MySql之自动同步表结构
MySql之自动同步表结构开发痛点
而由于这些修改数据库的操作可能由多个rd操作,很难一次性收集全。人手工去和qa环境对字段又特别繁琐,容易遗漏。
解决之道
原理同步新增的表
用到的sql主要有:
show table from rd_db;show create table added_table_name;同步表结构
用到的sql有:
select COLUMN_NAME,COLUMN_TYPE,IS_NULLABLE,COLUMN_DEFAULT,COLUMN_COMMENT,EXTRA from information_schema.columnswhere TABLE_SCHEMA='rd_db' and TABLE_NAME = 'rd_table';
for (Column column : sourceTable.getColumns().values()) { if(targetTable.getColumns().get(column.getName()) == null) { // 如果对应的target没有这个字段,直接alter String sql = "alter table " + target.getSchema() + "." + targetTable.getTableName() + " add "+ column .getName() + " "; sql += column.getType() + " "; if(column.getIsNull().equals("NO")) { sql += "NOT NULL "; } else { sql += "NULL "; } if (column.getDefaultValue() != null) { sql += "DEFAULT " + SqlUtil.getDbString(column.getDefaultValue()) + " "; } if (column.getComment() != null) { sql += "COMMENT " + SqlUtil.getDbString(column.getComment()) + " "; } if(after != null) { sql += "after " + after; } changeSql.add(sql+";"); } else{ // 检查对应的source 和 target的属性 String sql = "alter table " + target.getSchema() + "." + targetTable.getTableName() + " change " + column .getName() + " "; Column sourceColumn = column; Column targetColumn = targetTable.getColumns().get(sourceColumn.getName()); // 比较两者字段,如果返回null,表明一致 String sqlExtend = compareSingleColumn(sourceColumn, targetColumn); if (sqlExtend != null) { changeSql.add(sql + sqlExtend+";"); } } after = column.getName(); }同步索引结构
配置sourceHost=127.0.0.1:3306sourceUser=rootsourcePass=123123123sourceSchema=mystique_dbsourceCharset=utf8targetHost=127.0.0.1:3306targetUser=roottargetPass=123123123targetSchema=mystique_testtargetCharset=utf8autoExecute=YES //此处表明自动同步运行
用IDE打开,找到
alchemystar.runner.ShellRunner
生成效果展示alter table mystique_test.t_test_3 change id id bigint(20) NOT NULL AUTO_INCREMENT COMMENT ''alter table mystique_test.t_test_3 add index (name)alter table mystique_test.t_test_3 dropindex name_idalter table mystique_test.t_test_3 add id_2 varchar(50) NULL DEFAULT '' COMMENT '' aftername