package com.alibaba.druid.mapping.spi;
import java.util.List;
import com.alibaba.druid.mapping.MappingEngine;
import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDeleteStatement;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
import com.alibaba.druid.sql.dialect.mysql.parser.MySqlSelectParser;
import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
public class MySqlMappingProvider implements MappingProvider {
@Override
public MappingVisitor createMappingVisitor(MappingEngine engine) {
return new MySqlMappingVisitor(engine.getEntities());
}
@Override
public SQLASTOutputVisitor createOutputVisitor(MappingEngine engine, Appendable out) {
return new MySqlOutputVisitor(out);
}
public SQLSelectQueryBlock explainToSelectSQLObject(MappingEngine engine, String sql) {
MySqlSelectParser selectParser = new MySqlSelectParser(sql);
MySqlSelectQueryBlock query = (MySqlSelectQueryBlock) selectParser.query();
Integer maxLimit = engine.getMaxLimit();
if (maxLimit != null) {
if (query.getLimit() == null) {
Limit limit = new Limit();
limit.setRowCount(new SQLIntegerExpr(maxLimit));
query.setLimit(limit);
} else {
SQLNumericLiteralExpr rowCountExpr = (SQLNumericLiteralExpr) query.getLimit().getRowCount();
int rowCount = rowCountExpr.getNumber().intValue();
if (rowCount > maxLimit.intValue()) {
rowCountExpr.setNumber(maxLimit);
}
}
}
return query;
}
public MySqlDeleteStatement explainToDeleteSQLObject(MappingEngine engine, String sql) {
MySqlStatementParser parser = new MySqlStatementParser(sql);
MySqlDeleteStatement stmt = parser.parseDeleteStatement();
MappingVisitorUtils.setDataSource(engine, stmt);
return stmt;
}
public SQLUpdateStatement explainToUpdateSQLObject(MappingEngine engine, String sql) {
MySqlStatementParser parser = new MySqlStatementParser(sql);
SQLUpdateStatement stmt = parser.parseUpdateStatement();
MappingVisitorUtils.setDataSource(engine, stmt);
return stmt;
}
public SQLInsertStatement explainToInsertSQLObject(MappingEngine engine, String sql) {
MySqlStatementParser parser = new MySqlStatementParser(sql);
SQLInsertStatement stmt = (SQLInsertStatement) parser.parseInsert();
MappingVisitorUtils.setDataSource(engine, stmt);
return stmt;
}
@Override
public ExportParameterVisitor createExportParameterVisitor(List<Object> parameters) {
return new MySqlExportParameterVisitor(parameters);
}
}