3
# Check if the two given tables (possibly residing on different
4
# master/slave servers) are equal.
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# The tables to check are given by the test language variables
9
# $diff_table_1 and $diff_table_2. They must be of the
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# [master:|slave:]database.table
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# I.e., both database and table must be speicified. Optionally, you
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# can prefix the name with 'master:' (to read the table on master) or
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# with 'slave:' (to read the table on slave). If no prefix is given,
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# reads the table from the current connection. If one of these
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# variables has a prefix, both should have a prefix.
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# ==== Side effects ====
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# - Prints "Comparing tables $diff_table_1 and $diff_tables_2".
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# - If the tables are different, prints the difference in a
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# system-specific format (unified diff if supported) and generates
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# - If $diff_table_1 or $diff_table_2 begins with 'master:' or
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# 'slave:', it will stay connected to one of those hosts after
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# execution. The host is only guaranteed to remain unchanged if
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# none of $diff_table_1 or $diff_table_2 begins with 'master:' or
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# - It is currently not possible to use this for tables that are
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# supposed to be different, because if the files are different:
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# - 'diff' produces system-dependent output,
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# - the output includes the absolute path of the compared files,
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# - the output includes a timestamp.
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# To fix that, we'd probably have to use SQL to compute the
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# symmetric difference between the tables. I'm not sure how to do
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# that efficiently. If we implement this, it would be nice to
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# compare the table definitions too.
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# - It actually compares the result of "SELECT * FROM table ORDER BY
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# col1, col2, ..., colN INTO OUTFILE 'file'". Hence, it is assumed
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# that the comparison orders for both tables are equal and that two
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# rows that are equal in the comparison order cannot differ, e.g.,
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# ==== Save both tables to file ====
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--echo Comparing tables $diff_table_1 and $diff_table_2
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--remove_file $MYSQLTEST_VARDIR/tmp/diff_table_1
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--remove_file $MYSQLTEST_VARDIR/tmp/diff_table_2
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let $_diff_table=$diff_table_2;
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# Parse out any leading "master:" or "slave:" from the table
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# specification and connect the appropriate server.
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let $_diff_conn_master=`SELECT SUBSTR('$_diff_table', 1, 7) = 'master:'`;
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if ($_diff_conn_master) {
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let $_diff_table=`SELECT SUBSTR('$_diff_table', 8)`;
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let $_diff_conn_slave=`SELECT SUBSTR('$_diff_table', 1, 6) = 'slave:'`;
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if ($_diff_conn_slave) {
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let $_diff_table=`SELECT SUBSTR('$_diff_table', 7)`;
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# Sanity-check the input.
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let $_diff_error= `SELECT '$_diff_table' NOT LIKE '_%._%'`;
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--echo !!!ERROR IN TEST: \$diff_table_$_diff_i='$_diff_table' is not in the form database.table
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# We need the output files to be sorted (so that diff_files does not
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# think the files are different just because they are differently
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# ordered). To this end, we first generate a query that sorts the
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# table by all columns. Since ORDER BY accept column indices, we
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# just generate a comma-separated list of all numbers from 1 to the
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# number of columns in the table.
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let $_diff_column_index=`SELECT MAX(ordinal_position)
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FROM information_schema.columns
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WHERE CONCAT(table_schema, '.', table_name) =
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let $_diff_column_list=$_diff_column_index;
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dec $_diff_column_index;
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while ($_diff_column_index) {
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let $_diff_column_list=$_diff_column_index, $_diff_column_list;
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dec $_diff_column_index;
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# Now that we have the comma-separated list of columns, we can write
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# the table to a file.
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eval SELECT * FROM $_diff_table ORDER BY $_diff_column_list
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INTO OUTFILE '$MYSQLTEST_VARDIR/tmp/diff_table_$_diff_i';
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# Do the same for $diff_table_1.
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let $_diff_table=$diff_table_1;
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# ==== Compare the generated files ====
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diff_files $MYSQLTEST_VARDIR/tmp/diff_table_1 $MYSQLTEST_VARDIR/tmp/diff_table_2;
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--remove_file $MYSQLTEST_VARDIR/tmp/diff_table_1
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--remove_file $MYSQLTEST_VARDIR/tmp/diff_table_2