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AST是abstract syntax tree的缩写,也就是抽象语法树。和所有的Parser一样,Druid Parser会生成一个抽象语法树。
在Druid中,AST节点类型主要包括SQLObject、SQLExpr、SQLStatement三种抽象类型。
package com.alibaba.druid.sql.ast; public interface SQLObject {} public interface SQLExpr extends SQLObject {} public interface SQLStatement {}