Mybatis报错java.sql.SQLException: Column ‘IS_GENERATEDCOLUMN‘ not found

使用Mybatis的代码生成器报错

java.sql.SQLException: Column 'IS_GENERATEDCOLUMN' not found.

为什么会定义这个列？
这个值其实是数据库column的一个属性。

跟踪Mybatis源码，可以发现在类方法DatabaseIntrospector#getColumns中抛出异常，问题在 introspectedColumn.setGeneratedColumn("YES".equals(rs.getString("IS_GENERATEDCOLUMN"))); //$NON-NLS-1$ //$NON-NLS-2$, 对比1.3.4和1.4.0版本，后者对’IS_GENERATEDCOLUMN’做了判断

mybatis-generator-core1.3.4版本

while (rs.next()) {
            IntrospectedColumn introspectedColumn = ObjectFactory
                    .createIntrospectedColumn(context);

            introspectedColumn.setTableAlias(tc.getAlias());
            introspectedColumn.setJdbcType(rs.getInt("DATA_TYPE")); //$NON-NLS-1$
            introspectedColumn.setLength(rs.getInt("COLUMN_SIZE")); //$NON-NLS-1$
            introspectedColumn.setActualColumnName(rs.getString("COLUMN_NAME")); //$NON-NLS-1$
            introspectedColumn
                    .setNullable(rs.getInt("NULLABLE") == DatabaseMetaData.columnNullable); //$NON-NLS-1$
            introspectedColumn.setScale(rs.getInt("DECIMAL_DIGITS")); //$NON-NLS-1$
            introspectedColumn.setRemarks(rs.getString("REMARKS")); //$NON-NLS-1$
            introspectedColumn.setDefaultValue(rs.getString("COLUMN_DEF")); //$NON-NLS-1$
            
            introspectedColumn.setAutoIncrement("YES".equals(rs.getString("IS_AUTOINCREMENT"))); //$NON-NLS-1$ //$NON-NLS-2$
            introspectedColumn.setGeneratedColumn("YES".equals(rs.getString("IS_GENERATEDCOLUMN"))); //$NON-NLS-1$ //$NON-NLS-2$

            ActualTableName atn = new ActualTableName(
                    rs.getString("TABLE_CAT"), //$NON-NLS-1$
                    rs.getString("TABLE_SCHEM"), //$NON-NLS-1$
                    rs.getString("TABLE_NAME")); //$NON-NLS-1$

            List columns = answer.get(atn);
            if (columns == null) {
                columns = new ArrayList();
                answer.put(atn, columns);
            }

            columns.add(introspectedColumn);

            if (logger.isDebugEnabled()) {
                logger.debug(getString(
                        "Tracing.2", //$NON-NLS-1$
                        introspectedColumn.getActualColumnName(), Integer
                                .toString(introspectedColumn.getJdbcType()),
                        atn.toString()));
            }
        }

mybatis-generator-core1.4.0版本

ResultSetMetaData rsmd = rs.getMetaData();
        int colCount = rsmd.getColumnCount();
        for (int i = 1; i <= colCount; i++) {
            if ("IS_AUTOINCREMENT".equals(rsmd.getColumnName(i))) { //$NON-NLS-1$
                supportsIsAutoIncrement = true;
            }
            if ("IS_GENERATEDCOLUMN".equals(rsmd.getColumnName(i))) { //$NON-NLS-1$
                supportsIsGeneratedColumn = true;
            }
        }

        while (rs.next()) {
            IntrospectedColumn introspectedColumn = ObjectFactory
                    .createIntrospectedColumn(context);

            introspectedColumn.setTableAlias(tc.getAlias());
            introspectedColumn.setJdbcType(rs.getInt("DATA_TYPE")); //$NON-NLS-1$
            introspectedColumn.setActualTypeName(rs.getString("TYPE_NAME")); //$NON-NLS-1$
            introspectedColumn.setLength(rs.getInt("COLUMN_SIZE")); //$NON-NLS-1$
            introspectedColumn.setActualColumnName(rs.getString("COLUMN_NAME")); //$NON-NLS-1$
            introspectedColumn
                    .setNullable(rs.getInt("NULLABLE") == DatabaseMetaData.columnNullable); //$NON-NLS-1$
            introspectedColumn.setScale(rs.getInt("DECIMAL_DIGITS")); //$NON-NLS-1$
            introspectedColumn.setRemarks(rs.getString("REMARKS")); //$NON-NLS-1$
            introspectedColumn.setDefaultValue(rs.getString("COLUMN_DEF")); //$NON-NLS-1$

            if (supportsIsAutoIncrement) {
                introspectedColumn.setAutoIncrement(
                        "YES".equals(rs.getString("IS_AUTOINCREMENT"))); //$NON-NLS-1$ //$NON-NLS-2$
            }

            if (supportsIsGeneratedColumn) {
                introspectedColumn.setGeneratedColumn(
                        "YES".equals(rs.getString("IS_GENERATEDCOLUMN"))); //$NON-NLS-1$ //$NON-NLS-2$
            }

            ActualTableName atn = new ActualTableName(
                    rs.getString("TABLE_CAT"), //$NON-NLS-1$
                    rs.getString("TABLE_SCHEM"), //$NON-NLS-1$
                    rs.getString("TABLE_NAME")); //$NON-NLS-1$

            List columns = answer.get(atn);
            if (columns == null) {
                columns = new ArrayList<>();
                answer.put(atn, columns);
            }

            columns.add(introspectedColumn);

            if (logger.isDebugEnabled()) {
                logger.debug(getString(
                        "Tracing.2", //$NON-NLS-1$
                        introspectedColumn.getActualColumnName(), Integer
                                .toString(introspectedColumn.getJdbcType()),
                        atn.toString()));
            }
        }

最后，升级mybatis-generator-core版本后，修复问题