参考：https://gitee.com/baomidou/mybatis-plus-samples/tree/master/mybatis-plus-sample-deluxe

    定义Mapper

    1. public class CommonMapper<T> extends BaseMapper<T> {
    2.     int insertIgnore(T t);
    3. }

    使用AbstractMethod定义CommonMapper中insertIgnore方法的实现：

    1. public class InsertIgnore extends AbstractMethod {
    2.     @Override
    3.     public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
    4.         String sql = "insert ignore into %s %s values %s";
    5.         StringBuilder fieldSql = new StringBuilder();
    6.         fieldSql.append(tableInfo.getKeyColumn()).append(",");
    7.         StringBuilder valueSql = new StringBuilder();
    8.         valueSql.append("#{").append(tableInfo.getKeyProperty()).append("},");
    9.         tableInfo.getFieldList().forEach(x -> {
    10.             fieldSql.append(x.getColumn()).append(",");
    11.             valueSql.append("#{").append(x.getProperty()).append("},");
    12.         });
    13.         fieldSql.delete(fieldSql.length() - 1, fieldSql.length());
    14.         fieldSql.insert(0, "(");
    15.         fieldSql.append(")");
    16.         valueSql.insert(0, "(");
    17.         valueSql.delete(valueSql.length() - 1, valueSql.length());
    18.         valueSql.append(")");
    19.         SqlSource sqlSource = languageDriver.createSqlSource(configuration, String.format(sql, tableInfo.getTableName(), fieldSql.toString(), valueSql.toString()), modelClass);
    20.         return this.addInsertMappedStatement(mapperClass, modelClass, "insertIgnore", sqlSource, new NoKeyGenerator(), null, null);
    21.     }
    22. }

    定义sql注入器,将定义的InsertIgnore方法的实现添加到注入器中的方法列表中

    1. public class CommonSqlInjector extends DefaultSqlInjector {
    2.     @Override
    3.     public List<AbstractMethod> getMethodList() {
    4.         List<AbstractMethod> methodList = super.getMethodList();
    5.         // 
    6.         methodList.add(new InsertIgnore());
    7.         return methodList;
    8.     }
    9. }

    配置注入器，使得注入器生效

    1. @Configuration
    2. public class MyBatisPlusConfig {
    3.     @Bean
    4.     public CommonSqlInjector commonSqlInjector() {
    5.         return new CommonSqlInjector();
    6.     }
    7. }

    此时，CommonMapper方法可以正常使用了,
    可以在需要实现insertIgore时可以用CommonMapper替换BaseMapper