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Testing MySQL Table Metadata Cache Implementation in Canal

This test suite evaluates the Table Metadata Cache functionality in Canal’s MySQL parsing module. It validates the connection handling and table metadata retrieval capabilities essential for Canal’s database synchronization features.

Test Coverage Overview

The test suite focuses on validating MySQL table metadata caching mechanisms.

Tests MySQL connection establishment and error handling
Verifies DDL query execution and result parsing
Includes table metadata retrieval validation
Covers connection parameter handling and socket address configuration

Implementation Analysis

The testing approach employs JUnit framework with direct MySQL connectivity testing.

Implements connection setup validation and DDL query execution patterns, utilizing MysqlConnection class for database interactions and ResultSetPacket for query result handling.

Uses Assert statements for validation
Implements try-catch blocks for error handling
Utilizes packet-level result processing

Technical Details

JUnit testing framework
MySQL connection driver
Local MySQL instance (127.0.0.1:3306)
Custom ResultSetPacket handling
TableMetaCache implementation
DDL query execution

Best Practices Demonstrated

The test implementation showcases robust database testing practices with proper resource handling and error validation.

Proper connection management
Structured error handling
Clear test case organization
Isolated test environment setup
Comprehensive assertion usage

alibaba/canal

parse/src/test/java/com/alibaba/otter/canal/parse/inbound/TableMetaCacheTest.java

            
package com.alibaba.otter.canal.parse.inbound;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;

import org.junit.Assert;
import org.junit.Ignore;
import org.junit.Test;

import com.alibaba.otter.canal.parse.driver.mysql.packets.server.ResultSetPacket;
import com.alibaba.otter.canal.parse.inbound.mysql.MysqlConnection;
@Ignore
public class TableMetaCacheTest {

    @Test
    public void testSimple() throws IOException {
        MysqlConnection connection = new MysqlConnection(new InetSocketAddress("127.0.0.1", 3306), "root", "hello");
        try {
            connection.connect();
        } catch (IOException e) {
            Assert.fail(e.getMessage());
        }

        List<ResultSetPacket> packets = connection.queryMulti("show create table test.ljh_test");
        String createDDL = null;
        if (packets.get(0).getFieldValues().size() > 0) {
            createDDL = packets.get(0).getFieldValues().get(1);
        }

        System.out.println(createDDL);

        // TableMetaCache cache = new TableMetaCache(connection);
        // TableMeta meta = cache.getTableMeta("otter1", "otter_stability1");
        // Assert.assertNotNull(meta);
        // for (FieldMeta field : meta.getFields()) {
        // System.out.println("filed :" + field.getColumnName() + " , isKey : "
        // + field.isKey() + " , isNull : "
        // + field.isNullable());
        // }
    }
}