
                break;
            }
        }

        // Listener might throw a runtime exception.
        if (transactionListener != null) {
            try {
                transactionListener.onBegin(); // might throw
            } catch (RuntimeException ex) {
                if (mTransactionStack == null) {
                    mConnection.execute("ROLLBACK;", null, cancellationSignal); // might throw
                }
                throw ex;
            }
        }

        // Bookkeeping can't throw, except an OOM, which is just too bad...
        Transaction transaction = obtainTransaction(transactionMode, transactionListener);
        transaction.mParent = mTransactionStack;
        mTransactionStack = transaction;
    } finally {
        if (mTransactionStack == null) {
            releaseConnection(); // might throw
        }
    }
}

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