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更改CacheDB的Column查询方式为SQL

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更改CacheDB的Column查询方式为SQL
This commit is contained in:
smallbun
2020-08-26 19:10:47 +08:00
committed by Gitee
parent 636d0ace6a 2cb65c3fe4
commit 1995f9cbba
1 changed files with 59 additions and 4 deletions
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59
screw-core/src/main/java/cn/smallbun/screw/core/query/cachedb/CacheDbDataBaseQuery.java
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@@ -29,20 +29,24 @@ import cn.smallbun.screw.core.query.cachedb.model.CacheDbDatabaseModel;
import cn.smallbun.screw.core.query.cachedb.model.CacheDbPrimaryKeyModel;
import cn.smallbun.screw.core.query.cachedb.model.CacheDbTableModel;
import cn.smallbun.screw.core.util.Assert;
import cn.smallbun.screw.core.util.CollectionUtils;
import cn.smallbun.screw.core.util.ExceptionUtils;
import cn.smallbun.screw.core.util.JdbcUtils;
import javax.sql.DataSource;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.util.List;
import java.util.stream.Collectors;
import static cn.smallbun.screw.core.constant.DefaultConstants.PERCENT_SIGN;
/**
* CacheDB 数据库查询
*
* @author <a href ='jxh98@foxmail.com'>Josway</a> 2020/6/28
* @author <a href ='jxh98@foxmail.com'>Josway</a> 2020/8/26
* @since JDK 1.8
*/
public class CacheDbDataBaseQuery extends AbstractDatabaseQuery {
@@ -107,7 +111,58 @@ public class CacheDbDataBaseQuery extends AbstractDatabaseQuery {
//查询
resultSet = getMetaData().getColumns(getCatalog(), getSchema(), table, PERCENT_SIGN);
//映射
return Mapping.convertList(resultSet, CacheDbColumnModel.class);
final List<CacheDbColumnModel> list = Mapping.convertList(resultSet, CacheDbColumnModel.class);
//这里处理是为了如果是查询全部列呢？所以处理并获取唯一表名
List<String> tableNames = list.stream().map(CacheDbColumnModel::getTableName)
.collect(Collectors.toList()).stream().distinct().collect(Collectors.toList());
if (CollectionUtils.isEmpty(columnsCaching)) {
//查询全部
if (table.equals(PERCENT_SIGN)) {
//获取全部表列信息SQL
String sql = MessageFormat.format("select TABLE_NAME as \"TABLE_NAME\",COLUMN_NAME as \"COLUMN_NAME\"," +
"case when CHARACTER_MAXIMUM_LENGTH is null then DATA_TYPE || '''' " +
"else DATA_TYPE || ''(''||CHARACTER_MAXIMUM_LENGTH ||'')'' end as \"COLUMN_TYPE\" " +
"from INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = ''{0}''",
getSchema());
PreparedStatement statement = prepareStatement(sql);
resultSet = statement.executeQuery();
int fetchSize = 4284;
if (resultSet.getFetchSize() < fetchSize) {
resultSet.setFetchSize(fetchSize);
}
}
//单表查询
else {
//获取表列信息SQL 查询表名、列名、说明、数据类型
String sql = MessageFormat.format("select TABLE_NAME as \"TABLE_NAME\",COLUMN_NAME as \"COLUMN_NAME\"," +
"case when CHARACTER_MAXIMUM_LENGTH is null then DATA_TYPE || ''''" +
"else DATA_TYPE || ''(''||CHARACTER_MAXIMUM_LENGTH ||'')'' end as \"COLUMN_TYPE\" " +
"from INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = ''{0}'' and TABLE_NAME = " +
"''{1}''",
getSchema(), table);
resultSet = prepareStatement(sql).executeQuery();
}
List<CacheDbColumnModel> inquires = Mapping.convertList(resultSet,
CacheDbColumnModel.class);
//处理列，表名为key，列名为值
tableNames.forEach(name -> columnsCaching.put(name, inquires.stream()
.filter(i -> i.getTableName().equals(name)).collect(Collectors.toList())));
}
//处理备注信息
list.forEach(i -> {
//从缓存中根据表名获取列信息
List<Column> columns = columnsCaching.get(i.getTableName());
columns.forEach(j -> {
//列名表名一致
if (i.getColumnName().equals(j.getColumnName())
&& i.getTableName().equals(j.getTableName())) {
//放入列类型
i.setColumnType(j.getColumnType());
i.setColumnLength(j.getColumnLength());
}
});
});
return list;
} catch (SQLException e) {
throw ExceptionUtils.mpe(e);
} finally {