use of com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock in project druid by alibaba.
the class PagerUtils method clearOrderBy.
private static void clearOrderBy(SQLSelectQuery query) {
if (query instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) query;
if (queryBlock instanceof MySqlSelectQueryBlock) {
MySqlSelectQueryBlock mysqlQueryBlock = (MySqlSelectQueryBlock) queryBlock;
if (mysqlQueryBlock.getOrderBy() != null) {
mysqlQueryBlock.setOrderBy(null);
}
} else if (queryBlock instanceof PGSelectQueryBlock) {
PGSelectQueryBlock pgQueryBlock = (PGSelectQueryBlock) queryBlock;
if (pgQueryBlock.getOrderBy() != null) {
pgQueryBlock.setOrderBy(null);
}
}
return;
}
if (query instanceof SQLUnionQuery) {
SQLUnionQuery union = (SQLUnionQuery) query;
if (union.getOrderBy() != null) {
union.setOrderBy(null);
}
clearOrderBy(union.getLeft());
clearOrderBy(union.getRight());
}
}
use of com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock in project druid by alibaba.
the class PagerUtils method getLimit.
/**
*
* @param sql
* @param dbType
* @return if not exists limit, return -1;
*/
public static int getLimit(String sql, String dbType) {
List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, dbType);
if (stmtList.size() != 1) {
return -1;
}
SQLStatement stmt = stmtList.get(0);
if (stmt instanceof SQLSelectStatement) {
SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
SQLSelectQuery query = selectStmt.getSelect().getQuery();
if (query instanceof SQLSelectQueryBlock) {
if (query instanceof MySqlSelectQueryBlock) {
SQLLimit limit = ((MySqlSelectQueryBlock) query).getLimit();
if (limit == null) {
return -1;
}
SQLExpr rowCountExpr = limit.getRowCount();
if (rowCountExpr instanceof SQLNumericLiteralExpr) {
int rowCount = ((SQLNumericLiteralExpr) rowCountExpr).getNumber().intValue();
return rowCount;
}
return Integer.MAX_VALUE;
}
if (query instanceof OdpsSelectQueryBlock) {
SQLLimit limit = ((OdpsSelectQueryBlock) query).getLimit();
SQLExpr rowCountExpr = limit != null ? limit.getRowCount() : null;
if (rowCountExpr instanceof SQLNumericLiteralExpr) {
int rowCount = ((SQLNumericLiteralExpr) rowCountExpr).getNumber().intValue();
return rowCount;
}
return Integer.MAX_VALUE;
}
return -1;
}
}
return -1;
}
use of com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock in project Mycat_plus by coderczp.
the class DruidSelectOracleParser method statementParse.
@Override
public void statementParse(SchemaConfig schema, RouteResultset rrs, SQLStatement stmt) {
SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
SQLSelectQuery sqlSelectQuery = selectStmt.getSelect().getQuery();
// 从mysql解析过来
if (sqlSelectQuery instanceof MySqlSelectQueryBlock) {
MySqlSelectQueryBlock mysqlSelectQuery = (MySqlSelectQueryBlock) selectStmt.getSelect().getQuery();
Limit limit = mysqlSelectQuery.getLimit();
if (limit == null) {
// 使用oracle的解析,否则会有部分oracle语法识别错误
OracleStatementParser oracleParser = new OracleStatementParser(getCtx().getSql());
SQLSelectStatement oracleStmt = (SQLSelectStatement) oracleParser.parseStatement();
selectStmt = oracleStmt;
SQLSelectQuery oracleSqlSelectQuery = oracleStmt.getSelect().getQuery();
if (oracleSqlSelectQuery instanceof OracleSelectQueryBlock) {
parseNativePageSql(oracleStmt, rrs, (OracleSelectQueryBlock) oracleSqlSelectQuery, schema);
}
}
if (isNeedParseOrderAgg) {
parseOrderAggGroupMysql(schema, selectStmt, rrs, mysqlSelectQuery);
// 更改canRunInReadDB属性
if ((mysqlSelectQuery.isForUpdate() || mysqlSelectQuery.isLockInShareMode()) && rrs.isAutocommit() == false) {
rrs.setCanRunInReadDB(false);
}
}
}
}
use of com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock in project Mycat_plus by coderczp.
the class DruidSelectParser method changeSql.
/**
* 改写sql:需要加limit的加上
*/
@Override
public void changeSql(SchemaConfig schema, RouteResultset rrs, SQLStatement stmt, LayerCachePool cachePool) throws SQLNonTransientException {
tryRoute(schema, rrs, cachePool);
rrs.copyLimitToNodes();
SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
SQLSelectQuery sqlSelectQuery = selectStmt.getSelect().getQuery();
if (sqlSelectQuery instanceof MySqlSelectQueryBlock) {
MySqlSelectQueryBlock mysqlSelectQuery = (MySqlSelectQueryBlock) selectStmt.getSelect().getQuery();
int limitStart = 0;
int limitSize = schema.getDefaultMaxLimit();
// clear group having
SQLSelectGroupByClause groupByClause = mysqlSelectQuery.getGroupBy();
// Modified by winbill, 20160614, do NOT include having clause when routing to multiple nodes
if (groupByClause != null && groupByClause.getHaving() != null && isRoutMultiNode(schema, rrs)) {
groupByClause.setHaving(null);
}
Map<String, Map<String, Set<ColumnRoutePair>>> allConditions = getAllConditions();
boolean isNeedAddLimit = isNeedAddLimit(schema, rrs, mysqlSelectQuery, allConditions);
if (isNeedAddLimit) {
Limit limit = new Limit();
limit.setRowCount(new SQLIntegerExpr(limitSize));
mysqlSelectQuery.setLimit(limit);
rrs.setLimitSize(limitSize);
String sql = getSql(rrs, stmt, isNeedAddLimit);
rrs.changeNodeSqlAfterAddLimit(schema, getCurentDbType(), sql, 0, limitSize, true);
}
Limit limit = mysqlSelectQuery.getLimit();
if (limit != null && !isNeedAddLimit) {
SQLIntegerExpr offset = (SQLIntegerExpr) limit.getOffset();
SQLIntegerExpr count = (SQLIntegerExpr) limit.getRowCount();
if (offset != null) {
limitStart = offset.getNumber().intValue();
rrs.setLimitStart(limitStart);
}
if (count != null) {
limitSize = count.getNumber().intValue();
rrs.setLimitSize(limitSize);
}
if (isNeedChangeLimit(rrs)) {
Limit changedLimit = new Limit();
changedLimit.setRowCount(new SQLIntegerExpr(limitStart + limitSize));
if (offset != null) {
if (limitStart < 0) {
String msg = "You have an error in your SQL syntax; check the manual that " + "corresponds to your MySQL server version for the right syntax to use near '" + limitStart + "'";
throw new SQLNonTransientException(ErrorCode.ER_PARSE_ERROR + " - " + msg);
} else {
changedLimit.setOffset(new SQLIntegerExpr(0));
}
}
mysqlSelectQuery.setLimit(changedLimit);
String sql = getSql(rrs, stmt, isNeedAddLimit);
rrs.changeNodeSqlAfterAddLimit(schema, getCurentDbType(), sql, 0, limitStart + limitSize, true);
// 设置改写后的sql
ctx.setSql(sql);
} else {
rrs.changeNodeSqlAfterAddLimit(schema, getCurentDbType(), getCtx().getSql(), rrs.getLimitStart(), rrs.getLimitSize(), true);
// ctx.setSql(nativeSql);
}
}
if (rrs.isDistTable()) {
SQLTableSource from = mysqlSelectQuery.getFrom();
for (RouteResultsetNode node : rrs.getNodes()) {
SQLIdentifierExpr sqlIdentifierExpr = new SQLIdentifierExpr();
sqlIdentifierExpr.setParent(from);
sqlIdentifierExpr.setName(node.getSubTableName());
SQLExprTableSource from2 = new SQLExprTableSource(sqlIdentifierExpr);
from2.setAlias(from.getAlias());
mysqlSelectQuery.setFrom(from2);
node.setStatement(stmt.toString());
}
}
rrs.setCacheAble(isNeedCache(schema, rrs, mysqlSelectQuery, allConditions));
}
}
use of com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock in project Mycat_plus by coderczp.
the class DruidSelectSqlServerParser method statementParse.
@Override
public void statementParse(SchemaConfig schema, RouteResultset rrs, SQLStatement stmt) {
SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
SQLSelectQuery sqlSelectQuery = selectStmt.getSelect().getQuery();
// 从mysql解析过来
if (sqlSelectQuery instanceof MySqlSelectQueryBlock) {
MySqlSelectQueryBlock mysqlSelectQuery = (MySqlSelectQueryBlock) selectStmt.getSelect().getQuery();
MySqlSelectQueryBlock.Limit limit = mysqlSelectQuery.getLimit();
if (limit == null) {
sqlserverParse(schema, rrs);
}
if (isNeedParseOrderAgg) {
parseOrderAggGroupMysql(schema, stmt, rrs, mysqlSelectQuery);
// 更改canRunInReadDB属性
if ((mysqlSelectQuery.isForUpdate() || mysqlSelectQuery.isLockInShareMode()) && rrs.isAutocommit() == false) {
rrs.setCanRunInReadDB(false);
}
}
}
}
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