首先说明本实例包含了
1、达梦数据库迁移
2、SpringBoot与flowable工作流(flowable版本是6.7.0)替换达梦数据库
3、xml中的sql替换
这篇文章应该是全网最细的应该没错吧,收藏吧~
后面的东方通TongWeb的改造以及部署会写在我的另一篇文章。
访问达梦官网:
首先注册一个账号
下载勾选指定版本的数据库管理工具 x86 、win64
解压压缩包
双击.iso文件,setup.exe傻瓜式安装。
注意:点击初始化
创建数据库实例
一直下一步,完成。
安装完会有这些软件,如下:一般用到的是数据库管理工具和迁移工具
ps: 数据库管理工具中管理员的用户名和密码都是 SYSDBA
注意达梦数据库名就对应创建的用户名 ,模式就对应数据库也即用户对象,但是一个用户也有可能会创建多个模式,这样就有可能需要在Springboot项目的配置文件里指定默认的模式(数据库)。
先拿到要改造的项目的初始代码,运行起来,保证没改造之前是可行的。
省略
如果install有如下问题:
这个问题一般就是test下的测试类有问题,造成编译时失败,比如在控制台执行命令 mvn test
报错如下:
**解决办法:**编译install的时候先跳过test的执行,需要在pom.xml的里添加以下配置,使得测试出错不影响项目的编译。
pom中加入如下依赖
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</build>
加完之后 clean install 然后重新编译 点击这个 m 图标 输入 mvn idea:idea
直接运行
首先打开前端控制台,下载依赖
npm install
然后修改 vue.config.js配置文件中的代理配置(这里的代理地址就是访问后端接口的地址),连上后端
然后保存ctrl+s,一定要记得保存配置才生效
npm run dev
把本地的mysql数据库迁移到达梦数据库。(首先这里迁移为了不影响之前的项目代码,我选择把源代码备份了一份,并新建备份了一个mysql数据库,修改了yml中的配置连接,下面会详细介绍)
迁移我选择了用上面安装的达梦数据库迁移工具
上面提到过,达梦的数据库就对应用户对象,所以现在新建用户(数据库)
这里用户名就是数据库名,只能为大写,密码就是和mysql差不多的用户密码
系统授权
点击确定,这里会提示失败,不用管,关闭后刷新用户,已经新建成功。
此时,用户和数据库已经建好了。模式就对应数据库。里面有对应的数据库表。
SYSDBA密码默认就是SYSDBA
点击下一步
选择mysql到dm,下一步.
连接源mysql数据库,首先指定驱动
本地先下载mysql驱动
mysql驱动
链接:https://pan.baidu.com/s/1nRELoWeRzcklpEtK8MNtYA
提取码:1111
填写完下一步
同理,指定达梦驱动,与数据库
达梦驱动链接:https://pan.baidu.com/s/1CDg2nMwY0s94Lp3gQ3j2cQ
提取码:1111
下一步
去掉使用默认数据类型映射关系的勾,然后点击右边配置类型映射关系按钮
点击右下角添加,原数据类型名VARCHAR,目的数据类型名VARCHAR,目的精度扩大倍数填入4,确定
选择需要迁移到的达梦数据库(模式),下一步
选择勾选指定的表,下一步
点击完成
这里有一个报错信息,记录超长
解决方案:先在达梦下执行设置表为记录超长脚本,删除数据再重新迁此表数据(在达梦数据库管理工具修改表)。
# 选择模式
set schema TRADING_CENTER_DM;
alter table SYS_OPER_LOG enable using long row;
truncate table SYS_OPER_LOG;
select * from SYS_OPER_LOG;
回到迁移工具,上一步,选择模式,选择表重新迁移这张失败的表即可。
这里数据库就迁移完了。
jar包地址在上面迁移的时候有发过
把jar包安装到maven仓库
mvn install:install-file -Dfile=E:\Dameng\DmJdbcDriver18.jar -DgroupId=com.dm -DartifactId=DmJdbcDriver18 -Dversion=1.8 -Dpackaging=jar
在admin模块添加达梦的驱动依赖
<!-- DM8 jdbc -->
<dependency>
<groupId>com.dm</groupId>
<artifactId>DmJdbcDriver18</artifactId>
<version>1.8</version>
</dependency>
此时重启项目会遇到编译报错,在没加pom依赖之前是可以启动的,加了之后启动编译build构建就会报错。所以先修改连接驱动yml配置。
# 数据源配置
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
# driverClassName: com.mysql.cj.jdbc.Driver
driverClassName: dm.jdbc.driver.DmDriver
druid:
# 主库数据源
# master:
# url: jdbc:mysql://121.43.234.114:3306/trading_center?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
# username: root
# password: gds12345678
#主库数据源(本地mysql数据库)
# master:
# url: jdbc:mysql://localhost:3306/trading_center_dm?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
# username: root
# password: 123
# 主库数据源(本地达梦数据库)
master:
url: jdbc:dm://127.0.0.1:5236?TRADING_CENTER_DM&zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8
username: SYSDBA
password: SYSDBA
# 从库数据源
slave:
# 从数据源开关/默认关闭
enabled: false
url:
username:
password:
# 初始连接数
initialSize: 5
# 最小连接池数量
minIdle: 10
# 最大连接池数量
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
minEvictableIdleTimeMillis: 300000
# 配置一个连接在池中最大生存的时间,单位是毫秒
maxEvictableIdleTimeMillis: 900000
# 配置检测连接是否有效
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
webStatFilter:
enabled: true
statViewServlet:
enabled: true
# 设置白名单,不填则允许所有访问
allow:
url-pattern: /druid/*
# 控制台管理用户名和密码
login-username: ruoyi
login-password: 123456
filter:
stat:
enabled: true
# 慢SQL记录
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: true
wall:
config:
multi-statement-allow: true
参考上面的修改,记得达梦数据库名就是用户名。
注意url中数据库的格式 为 ?数据库名 和mysql的不一样,不然的话就会url有下面这种网络通信异常。
报错信息:
16:46:16.112 [restartedMain] ERROR c.a.d.p.DruidDataSource - [init,931] - init datasource error, url: jdbc:dm://127.0.0.1:5236/TRADING_CENTER_DM?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8
dm.jdbc.driver.DMException: 网络通信异常
at dm.jdbc.driver.DBError.throwException(DBError.java:774)
at dm.jdbc.a.a.init(DBAccess.java:185)
at dm.jdbc.a.a.<init>(DBAccess.java:157)
at dm.jdbc.driver.DmdbConnection.openConnection(DmdbConnection.java:638)
at dm.jdbc.desc.EP.connect(EP.java:159)
at dm.jdbc.desc.EPGroup$EPSelector.select(EPGroup.java:395)
at dm.jdbc.desc.EPGroup.connect(EPGroup.java:278)
at dm.jdbc.driver.DmDriver.do_connect(DmDriver.java:163)
at dm.jdbc.driver.DmDriver.connect(DmDriver.java:449)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:251)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
然后由于本项目使用了flowable,启动后会出现工作流找不到驱动类型的报错如下,、
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: couldn't deduct database type from database product name 'DM DBMS'
所以还得修改flowable整合达梦的问题。
pom依赖和修改达梦驱动参考上面的介绍。下面主要是介绍flowable整合达梦。(flowable的版本是6.7.0)
自动加载数据源时,flowable无法识别DM数据库类型,采用覆盖源码,(就是在java包路径下创建与源码类相同的的路径,把源代码全部复制到这个类里面,然后在修改达梦的代码)。设置成MySQL或者Oracle的数据库类型,需要修改文件:
在项目中创建org.flowable.common.engine.impl.AbstractEngineConfiguration文件(这边路径必须一致,打包时会覆盖源文件),修改其中getDefaultDatabaseTypeMappings方法,将达梦数据库标识为mysql(value值设置为其他值会报错空指针。所以通用mysql),复制完源码后修改源码里面的这个方法,如下
public static final String DATABASE_TYPE_DM = "mysql"; //达梦 value值设置为其他值会报错空指针。所以通用mysql
public static Properties getDefaultDatabaseTypeMappings() {
Properties databaseTypeMappings = new Properties();
databaseTypeMappings.setProperty("H2", DATABASE_TYPE_H2);
databaseTypeMappings.setProperty("HSQL Database Engine", DATABASE_TYPE_HSQL);
databaseTypeMappings.setProperty("MySQL", DATABASE_TYPE_MYSQL);
databaseTypeMappings.setProperty("MariaDB", DATABASE_TYPE_MYSQL);
databaseTypeMappings.setProperty("Oracle", DATABASE_TYPE_ORACLE);
databaseTypeMappings.setProperty(PRODUCT_NAME_POSTGRES, DATABASE_TYPE_POSTGRES);
databaseTypeMappings.setProperty("Microsoft SQL Server", DATABASE_TYPE_MSSQL);
databaseTypeMappings.setProperty(DATABASE_TYPE_DB2, DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/NT64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDP", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUX390", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXX8664", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXZ64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXPPC64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/LINUXPPC64LE", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/400 SQL", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/6000", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB iSeries", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/AIX64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HPUX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/HP64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/SUN64", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/PTX", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2/2", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty("DB2 UDB AS400", DATABASE_TYPE_DB2);
databaseTypeMappings.setProperty(PRODUCT_NAME_CRDB, DATABASE_TYPE_COCKROACHDB);
databaseTypeMappings.setProperty("DM DBMS", DATABASE_TYPE_DM);// 加入达梦支持
return databaseTypeMappings;
}
在java文件夹下创建DmDatabase类,全路径为liquibase.database.core.DmDatabase,参考了liquibase.database.core.OracleDatabase类,将下面代码直接粘进新创建的类。
在这个类中由作者介绍更改如下:
删除setConnection方法;
修改PRODUCT_NAME常量值为“DM DBMS”;
修改getDefaultPort方法,返回5236;
修改getShortName方法,返回dm;
修改getDefaultDriver方法,返回达梦的Driver;
下面这个代码可以直接复制我的,上面那个代码注意需要自己修改
package liquibase.database.core;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import liquibase.CatalogAndSchema;
import liquibase.Scope;
import liquibase.database.AbstractJdbcDatabase;
import liquibase.database.DatabaseConnection;
import liquibase.database.OfflineConnection;
import liquibase.database.jvm.JdbcConnection;
import liquibase.exception.DatabaseException;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.exception.ValidationErrors;
import liquibase.executor.ExecutorService;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.SequenceCurrentValueFunction;
import liquibase.statement.SequenceNextValueFunction;
import liquibase.statement.core.RawCallStatement;
import liquibase.statement.core.RawSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Catalog;
import liquibase.structure.core.Index;
import liquibase.structure.core.PrimaryKey;
import liquibase.structure.core.Schema;
import liquibase.util.JdbcUtils;
import liquibase.util.StringUtil;
public class DmDatabase extends AbstractJdbcDatabase {
private static final String PRODUCT_NAME = "DM DBMS";
@Override
protected String getDefaultDatabaseProductName() {
return PRODUCT_NAME;
}
/**
* Is this AbstractDatabase subclass the correct one to use for the given connection.
*
* @param conn
*/
@Override
public boolean isCorrectDatabaseImplementation(DatabaseConnection conn) throws DatabaseException {
return PRODUCT_NAME.equalsIgnoreCase(conn.getDatabaseProductName());
}
/**
* If this database understands the given url, return the default driver class name. Otherwise return null.
*
* @param url
*/
@Override
public String getDefaultDriver(String url) {
if (url.startsWith("jdbc:dm")) {
return "dm.jdbc.driver.DmDriver";
}
return null;
}
/**
* Returns an all-lower-case short name of the product. Used for end-user selecting of database type
* such as the DBMS precondition.
*/
@Override
public String getShortName() {
return "dm";
}
@Override
public Integer getDefaultPort() {
return 5236;
}
/**
* Returns whether this database support initially deferrable columns.
*/
@Override
public boolean supportsInitiallyDeferrableColumns() {
return true;
}
@Override
public boolean supportsTablespaces() {
return true;
}
@Override
public int getPriority() {
return PRIORITY_DEFAULT;
}
private static final Pattern PROXY_USER = Pattern.compile(".*(?:thin|oci)\\:(.+)/@.*");
protected final int SHORT_IDENTIFIERS_LENGTH = 30;
protected final int LONG_IDENTIFIERS_LEGNTH = 128;
public static final int ORACLE_12C_MAJOR_VERSION = 12;
private Set<String> reservedWords = new HashSet<>();
private Set<String> userDefinedTypes;
private Map<String, String> savedSessionNlsSettings;
private Boolean canAccessDbaRecycleBin;
private Integer databaseMajorVersion;
private Integer databaseMinorVersion;
/**
* Default constructor for an object that represents the Oracle Database DBMS.
*/
public DmDatabase() {
super.unquotedObjectsAreUppercased = true;
//noinspection HardCodedStringLiteral
super.setCurrentDateTimeFunction("SYSTIMESTAMP");
// Setting list of Oracle's native functions
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("SYSDATE"));
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("SYSTIMESTAMP"));
//noinspection HardCodedStringLiteral
dateFunctions.add(new DatabaseFunction("CURRENT_TIMESTAMP"));
//noinspection HardCodedStringLiteral
super.sequenceNextValueFunction = "%s.nextval";
//noinspection HardCodedStringLiteral
super.sequenceCurrentValueFunction = "%s.currval";
}
private void tryProxySession(final String url, final Connection con) {
Matcher m = PROXY_USER.matcher(url);
if (m.matches()) {
Properties props = new Properties();
props.put("PROXY_USER_NAME", m.group(1));
try {
Method method = con.getClass().getMethod("openProxySession", int.class, Properties.class);
method.setAccessible(true);
method.invoke(con, 1, props);
} catch (Exception e) {
Scope.getCurrentScope().getLog(getClass()).info("Could not open proxy session on OracleDatabase: " + e.getCause().getMessage());
}
}
}
@Override
public int getDatabaseMajorVersion() throws DatabaseException {
if (databaseMajorVersion == null) {
return super.getDatabaseMajorVersion();
} else {
return databaseMajorVersion;
}
}
@Override
public int getDatabaseMinorVersion() throws DatabaseException {
if (databaseMinorVersion == null) {
return super.getDatabaseMinorVersion();
} else {
return databaseMinorVersion;
}
}
@Override
public String getJdbcCatalogName(CatalogAndSchema schema) {
return null;
}
@Override
public String getJdbcSchemaName(CatalogAndSchema schema) {
return correctObjectName((schema.getCatalogName() == null) ? schema.getSchemaName() : schema.getCatalogName(), Schema.class);
}
@Override
protected String getAutoIncrementClause(final String generationType, final Boolean defaultOnNull) {
if (StringUtil.isEmpty(generationType)) {
return super.getAutoIncrementClause();
}
String autoIncrementClause = "GENERATED %s AS IDENTITY"; // %s -- [ ALWAYS | BY DEFAULT [ ON NULL ] ]
String generationStrategy = generationType;
if (Boolean.TRUE.equals(defaultOnNull) && generationType.toUpperCase().equals("BY DEFAULT")) {
generationStrategy += " ON NULL";
}
return String.format(autoIncrementClause, generationStrategy);
}
@Override
public String generatePrimaryKeyName(String tableName) {
if (tableName.length() > 27) {
//noinspection HardCodedStringLiteral
return "PK_" + tableName.toUpperCase(Locale.US).substring(0, 27);
} else {
//noinspection HardCodedStringLiteral
return "PK_" + tableName.toUpperCase(Locale.US);
}
}
@Override
public boolean isReservedWord(String objectName) {
return reservedWords.contains(objectName.toUpperCase());
}
@Override
public boolean supportsSequences() {
return true;
}
/**
* Oracle supports catalogs in liquibase terms
*
* @return false
*/
@Override
public boolean supportsSchemas() {
return false;
}
@Override
protected String getConnectionCatalogName() throws DatabaseException {
if (getConnection() instanceof OfflineConnection) {
return getConnection().getCatalog();
}
try {
//noinspection HardCodedStringLiteral
return Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForObject(new RawCallStatement("select sys_context( 'userenv', 'current_schema' ) from dual"), String.class);
} catch (Exception e) {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Error getting default schema", e);
}
return null;
}
@Override
public String getDefaultCatalogName() {//NOPMD
return (super.getDefaultCatalogName() == null) ? null : super.getDefaultCatalogName().toUpperCase(Locale.US);
}
/**
* Returns an Oracle date literal with the same value as a string formatted using ISO 8601.
*
* Convert an ISO8601 date string to one of the following results:
* to_date('1995-05-23', 'YYYY-MM-DD')
* to_date('1995-05-23 09:23:59', 'YYYY-MM-DD HH24:MI:SS')
*
* Implementation restriction:
* Currently, only the following subsets of ISO8601 are supported:
*
* - YYYY-MM-DD
* - YYYY-MM-DDThh:mm:ss
*
*/
@Override
public String getDateLiteral(String isoDate) {
String normalLiteral = super.getDateLiteral(isoDate);
if (isDateOnly(isoDate)) {
return "TO_DATE(" + normalLiteral + ", 'YYYY-MM-DD')";
} else if (isTimeOnly(isoDate)) {
return "TO_DATE(" + normalLiteral + ", 'HH24:MI:SS')";
} else if (isTimestamp(isoDate)) {
return "TO_TIMESTAMP(" + normalLiteral + ", 'YYYY-MM-DD HH24:MI:SS.FF')";
} else if (isDateTime(isoDate)) {
int seppos = normalLiteral.lastIndexOf('.');
if (seppos != -1) {
normalLiteral = normalLiteral.substring(0, seppos) + "'";
}
return "TO_DATE(" + normalLiteral + ", 'YYYY-MM-DD HH24:MI:SS')";
}
return "UNSUPPORTED:" + isoDate;
}
@Override
public boolean isSystemObject(DatabaseObject example) {
if (example == null) {
return false;
}
if (this.isLiquibaseObject(example)) {
return false;
}
if (example instanceof Schema) {
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
if ("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName())) {
return true;
}
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
if ("SYSTEM".equals(example.getSchema().getCatalogName()) || "SYS".equals(example.getSchema().getCatalogName()) || "CTXSYS".equals(example.getSchema().getCatalogName()) || "XDB".equals(example.getSchema().getCatalogName())) {
return true;
}
} else if (isSystemObject(example.getSchema())) {
return true;
}
if (example instanceof Catalog) {
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
if (("SYSTEM".equals(example.getName()) || "SYS".equals(example.getName()) || "CTXSYS".equals(example.getName()) || "XDB".equals(example.getName()))) {
return true;
}
} else if (example.getName() != null) {
//noinspection HardCodedStringLiteral
if (example.getName().startsWith("BIN$")) { //oracle deleted table
boolean filteredInOriginalQuery = this.canAccessDbaRecycleBin();
if (!filteredInOriginalQuery) {
filteredInOriginalQuery = StringUtil.trimToEmpty(example.getSchema().getName()).equalsIgnoreCase(this.getConnection().getConnectionUserName());
}
if (filteredInOriginalQuery) {
return !((example instanceof PrimaryKey) || (example instanceof Index) || (example instanceof
liquibase.statement.UniqueConstraint));
} else {
return true;
}
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("AQ$")) { //oracle AQ tables
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("DR$")) { //oracle index tables
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("SYS_IOT_OVER")) { //oracle system table
return true;
} else //noinspection HardCodedStringLiteral,HardCodedStringLiteral
if ((example.getName().startsWith("MDRT_") || example.getName().startsWith("MDRS_")) && example.getName().endsWith("$")) {
// CORE-1768 - Oracle creates these for spatial indices and will remove them when the index is removed.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("MLOG$_")) { //Created by materliaized view logs for every table that is part of a materialized view. Not available for DDL operations.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("RUPD$_")) { //Created by materialized view log tables using primary keys. Not available for DDL operations.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("WM$_")) { //Workspace Manager backup tables.
return true;
} else //noinspection HardCodedStringLiteral
if ("CREATE$JAVA$LOB$TABLE".equals(example.getName())) { //This table contains the name of the Java object, the date it was loaded, and has a BLOB column to store the Java object.
return true;
} else //noinspection HardCodedStringLiteral
if ("JAVA$CLASS$MD5$TABLE".equals(example.getName())) { //This is a hash table that tracks the loading of Java objects into a schema.
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("ISEQ$$_")) { //System-generated sequence
return true;
} else //noinspection HardCodedStringLiteral
if (example.getName().startsWith("USLOG$")) { //for update materialized view
return true;
} else if (example.getName().startsWith("SYS_FBA")) { //for Flashback tables
return true;
}
}
return super.isSystemObject(example);
}
@Override
public boolean supportsAutoIncrement() {
// Oracle supports Identity beginning with version 12c
boolean isAutoIncrementSupported = false;
try {
if (getDatabaseMajorVersion() >= 12) {
isAutoIncrementSupported = true;
}
// Returning true will generate create table command with 'IDENTITY' clause, example:
// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) GENERATED BY DEFAULT AS IDENTITY NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));
// While returning false will continue to generate create table command without 'IDENTITY' clause, example:
// CREATE TABLE AutoIncTest (IDPrimaryKey NUMBER(19) NOT NULL, TypeID NUMBER(3) NOT NULL, Description NVARCHAR2(50), CONSTRAINT PK_AutoIncTest PRIMARY KEY (IDPrimaryKey));
} catch (DatabaseException ex) {
isAutoIncrementSupported = false;
}
return isAutoIncrementSupported;
}
// public Set findUniqueConstraints(String schema) throws DatabaseException {
// Set returnSet = new HashSet();
//
// List
//
// UniqueConstraint constraint = null;
// for (Map map : maps) {
// if (constraint == null || !constraint.getName().equals(constraint.getName())) {
// returnSet.add(constraint);
// Table table = new Table((String) map.get("TABLE_NAME"));
// constraint = new UniqueConstraint(map.get("CONSTRAINT_NAME").toString(), table);
// }
// }
// if (constraint != null) {
// returnSet.add(constraint);
// }
//
// return returnSet;
// }
@Override
public boolean supportsRestrictForeignKeys() {
return false;
}
@Override
public int getDataTypeMaxParameters(String dataTypeName) {
//noinspection HardCodedStringLiteral
if ("BINARY_FLOAT".equals(dataTypeName.toUpperCase())) {
return 0;
}
//noinspection HardCodedStringLiteral
if ("BINARY_DOUBLE".equals(dataTypeName.toUpperCase())) {
return 0;
}
return super.getDataTypeMaxParameters(dataTypeName);
}
public String getSystemTableWhereClause(String tableNameColumn) {
List<String> clauses = new ArrayList<String>(Arrays.asList("BIN$",
"AQ$",
"DR$",
"SYS_IOT_OVER",
"MLOG$_",
"RUPD$_",
"WM$_",
"ISEQ$$_",
"USLOG$",
"SYS_FBA"));
for (int i = 0; i < clauses.size(); i++) {
clauses.set(i, tableNameColumn + " NOT LIKE '" + clauses.get(i) + "%'");
}
return "(" + StringUtil.join(clauses, " AND ") + ")";
}
@Override
public boolean jdbcCallsCatalogsSchemas() {
return true;
}
public Set<String> getUserDefinedTypes() {
if (userDefinedTypes == null) {
userDefinedTypes = new HashSet<>();
if ((getConnection() != null) && !(getConnection() instanceof OfflineConnection)) {
try {
try {
//noinspection HardCodedStringLiteral
userDefinedTypes.addAll(Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForList(new RawSqlStatement("SELECT DISTINCT TYPE_NAME FROM ALL_TYPES"), String.class));
} catch (DatabaseException e) { //fall back to USER_TYPES if the user cannot see ALL_TYPES
//noinspection HardCodedStringLiteral
userDefinedTypes.addAll(Scope.getCurrentScope().getSingleton(ExecutorService.class).getExecutor("jdbc", this).queryForList(new RawSqlStatement("SELECT TYPE_NAME FROM USER_TYPES"), String.class));
}
} catch (DatabaseException e) {
//ignore error
}
}
}
return userDefinedTypes;
}
@Override
public String generateDatabaseFunctionValue(DatabaseFunction databaseFunction) {
//noinspection HardCodedStringLiteral
if ((databaseFunction != null) && "current_timestamp".equalsIgnoreCase(databaseFunction.toString())) {
return databaseFunction.toString();
}
if ((databaseFunction instanceof SequenceNextValueFunction) || (databaseFunction instanceof
SequenceCurrentValueFunction)) {
String quotedSeq = super.generateDatabaseFunctionValue(databaseFunction);
// replace "myschema.my_seq".nextval with "myschema"."my_seq".nextval
return quotedSeq.replaceFirst("\"([^\\.\"]+)\\.([^\\.\"]+)\"", "\"$1\".\"$2\"");
}
return super.generateDatabaseFunctionValue(databaseFunction);
}
@Override
public ValidationErrors validate() {
ValidationErrors errors = super.validate();
DatabaseConnection connection = getConnection();
if ((connection == null) || (connection instanceof OfflineConnection)) {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).info("Cannot validate offline database");
return errors;
}
if (!canAccessDbaRecycleBin()) {
errors.addWarning(getDbaRecycleBinWarning());
}
return errors;
}
public String getDbaRecycleBinWarning() {
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral,
// HardCodedStringLiteral
//noinspection HardCodedStringLiteral,HardCodedStringLiteral,HardCodedStringLiteral
return "Liquibase needs to access the DBA_RECYCLEBIN table so we can automatically handle the case where " +
"constraints are deleted and restored. Since Oracle doesn't properly restore the original table names " +
"referenced in the constraint, we use the information from the DBA_RECYCLEBIN to automatically correct this" +
" issue.\n" +
"\n" +
"The user you used to connect to the database (" + getConnection().getConnectionUserName() +
") needs to have \"SELECT ON SYS.DBA_RECYCLEBIN\" permissions set before we can perform this operation. " +
"Please run the following SQL to set the appropriate permissions, and try running the command again.\n" +
"\n" +
" GRANT SELECT ON SYS.DBA_RECYCLEBIN TO " + getConnection().getConnectionUserName() + ";";
}
public boolean canAccessDbaRecycleBin() {
if (canAccessDbaRecycleBin == null) {
DatabaseConnection connection = getConnection();
if ((connection == null) || (connection instanceof OfflineConnection)) {
return false;
}
Statement statement = null;
try {
statement = ((JdbcConnection) connection).createStatement();
@SuppressWarnings("HardCodedStringLiteral") ResultSet resultSet = statement.executeQuery("select 1 from dba_recyclebin where 0=1");
resultSet.close(); //don't need to do anything with the result set, just make sure statement ran.
this.canAccessDbaRecycleBin = true;
} catch (Exception e) {
//noinspection HardCodedStringLiteral
if ((e instanceof SQLException) && e.getMessage().startsWith("ORA-00942")) { //ORA-00942: table or view does not exist
this.canAccessDbaRecycleBin = false;
} else {
//noinspection HardCodedStringLiteral
Scope.getCurrentScope().getLog(getClass()).warning("Cannot check dba_recyclebin access", e);
this.canAccessDbaRecycleBin = false;
}
} finally {
JdbcUtils.close(null, statement);
}
}
return canAccessDbaRecycleBin;
}
@Override
public boolean supportsNotNullConstraintNames() {
return true;
}
/**
* Tests if the given String would be a valid identifier in Oracle DBMS. In Oracle, a valid identifier has
* the following form (case-insensitive comparison):
* 1st character: A-Z
* 2..n characters: A-Z0-9$_#
* The maximum length of an identifier differs by Oracle version and object type.
*/
public boolean isValidOracleIdentifier(String identifier, Class<? extends DatabaseObject> type) {
if ((identifier == null) || (identifier.length() < 1))
return false;
if (!identifier.matches("^(i?)[A-Z][A-Z0-9\\$\\_\\#]*$"))
return false;
/*
* @todo It seems we currently do not have a class for tablespace identifiers, and all other classes
* we do know seem to be supported as 12cR2 long identifiers, so:
*/
return (identifier.length() <= LONG_IDENTIFIERS_LEGNTH);
}
/**
* Returns the maximum number of bytes (NOT: characters) for an identifier. For Oracle <=12c Release 20, this
* is 30 bytes, and starting from 12cR2, up to 128 (except for tablespaces, PDB names and some other rather rare
* object types).
*
* @return the maximum length of an object identifier, in bytes
*/
public int getIdentifierMaximumLength() {
try {
if (getDatabaseMajorVersion() < ORACLE_12C_MAJOR_VERSION) {
return SHORT_IDENTIFIERS_LENGTH;
} else if ((getDatabaseMajorVersion() == ORACLE_12C_MAJOR_VERSION) && (getDatabaseMinorVersion() <= 1)) {
return SHORT_IDENTIFIERS_LENGTH;
} else {
return LONG_IDENTIFIERS_LEGNTH;
}
} catch (DatabaseException ex) {
throw new UnexpectedLiquibaseException("Cannot determine the Oracle database version number", ex);
}
}
}
同理复制源码,覆盖修改。
在toDatabaseDataType方法中添加DmDatabase的支持
在isNumericBoolean方法中添加DmDatabase类型
具体代码如下:可以直接复制
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
package liquibase.datatype.core;
import java.util.Locale;
import liquibase.change.core.LoadDataChange;
import liquibase.change.core.LoadDataChange.LOAD_DATA_TYPE;
import liquibase.database.Database;
import liquibase.database.core.*;
import liquibase.datatype.DataTypeInfo;
import liquibase.datatype.DatabaseDataType;
import liquibase.datatype.LiquibaseDataType;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.statement.DatabaseFunction;
import liquibase.util.StringUtil;
@DataTypeInfo(
name = "boolean",
aliases = {"java.sql.Types.BOOLEAN", "java.lang.Boolean", "bit", "bool"},
minParameters = 0,
maxParameters = 0,
priority = 1
)
public class BooleanType extends LiquibaseDataType {
public BooleanType() {
}
@Override
public DatabaseDataType toDatabaseDataType(Database database) {
String originalDefinition = StringUtil.trimToEmpty(getRawDefinition());
if ((database instanceof Firebird3Database)) {
return new DatabaseDataType("BOOLEAN");
}
if ((database instanceof AbstractDb2Database) || (database instanceof FirebirdDatabase)) {
return new DatabaseDataType("SMALLINT");
} else if (database instanceof MSSQLDatabase) {
return new DatabaseDataType(database.escapeDataTypeName("bit"));
} else if (database instanceof MySQLDatabase) {
if (originalDefinition.toLowerCase(Locale.US).startsWith("bit")) {
return new DatabaseDataType("BIT", getParameters());
}
return new DatabaseDataType("BIT", 1);
} else if (database instanceof OracleDatabase) {
return new DatabaseDataType("NUMBER", 1);
} else if ((database instanceof SybaseASADatabase) || (database instanceof SybaseDatabase)) {
return new DatabaseDataType("BIT");
} else if (database instanceof DerbyDatabase) {
if (((DerbyDatabase) database).supportsBooleanDataType()) {
return new DatabaseDataType("BOOLEAN");
} else {
return new DatabaseDataType("SMALLINT");
}
} else if (database.getClass().isAssignableFrom(DB2Database.class)) {
if (((DB2Database) database).supportsBooleanDataType())
return new DatabaseDataType("BOOLEAN");
else
return new DatabaseDataType("SMALLINT");
} else if (database instanceof HsqlDatabase) {
return new DatabaseDataType("BOOLEAN");
} else if (database instanceof PostgresDatabase) {
if (originalDefinition.toLowerCase(Locale.US).startsWith("bit")) {
return new DatabaseDataType("BIT", getParameters());
}
} else if(database instanceof DmDatabase) {
return new DatabaseDataType("bit");
}
return super.toDatabaseDataType(database);
}
@Override
public String objectToSql(Object value, Database database) {
if ((value == null) || "null".equals(value.toString().toLowerCase(Locale.US))) {
return null;
}
String returnValue;
if (value instanceof String) {
value = ((String) value).replaceAll("'", "");
if ("true".equals(((String) value).toLowerCase(Locale.US)) || "1".equals(value) || "b'1'".equals(((String) value).toLowerCase(Locale.US)) || "t".equals(((String) value).toLowerCase(Locale.US)) || ((String) value).toLowerCase(Locale.US).equals(this.getTrueBooleanValue(database).toLowerCase(Locale.US))) {
returnValue = this.getTrueBooleanValue(database);
} else if ("false".equals(((String) value).toLowerCase(Locale.US)) || "0".equals(value) || "b'0'".equals(
((String) value).toLowerCase(Locale.US)) || "f".equals(((String) value).toLowerCase(Locale.US)) || ((String) value).toLowerCase(Locale.US).equals(this.getFalseBooleanValue(database).toLowerCase(Locale.US))) {
returnValue = this.getFalseBooleanValue(database);
} else {
throw new UnexpectedLiquibaseException("Unknown boolean value: " + value);
}
} else if (value instanceof Long) {
if (Long.valueOf(1).equals(value)) {
returnValue = this.getTrueBooleanValue(database);
} else {
returnValue = this.getFalseBooleanValue(database);
}
} else if (value instanceof Number) {
if (value.equals(1) || "1".equals(value.toString()) || "1.0".equals(value.toString())) {
returnValue = this.getTrueBooleanValue(database);
} else {
returnValue = this.getFalseBooleanValue(database);
}
} else if (value instanceof DatabaseFunction) {
return value.toString();
} else if (value instanceof Boolean) {
if (((Boolean) value)) {
returnValue = this.getTrueBooleanValue(database);
} else {
returnValue = this.getFalseBooleanValue(database);
}
} else {
throw new UnexpectedLiquibaseException("Cannot convert type " + value.getClass() + " to a boolean value");
}
return returnValue;
}
protected boolean isNumericBoolean(Database database) {
if (database instanceof DerbyDatabase) {
return !((DerbyDatabase) database).supportsBooleanDataType();
} else if (database.getClass().isAssignableFrom(DB2Database.class)) {
return !((DB2Database) database).supportsBooleanDataType();
}
return (database instanceof Db2zDatabase) || (database instanceof DB2Database) || (database instanceof FirebirdDatabase) || (database instanceof
MSSQLDatabase) || (database instanceof MySQLDatabase) || (database instanceof OracleDatabase) ||
(database instanceof SQLiteDatabase) || (database instanceof SybaseASADatabase) || (database instanceof
SybaseDatabase) || (database instanceof DmDatabase);
}
/**
* The database-specific value to use for "false" "boolean" columns.
*/
public String getFalseBooleanValue(Database database) {
if (isNumericBoolean(database)) {
return "0";
}
if (database instanceof InformixDatabase) {
return "'f'";
}
return "FALSE";
}
/**
* The database-specific value to use for "true" "boolean" columns.
*/
public String getTrueBooleanValue(Database database) {
if (isNumericBoolean(database)) {
return "1";
}
if (database instanceof InformixDatabase) {
return "'t'";
}
return "TRUE";
}
@Override
public LoadDataChange.LOAD_DATA_TYPE getLoadTypeName() {
return LoadDataChange.LOAD_DATA_TYPE.BOOLEAN;
}
}
添加DmDatabase支持。修改后的文件内如下,注意找不到源码的时候直接ctrl+shift+f 全局搜索即可。(也是在这个目录下建相同的文件,不能忘记,否者项目跑不起来!!!)
liquibase.database.core.CockroachDatabase
liquibase.database.core.DB2Database
liquibase.database.core.Db2zDatabase
liquibase.database.core.DerbyDatabase
liquibase.database.core.Firebird3Database
liquibase.database.core.FirebirdDatabase
liquibase.database.core.H2Database
liquibase.database.core.HsqlDatabase
liquibase.database.core.InformixDatabase
liquibase.database.core.Ingres9Database
liquibase.database.core.MSSQLDatabase
liquibase.database.core.MariaDBDatabase
liquibase.database.core.MockDatabase
liquibase.database.core.MySQLDatabase
liquibase.database.core.OracleDatabase
liquibase.database.core.PostgresDatabase
liquibase.database.core.SQLiteDatabase
liquibase.database.core.SybaseASADatabase
liquibase.database.core.SybaseDatabase
liquibase.database.core.DmDatabase
liquibase.database.core.UnsupportedDatabase
00:04:55.338 [restartedMain] ERROR o.f.c.e.i.d.CommonDbSchemaManager - [getProperty,198] - Could not get property from table ACT_GE_PROPERTY
dm.jdbc.driver.DMException: 第1 行附近出现错误:
无效的表或视图名[ACT_GE_PROPERTY]
在网上找的报错解决方案
配置mysql连接时加上:nullCatalogMeansCurrent=true。最终配置如下
# 数据源配置
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
# driverClassName: com.mysql.cj.jdbc.Driver
driverClassName: dm.jdbc.driver.DmDriver
druid:
# 主库数据源
# master:
# url: jdbc:mysql://121.43.234.114:3306/trading_center?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
# username: root
# password: gds12345678
#主库数据源(本地mysql数据库)
# master:
# url: jdbc:mysql://localhost:3306/trading_center_dm?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
# username: root
# password: 123
# 主库数据源(本地达梦数据库)
master:
url: jdbc:dm://127.0.0.1:5236?TRADING_CENTER_DM&zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=UTF-8&nullCatalogMeansCurrent=true
username: TRADING_CENTER_DM
password: TRADING_CENTER_DM
# 从库数据源
slave:
# 从数据源开关/默认关闭
enabled: false
url:
username:
password:
# 初始连接数
initialSize: 5
# 最小连接池数量
minIdle: 10
# 最大连接池数量
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
minEvictableIdleTimeMillis: 300000
# 配置一个连接在池中最大生存的时间,单位是毫秒
maxEvictableIdleTimeMillis: 900000
# 配置检测连接是否有效
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
webStatFilter:
enabled: true
statViewServlet:
enabled: true
# 设置白名单,不填则允许所有访问
allow:
url-pattern: /druid/*
# 控制台管理用户名和密码
login-username: ruoyi
login-password: 123456
filter:
stat:
enabled: true
# 慢SQL记录
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: true
wall:
config:
multi-statement-allow: true
mysql中的有些函数方式是达梦不支持的,所以要把部分sql替换为达梦支持的方式。(更多函数差别可以看官网文档或者本文章下面的附注)
本项目中主要修改的xml的sql如下
修改过sql的xml:
由于达梦数据库没有内置find_in_set函数,但项目中有用到,所以需要自定义函数,方便后续程序调用。
先切换模式
set schema TRADING_CENTER_DM;
再创建函数FIND_IN_SET
CREATE OR REPLACE FUNCTION FIND_IN_SET
(
piv_str1 varchar2,
piv_str2 varchar2,
p_sep varchar2 := ',')
RETURN NUMBER
IS
l_idx number:=0; -- 用于计算piv_str2中分隔符的位置
str varchar2(500); -- 根据分隔符截取的子字符串
piv_str varchar2(500) := piv_str2; -- 将piv_str2赋值给piv_str
res number :=0; -- 返回结果
loopIndex number :=0;
BEGIN
-- 如果piv_str中没有分割符,直接判断piv_str1和piv_str是否相等,相等 res=1
IF instr(piv_str, p_sep, 1) = 0 THEN
IF piv_str = piv_str1 THEN
res := 1;
END IF;
ELSE
-- 循环按分隔符截取piv_str
LOOP
l_idx := instr(piv_str, p_sep);
loopIndex:=loopIndex+1;
-- 当piv_str中还有分隔符时
IF l_idx > 0 THEN
-- 截取第一个分隔符前的字段str
str:= substr(piv_str, 1, l_idx-1);
-- 判断 str 和piv_str1 是否相等,相等 res=1 并结束循环判断
IF str = piv_str1 THEN
res:= loopIndex;
EXIT;
END IF;
piv_str := substr(piv_str, l_idx+length(p_sep));
ELSE
-- 当截取后的piv_str 中不存在分割符时,判断piv_str和piv_str1是否相等,相等 res=1
IF piv_str = piv_str1 THEN
res:= loopIndex;
END IF;
-- 无论最后是否相等,都跳出循环
EXIT;
END IF;
END LOOP;
-- 结束循环
END IF;
-- 返回res
RETURN res;
END FIND_IN_SET;
commit;
cast(),mysq有,达梦没有。
cast(xxx as SIGNED INTEGER) -- mysql函数
替换为
to_number(xxx) -- 达梦函数
cast(notice_content as char) --mysql函数 notice_content是longblob类型 转为了char
替换为
CONVERT(notice_content, SQL_CHAR) --达梦函数 notice_content是blob类型 转为了char
达梦的主键自增是不允许INSERT INTO语句中出现那个字段名的。就算赋值为null也会报错。
错误
INSERT INTO sys_logs_method ( Id, ActionTime, ActionBy, Type, IsDelete, Remark, Ip, ActionByName, ProjectNo, actionByAccount ) VALUES ( 0, ?, ?, ?, ?, ?, ?, ?, ?, ? )
错误
INSERT INTO sys_logs_method ( Id, ActionTime, ActionBy, Type, IsDelete, Remark, Ip, ActionByName, ProjectNo, actionByAccount ) VALUES ( null, ?, ?, ?, ?, ?, ?, ?, ?, ? )
正确
INSERT INTO sys_logs_method ( ActionTime, ActionBy, Type, IsDelete, Remark, Ip, ActionByName, ProjectNo, actionByAccount ) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ? )
修改过xml语句的详细情况见 目录6。
达梦不支持 date_sub 函数,使用 dateadd(datepart,n,date) 代替,其中,datepart可以为:year(yy,yyyy),quarter(qq,q),month(mm,m),dayofyear(dy,y),day(dd,d),week(wk,ww),weekday(dw),hour(hh), minute(mi,n), second(ss,s), millisecond(ms),
select dateadd(month, -6, now()); --dameng
select dateadd(month, 2, now()); --dameng
替换例子:
date_format(create_time,'%y%m%d') --mysql
替换为达梦
to_char(create_time, 'YYMMDD') --dameng
不支持 case-when-then-else
这里有一个若依框架中代码生成的case—when的例子
mysql写法
改达梦
若依框架的代码生成还有几个xml的方法也需要替换,如下:
根据源文件路径,在java包下新建java class文件,将源文件中代码粘贴到新创建的文件中,修改相关代码后保存,编译。
在target中找到编译后的class文件
找对源文件所在jar包,右键在文件管理中打开。
解压jar包,将修改后并编译的target中的class文件粘贴到jar包对应位置,然后重新打包成zip压缩包后修改后缀为.jar
批注:jar包中的源码修改后能用git提交吗
当你修改了一个 JAR 包中的源码后,你实际上修改了该 JAR 包的一个副本。这个修改并不会影响到原始的 JAR 包,因此无法直接使用 Git 提交这些修改。
如果依赖什么都没问题的话这个一般就是项目编译问题,把项目重新编译
点击Maven中的 M 按钮,然后输入下面的命令 把项目重新编译就可以运行了
mvn idea:idea
这里只提供常见的差异,详情还得根据改造后的功能进行测试,或者参考官方文档。
(1)创建表的时候,不支持在列的后面直接加comment注释,使用 COMMENT ON IS 代替,如:
COMMENT ON TABLE xxx IS xxx
COMMENT ON COLUMN xxx IS xxx
(2)不支持 date_sub 函数,使用 dateadd(datepart,n,date) 代替,其中,datepart可以为:year(yy,yyyy),quarter(qq,q),month(mm,m),dayofyear(dy,y),day(dd,d),week(wk,ww),weekday(dw),hour(hh), minute(mi,n), second(ss,s), millisecond(ms),例子:
select dateadd(month, -6, now());
select dateadd(month, 2, now());
(3)不支持 date_format 函数,它有三种代替方法:
A: 使用 datepart 代替:语法:datepart(datepart, date),返回代表日期的指定部分的整数,datepart可以为:year(yy,yyyy),quarter(qq,q),month(mm,m),dayofyear(dy,y),day(dd,d),week(wk,ww),weekday(dw),hour(hh), minute(mi,n),second(ss,s), millisecond(ms),例子:
select datepart(year, '2023-04-13 08:45:00'); --2023
select datepart(month, '2022-12-13 08:45:00'); --12
B: 使用 date_part 代替,功能和 datepart 一样,写法不同,参数顺序颠倒,且都要加引号,例子:
select date_part('2023-12-13 08:45:00', 'year');--2023
select date_part('2022-12-13 08:45:00', 'mm'); -- 12
C: 使用 extract 代替,语法:extract(dtfield from date),从日期类型date中抽取dtfield对应的值,dtfield 可以是 year,month,day,hour,minute,second,例子:
select extract(year from '2023-12-13 08:45:00'); --2023
select extract(month from '2022-12-13 08:45:00'); --12
(4)不支持 substring_index 函数, 使用 substr / substring 代替,语法:
substr(char[,m[,n]])
substring(char[from m[ for n]])
(5)不支持 group_concat 函数,使用 wm_concat 代替,例子:
select wm_concat(id) as idstr from persion ORDER BY id ;
(6)不支持 from_unixtime 函数,使用 round 代替,语法:
round(date[,format])
(7)不支持 case-when-then-else ,例如:
select case when id = 2 then "aaa" when id = 3 then "bbb" else "ccc" end as test from (select id from person) tt;
(8)current_timestamp 的返回值带有时区,例子:
select current_timestamp();
2023-04-37 14:34:18.433839 +08:00
r(yy,yyyy),quarter(qq,q),month(mm,m),dayofyear(dy,y),day(dd,d),week(wk,ww),weekday(dw),hour(hh), minute(mi,n), second(ss,s), millisecond(ms),例子:
select dateadd(month, -6, now());
select dateadd(month, 2, now());
(3)不支持 date_format 函数,它有三种代替方法:
A: 使用 datepart 代替:语法:datepart(datepart, date),返回代表日期的指定部分的整数,datepart可以为:year(yy,yyyy),quarter(qq,q),month(mm,m),dayofyear(dy,y),day(dd,d),week(wk,ww),weekday(dw),hour(hh), minute(mi,n),second(ss,s), millisecond(ms),例子:
select datepart(year, '2023-04-13 08:45:00'); --2023
select datepart(month, '2022-12-13 08:45:00'); --12
B: 使用 date_part 代替,功能和 datepart 一样,写法不同,参数顺序颠倒,且都要加引号,例子:
select date_part('2023-12-13 08:45:00', 'year');--2023
select date_part('2022-12-13 08:45:00', 'mm'); -- 12
C: 使用 extract 代替,语法:extract(dtfield from date),从日期类型date中抽取dtfield对应的值,dtfield 可以是 year,month,day,hour,minute,second,例子:
select extract(year from '2023-12-13 08:45:00'); --2023
select extract(month from '2022-12-13 08:45:00'); --12
(4)不支持 substring_index 函数, 使用 substr / substring 代替,语法:
substr(char[,m[,n]])
substring(char[from m[ for n]])
(5)不支持 group_concat 函数,使用 wm_concat 代替,例子:
select wm_concat(id) as idstr from persion ORDER BY id ;
(6)不支持 from_unixtime 函数,使用 round 代替,语法:
round(date[,format])
(7)不支持 case-when-then-else ,例如:
select case when id = 2 then "aaa" when id = 3 then "bbb" else "ccc" end as test from (select id from person) tt;
(8)current_timestamp 的返回值带有时区,例子:
select current_timestamp();
2023-04-37 14:34:18.433839 +08:00