Liquibase is a database table structure iterative evolution of change management tools. Developers can not write directly for a particular SQL database to create, update, or delete database objects, but is defined by the XML, YAML, JSON and other documents describing the change in the structure of the database table that they need these changes can contain tables , views, columns, indexes, foreignkeys, primarykeys, uniqueconstraints, data.
Official website address:
Built-in database, there are four ways to change the configuration file:
1, XML format
<?xml version="1.0" encoding="UTF-8"?>
<databaseChangeLog
xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd
http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
<preConditions>
<runningAs username="liquibase"/>
</preConditions>
<changeSet id="1" author="nvoxland">
<createTable tableName="person">
<column name="id" type="int" autoIncrement="true">
<constraints primaryKey="true" nullable="false"/>
</column>
<column name="firstname" type="varchar(50)"/>
<column name="lastname" type="varchar(50)">
<constraints nullable="false"/>
</column>
<column name="state" type="char(2)"/>
</createTable>
</changeSet>
<changeSet id="2" author="nvoxland">
<addColumn tableName="person">
<column name="username" type="varchar(8)"/>
</addColumn>
</changeSet>
<changeSet id="3" author="nvoxland">
<addLookupTable
existingTableName="person" existingColumnName="state"
newTableName="state" newColumnName="id" newColumnDataType="char(2)"/>
</changeSet>
</databaseChangeLog>2, YAML format
databaseChangeLog:
- preConditions:
- runningAs:
username: liquibase
- changeSet:
id: 1
author: nvoxland
changes:
- createTable:
tableName: person
columns:
- column:
name: id
type: int
autoIncrement: true
constraints:
primaryKey: true
nullable: false
- column:
name: firstname
type: varchar(50)
- column:
name: lastname
type: varchar(50)
constraints:
nullable: false
- column:
name: state
type: char(2)
- changeSet:
id: 2
author: nvoxland
changes:
- addColumn:
tableName: person
columns:
- column:
name: username
type: varchar(8)
- changeSet:
id: 3
author: nvoxland
changes:
- addLookupTable:
existingTableName: person
existingColumnName:state
newTableName: state
newColumnName: id
newColumnDataType: char(2)3, JSON format
{
"databaseChangeLog": [
{
"preConditions": [
{
"runningAs": {
"username": "liquibase"
}
}
]
},
{
"changeSet": {
"id": "1",
"author": "nvoxland",
"changes": [
{
"createTable": {
"tableName": "person",
"columns": [
{
"column": {
"name": "id",
"type": "int",
"autoIncrement": true,
"constraints": {
"primaryKey": true,
"nullable": false
},
}
},
{
"column": {
"name": "firstname",
"type": "varchar(50)"
}
},
{
"column": {
"name": "lastname",
"type": "varchar(50)"
"constraints": {
"nullable": false
},
}
},
{
"column": {
"name": "state",
"type": "char(2)"
}
}
]
}
}
]
}
},
{
"changeSet": {
"id": "2",
"author": "nvoxland",
"changes": [
{
"addColumn": {
"tableName": "person",
"columns": [
{
"column": {
"name": "username",
"type": "varchar(8)"
}
}
]
}
}
]
}
},
{
"changeSet": {
"id": "3",
"author": "nvoxland",
"changes": [
{
"addLookupTable": {
"tableName": "person",
"existingTableName": "person",
"existingColumnName":"state",
"newTableName": "state",
"newColumnName": "id",
"newColumnDataType": "char(2)",
}
}
]
}
}
]
}4, SQL format
--liquibase formatted sql
--changeset nvoxland:1
create table person (
id int not null primary key,
firstname varchar(80),
lastname varchar(80) not null,
state varchar(2)
);
--changeset nvoxland:2
alter table person add column username varchar(8)
--changeset nvoxland:3
create table state AS SELECT DISTINCT state AS id FROM person WHERE state IS NOT NULL;
alter table state modify id char(2) NOT NULL;
alter table state add primary key(id);
alter table person add constraint fk_person_state foreign key (state) references state(id);Report: Database sustained delivery capacity provider Datical
Datical official website: https://www.datical.com/liquibase/
Examples:
Since the use of two databases (H2 and MySQL) to verify that it is driven while loading both databases
Dependent on configuration
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.feng</groupId>
<artifactId>liqiubase-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>liqiubase-demo</name>
<description>Liqiubase测试</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>LiqiubaseConfig.java
import liquibase.integration.spring.SpringLiquibase;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
@Configuration
public class LiquibaseConfig {
@Bean
public SpringLiquibase liquibase(DataSource dataSource) {
SpringLiquibase springLiquibase = new SpringLiquibase();
springLiquibase.setDataSource(dataSource);// 数据源直接在application.yml或application.properties中配置
springLiquibase.setChangeLog("classpath:db/db.changelog-master.yml");
springLiquibase.setContexts("development,test,production");
springLiquibase.setShouldRun(true);
return springLiquibase;
}
}application.yml (when using MySQL) configuration
spring:
application:
name: liqiubase-demo
h2:
console:
enabled: true
# datasource:
# url: jdbc:h2:file:~/.h2/testdb
datasource:
driver-class-name: com.mysql.jdbc.Driver
username: root
password:
url: jdbc:mysql://localhost:3309/liqiubase-demo?useSSL=false&useUnicode=true&characterEncoding=UTF-8
liquibase:
enabled: true
server:
port: 62application.yml (H2 when used) Configuration
spring:
application:
name: liqiubase-demo
h2:
console:
enabled: true #用于启动H2 Web管理界面
datasource:
url: jdbc:h2:file:~/.h2/testdb
# datasource:
# driver-class-name: com.mysql.jdbc.Driver
# username: root
# password:
# url: jdbc:mysql://localhost:3309/liqiubase-demo?useSSL=false&useUnicode=true&characterEncoding=UTF-8
liquibase:
enabled: true
server:
port: 62resources/db/db.changelog-master.yml
databaseChangeLog:
- changeSet:
id: 1
author: nvoxland
changes:
- createTable:
tableName: person
columns:
- column:
name: id
type: int
autoIncrement: true
constraints:
primaryKey: true
nullable: false
- column:
name: firstname
type: varchar(50)
- column:
name: lastname
type: varchar(50)
constraints:
nullable: false
- column:
name: state
type: char(2)
- changeSet:
id: 2
author: nvoxland
changes:
- addColumn:
tableName: person
columns:
- column:
name: username
type: varchar(8)
- changeSet:
id: 3
author: nvoxland
changes:
- addLookupTable:
existingTableName: person
existingColumnName: state
newTableName: state
newColumnName: id
newColumnDataType: char(2)After starting the project, the target database (MySQL) even more variants according to the log, automatically create a table
Another: H2 database management interface path http: // localhost: 62 / h2 -console
Description: The corresponding screenshots not uploaded, forgive me
Source: https://github.com/jianbo-feng/public-repository (that can be a big brother, a point of praise)