目录

• 1、背景：Mybatis generator根据数据库表自动生成POJO类完整解决方案
• 2、解决方案：mybatis generator 1.3.6 已经有了这个功能，
• • 2.1、增加了一个新的属性：
  • 2.2、具体配置，在generatreConfig.xml, 例如:
• 3、一定要开始看源码，非常锻炼编程能力

1、背景：Mybatis generator根据数据库表自动生成POJO类完整解决方案

在用Mybatis generator 生成可以用来访问（多个）表的基础对象，遇到一个问题，就是columnRenamingRule可以替换所有表元素里字段前缀

但是如果想去掉所有表的前缀，比如有多个表：

sys_user
sys_city
sys_order

期望得到的POJO结果是：

User
City
Order

2、解决方案：mybatis generator 1.3.6 已经有了这个功能，

2.1、增加了一个新的属性：

domainObjectRenamingRule

2.2、具体配置，在generatreConfig.xml, 例如:

参照：
https://github.com/mybatis/generator/issues/275
https://github.com/mybatis/generator/pull/176

我们在解决一些问题，要学会查看源码，发现已经有了这个属性：

FullyQualifiedTable.java

  core/mybatis-generator-core/src/main/java/org/mybatis/generator/api/FullyQualifiedTable.java@@ -23,6 +23,10 @@import static org.mybatis.generator.internal.util.StringUtility.stringHasValue;import org.mybatis.generator.config.Context;+import org.mybatis.generator.config.DomainObjectRenamingRule;++import java.util.regex.Matcher;+import java.util.regex.Pattern;/*** The Class FullyQualifiedTable.@@ -43,6 +47,7 @@private boolean ignoreQualifiersAtRuntime;private String beginningDelimiter;private String endingDelimiter;+    private DomainObjectRenamingRule domainObjectRenamingRule;/*** This object is used to hold information related to the table itself, not the columns in the@@ -82,6 +87,9 @@* @param delimitIdentifiers*            if true, then the table identifiers will be delimited at runtime. The delimiter characters are*            obtained from the Context.+     * @param domainObjectRenamingRule+     *            If domainObjectName is not configured, we'll build the domain object named based on the tableName or runtimeTableName.+     *            And then we use the domain object renameing rule to generate the final domain object name.* @param context*            the context*/@@ -90,7 +98,8 @@ public FullyQualifiedTable(String introspectedCatalog,String domainObjectName, String alias,boolean ignoreQualifiersAtRuntime, String runtimeCatalog,String runtimeSchema, String runtimeTableName,-            boolean delimitIdentifiers, Context context) {+            boolean delimitIdentifiers, DomainObjectRenamingRule domainObjectRenamingRule,+            Context context) {super();this.introspectedCatalog = introspectedCatalog;this.introspectedSchema = introspectedSchema;@@ -99,6 +108,7 @@ public FullyQualifiedTable(String introspectedCatalog,this.runtimeCatalog = runtimeCatalog;this.runtimeSchema = runtimeSchema;this.runtimeTableName = runtimeTableName;+        this.domainObjectRenamingRule = domainObjectRenamingRule;if (stringHasValue(domainObjectName)) {int index = domainObjectName.lastIndexOf('.');@@ -238,11 +248,21 @@ public String getIbatis2SqlMapNamespace() {public String getDomainObjectName() {if (stringHasValue(domainObjectName)) {return domainObjectName;-        } else if (stringHasValue(runtimeTableName)) {-            return getCamelCaseString(runtimeTableName, true);+        }+        String finalDomainObjectName;+        if (stringHasValue(runtimeTableName)) {+            finalDomainObjectName =  getCamelCaseString(runtimeTableName, true);} else {-            return getCamelCaseString(introspectedTableName, true);+            finalDomainObjectName =  getCamelCaseString(introspectedTableName, true);+        }+        if(domainObjectRenamingRule != null){+            Pattern pattern = Pattern.compile(domainObjectRenamingRule.getSearchString());+            String replaceString = domainObjectRenamingRule.getReplaceString();+            replaceString = replaceString == null ? "" : replaceString;+            Matcher matcher = pattern.matcher(finalDomainObjectName);+            finalDomainObjectName = matcher.replaceAll(replaceString);}+        return finalDomainObjectName;}/* (non-Javadoc)@@ -304,7 +324,7 @@ public String getAlias() {* Calculates a Java package fragment based on the table catalog and schema.* If qualifiers are ignored, then this method will return an empty string.* -     * 
This method is used for determining the sub package for Java client and +     * 
This method is used for determining the sub package for Java client and

…s-generator-core/src/main/java/org/mybatis/generator/config/DomainObjectRenamingRule.java

package org.mybatis.generator.config;++import org.mybatis.generator.api.dom.xml.Attribute;+import org.mybatis.generator.api.dom.xml.XmlElement;++import java.util.List;++import static org.mybatis.generator.internal.util.StringUtility.stringHasValue;+import static org.mybatis.generator.internal.ut`这里写代码片`il.messages.Messages.getString;++/**+ * This class is used to specify a renaming rule for table's domain object name.+ * If domainObjectName is not configured, we'll build the domain object named+ * based on the tableName or runtimeTableName. And then we use the domain object+ * renameing rule to generate the final domain object name.+ * + * For example, if some tables are named:+ * + * 
+ * 
SYS_USER
+ * 
SYS_ROLE
+ * 
SYS_FUNCTIONS
+ * 
+ * + * it might be annoying to have the generated domain name all containing the SYS+ * prefix. This class can be used to remove the prefix by specifying+ * + * 
+ * 
searchString="^Sys"
+ * 
replaceString=""
+ * 
+ * + * Note that internally, the generator uses the+ * java.util.regex.Matcher.replaceAll method for this function. See+ * the documentation of that method for example of the regular expression+ * language used in Java.+ * + * @author liuzh+ * + */+public class DomainObjectRenamingRule {+    private String searchString;+    private String replaceString;++    public String getReplaceString() {+        return replaceString;+    }++    public void setReplaceString(String replaceString) {+        this.replaceString = replaceString;+    }++    public String getSearchString() {+        return searchString;+    }++    public void setSearchString(String searchString) {+        this.searchString = searchString;+    }++    public void validate(List errors, String tableName) {+        if (!stringHasValue(searchString)) {+            errors.add(getString("ValidationError.28", tableName)); //$NON-NLS-1$+        }+    }++    public XmlElement toXmlElement() {+        XmlElement xmlElement = new XmlElement("domainRenamingRule"); //$NON-NLS-1$+        xmlElement.addAttribute(new Attribute("searchString", searchString)); //$NON-NLS-1$++        if (replaceString != null) {+            xmlElement.addAttribute(new Attribute(+                    "replaceString", replaceString)); //$NON-NLS-1$+        }++        return xmlElement;+    }+}

.mybatis-generator-core/src/main/java/org/mybatis/generator/config/TableConfiguration.j

      private boolean delimitIdentifiers;+    private DomainObjectRenamingRule domainObjectRenamingRule;+private ColumnRenamingRule columnRenamingRule;private boolean isAllColumnDelimitingEnabled;@@ -462,6 +464,10 @@ public XmlElement toXmlElement() {xmlElement.addElement(generatedKey.toXmlElement());}+        if (domainObjectRenamingRule != null) {+            xmlElement.addElement(domainObjectRenamingRule.toXmlElement());+        }+if (columnRenamingRule != null) {xmlElement.addElement(columnRenamingRule.toXmlElement());}@@ -544,6 +550,10 @@ public void validate(List errors, int listPosition) {}}+        if (domainObjectRenamingRule != null) {+            domainObjectRenamingRule.validate(errors, fqTableName);+        }+if (columnRenamingRule != null) {columnRenamingRule.validate(errors, fqTableName);}@@ -561,6 +571,14 @@ public void validate(List errors, int listPosition) {}}+    public DomainObjectRenamingRule getDomainObjectRenamingRule() {+        return domainObjectRenamingRule;+    }++    public void setDomainObjectRenamingRule(DomainObjectRenamingRule domainObjectRenamingRule) {+        this.domainObjectRenamingRule = domainObjectRenamingRule;+    }+public ColumnRenamingRule getColumnRenamingRule() {return columnRenamingRule;}

3、一定要开始看源码，非常锻炼编程能力

参照：https://github.com/mybatis/generator/commit/9194d749943d0c6b4372f27bb87e65749d43cb4c
https://github.com/mybatis/generator

你看过框架的源码吗？我们做个投票了解一下