flyway实战

本文主要是介绍flyway实战，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

flyway是一款用来管理数据库版本的工具框架

一, 添加依赖

<dependency><groupId>org.flywaydb</groupId><artifactId>flyway-core</artifactId>
</dependency>
<dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId>
</dependency>

二, 编写配置类

MySQLDatabase

/** Copyright (C) Red Gate Software Ltd 2010-2021** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**         http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package org.flywaydb.core.internal.database.mysql;import lombok.CustomLog;
import lombok.extern.slf4j.Slf4j;
import org.flywaydb.core.api.FlywayException;
import org.flywaydb.core.api.MigrationType;
import org.flywaydb.core.api.MigrationVersion;
import org.flywaydb.core.api.configuration.Configuration;
import org.flywaydb.core.internal.database.base.Database;
import org.flywaydb.core.internal.database.base.BaseDatabaseType;
import org.flywaydb.core.internal.database.base.Table;
import org.flywaydb.core.internal.database.mysql.mariadb.MariaDBDatabaseType;
import org.flywaydb.core.internal.jdbc.JdbcConnectionFactory;
import org.flywaydb.core.internal.jdbc.JdbcTemplate;
import org.flywaydb.core.internal.jdbc.StatementInterceptor;import java.sql.Connection;
import java.sql.SQLException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;@Slf4j
public class MySQLDatabase extends Database<MySQLConnection> {// See https://mariadb.com/kb/en/version/private static final Pattern MARIADB_VERSION_PATTERN = Pattern.compile("(\\d+\\.\\d+)\\.\\d+(-\\d+)*-MariaDB(-\\w+)*");private static final Pattern MARIADB_WITH_MAXSCALE_VERSION_PATTERN = Pattern.compile("(\\d+\\.\\d+)\\.\\d+(-\\d+)* (\\d+\\.\\d+)\\.\\d+(-\\d+)*-maxscale(-\\w+)*");private static final Pattern MYSQL_VERSION_PATTERN = Pattern.compile("(\\d+\\.\\d+)\\.\\d+\\w*");/*** Whether this is a Percona XtraDB Cluster in strict mode.*/private final boolean pxcStrict;/*** Whether this database is enforcing GTID consistency.*/private final boolean gtidConsistencyEnforced;/*** Whether the event scheduler table is queryable.*/final boolean eventSchedulerQueryable;public MySQLDatabase(Configuration configuration, JdbcConnectionFactory jdbcConnectionFactory, StatementInterceptor statementInterceptor) {super(configuration, jdbcConnectionFactory, statementInterceptor);JdbcTemplate jdbcTemplate = new JdbcTemplate(rawMainJdbcConnection, databaseType);pxcStrict = isMySQL() && isRunningInPerconaXtraDBClusterWithStrictMode(jdbcTemplate);gtidConsistencyEnforced = isMySQL() && isRunningInGTIDConsistencyMode(jdbcTemplate);eventSchedulerQueryable = false;}private static boolean isEventSchedulerQueryable(JdbcTemplate jdbcTemplate) {try {// Attempt queryjdbcTemplate.queryForString("SELECT event_name FROM information_schema.events LIMIT 1");return true;} catch (SQLException e) {log.debug("Detected unqueryable MariaDB event scheduler, most likely due to it being OFF or DISABLED.");return false;}}static boolean isRunningInPerconaXtraDBClusterWithStrictMode(JdbcTemplate jdbcTemplate) {try {String pcx_strict_mode = jdbcTemplate.queryForString("select VARIABLE_VALUE from performance_schema.global_variables"+ " where variable_name = 'pxc_strict_mode'");if ("ENFORCING".equals(pcx_strict_mode) || "MASTER".equals(pcx_strict_mode)) {log.debug("Detected Percona XtraDB Cluster in strict mode");return true;}} catch (SQLException e) {log.debug("Unable to detect whether we are running in a Percona XtraDB Cluster. Assuming not to be.");}return false;}static boolean isRunningInGTIDConsistencyMode(JdbcTemplate jdbcTemplate) {try {String gtidConsistency = jdbcTemplate.queryForString("SELECT @@GLOBAL.ENFORCE_GTID_CONSISTENCY");if ("ON".equals(gtidConsistency)) {log.debug("Detected GTID consistency being enforced");return true;}} catch (SQLException e) {log.debug("Unable to detect whether database enforces GTID consistency. Assuming not.");}return false;}boolean isMySQL() {return databaseType instanceof MySQLDatabaseType;}boolean isMariaDB() {return databaseType instanceof MariaDBDatabaseType;}boolean isPxcStrict() {return pxcStrict;}/** CREATE TABLE ... AS SELECT ... cannot be used in three scenarios:* - Percona XtraDB Cluster in strict mode doesn't support it* - TiDB doesn't support it (overridden elsewhere)* - When GTID consistency is being enforced. Note that if GTID_MODE is ON, then ENFORCE_GTID_CONSISTENCY is* necessarily ON as well.*/protected boolean isCreateTableAsSelectAllowed() {return !pxcStrict && !gtidConsistencyEnforced;}@Overridepublic String getRawCreateScript(Table table, boolean baseline) {String tablespace =configuration.getTablespace() == null? "": " TABLESPACE \"" + configuration.getTablespace() + "\"";String baselineMarker = "";if (baseline) {if (isCreateTableAsSelectAllowed()) {baselineMarker = " AS SELECT" +"     1 as \"installed_rank\"," +"     '" + configuration.getBaselineVersion() + "' as \"version\"," +"     '" + configuration.getBaselineDescription() + "' as \"description\"," +"     '" + MigrationType.BASELINE + "' as \"type\"," +"     '" + configuration.getBaselineDescription() + "' as \"script\"," +"     NULL as \"checksum\"," +"     '" + getInstalledBy() + "' as \"installed_by\"," +"     CURRENT_TIMESTAMP as \"installed_on\"," +"     0 as \"execution_time\"," +"     TRUE as \"success\"\n";} else {// Revert to regular insert, which unfortunately is not safe in concurrent scenarios// due to MySQL implicit commits after DDL statements.baselineMarker = ";\n" + getBaselineStatement(table);}}return "CREATE TABLE " + table + " (\n" +"    `installed_rank` INT NOT NULL,\n" +"    &

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