sqlParser 处理SQL(增删改查) 替换schema 用于多租户代码,Java代码库,德仔网

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【Java】 sqlParser 处理SQL(增删改查) 替换schema 用于多租户
作者:嘉诚 / 发布于2021/4/25/ 356
sqlparser maven地址如下：

<dependency>
? ? ? ? ? ? <groupId>com.github.jsqlparser</groupId>
? ? ? ? ? ? <artifactId>jsqlparser</artifactId>
? ? ? ? ? ? <version>0.9.5</version>
? </dependency>??





import java.io.StringReader;
import java.util.List;
 
 
import net.sf.jsqlparser.JSQLParserException;
import net.sf.jsqlparser.expression.Alias;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.ExpressionVisitor;
import net.sf.jsqlparser.expression.operators.relational.InExpression;
import net.sf.jsqlparser.expression.operators.relational.ItemsList;
import net.sf.jsqlparser.parser.CCJSqlParserManager;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.delete.Delete;
import net.sf.jsqlparser.statement.insert.Insert;
import net.sf.jsqlparser.statement.select.FromItem;
import net.sf.jsqlparser.statement.select.Join;
import net.sf.jsqlparser.statement.select.Pivot;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectBody;
import net.sf.jsqlparser.statement.select.SubSelect;
import net.sf.jsqlparser.statement.update.Update;
import net.sf.jsqlparser.util.deparser.ExpressionDeParser;
import net.sf.jsqlparser.util.deparser.SelectDeParser;
import net.sf.jsqlparser.util.deparser.UpdateDeParser;
 
 
/**
 * @
 * @author Administrator
 * 
 */
 
 
public class SqlParserUtil extends SelectDeParser {
	private String schemaName;
 
 
	public SqlParserUtil(ExpressionVisitor expressionVisitor,
			StringBuilder buffer) {
		super(expressionVisitor, buffer);
	}
 
 
	public String getSchemaName() {
		return schemaName;
	}
 
 
	public void setSchemaName(String schemaName) {
		this.schemaName = schemaName;
	}
 
 
	public void visit(Table tableName) {
		tableName.setSchemaName(schemaName);
		StringBuilder buffer = getBuffer();
		buffer.append(tableName.getFullyQualifiedName());
		Pivot pivot = tableName.getPivot();
		if (pivot != null) {
			pivot.accept(this);
		}
		Alias alias = tableName.getAlias();
		if (alias != null) {
			buffer.append(alias);
		}
	}
 
 
	public static String sqlParserForSelect(String sql, String schemaName) {
		Select select;
		StringBuilder buffer = new StringBuilder();
		try {
			select = (Select) CCJSqlParserUtil.parse(sql);
			ExpressionDeParser expressionDeParser = new ExpressionDeParser();
			SqlParserUtil deparser = new SqlParserUtil(expressionDeParser,
					buffer);
			deparser.setSchemaName(schemaName);
			expressionDeParser.setSelectVisitor(deparser);
			expressionDeParser.setBuffer(buffer);
			select.getSelectBody().accept(deparser);
			System.out.println(buffer.toString());
		} catch (JSQLParserException e) {
			e.printStackTrace();
		}
 
 
		return buffer.toString();
	}
 
 
	public static String sqlParserForInsert(String sql, String schemaName) {
		StringBuilder buffer = new StringBuilder();
		Insert Statement = null;
		try {
			CCJSqlParserManager parser = new CCJSqlParserManager();
			Statement stmt = parser.parse(new StringReader(sql));
			Statement = (Insert) stmt;
 
 
			Table t = Statement.getTable();
			t.setSchemaName(schemaName);
			Statement.setTable(t);
 
 
			Select select = Statement.getSelect();
			if (select != null) {
				ExpressionDeParser expressionDeParser = new ExpressionDeParser();
				SqlParserUtil deparser = new SqlParserUtil(expressionDeParser,
						buffer);
				deparser.setSchemaName(schemaName);
				expressionDeParser.setSelectVisitor(deparser);
				expressionDeParser.setBuffer(buffer);
				select.getSelectBody().accept(deparser);
			}
			System.out.println(Statement.toString());
		} catch (JSQLParserException e) {
			e.printStackTrace();
		}
		return Statement.toString();
 
 
	}
 
 
	/**
	 * 
	 * @param sql
	 * @param schemaName
	 * @return
	 */
	public static String sqlParserForUpdate(String sql, String schemaName) {
		StringBuilder buffer = new StringBuilder();
		Update Statement = null;
		try {
			CCJSqlParserManager parser = new CCJSqlParserManager();
			Statement stmt = parser.parse(new StringReader(sql));
			Statement = (Update) stmt;
 
 
			List list = Statement.getTables();
			for (Object object : list) {
				Table t = (Table) object;
				t.setSchemaName(schemaName);
			}
			Statement.setTables((List<Table>) list);
 
 
			// 处理from
			FromItem fromItem = Statement.getFromItem();
			if (fromItem != null) {
				Table t = (Table) fromItem;
				t.setSchemaName(schemaName);
 
 
			}
 
 
			// 处理join
			List<Join> joins = Statement.getJoins();
			if (joins != null && joins.size() > 0) {
				for (Object object : joins) {
					Join t = (Join) object;
					Table rightItem = (Table) t.getRightItem();
					rightItem.setSchemaName(schemaName);
					System.out.println();
				}
			}
 
 
			ExpressionDeParser expressionDeParser = new ExpressionDeParser();
			UpdateDeParser p = new UpdateDeParser(expressionDeParser, null,
					buffer);
			expressionDeParser.setBuffer(buffer);
			p.deParse(Statement);
		} catch (JSQLParserException e) {
			e.printStackTrace();
		}
		return Statement.toString();
 
 
	}
 
 
	public static String sqlParserForDelete(String sql, String schemaName) {
		Delete Statement = null;
		try {
			CCJSqlParserManager parser = new CCJSqlParserManager();
			Statement stmt = parser.parse(new StringReader(sql));
			Statement = (Delete) stmt;
 
 
			Table t = Statement.getTable();
			t.setSchemaName(schemaName);
			Statement.setTable(t);
 
 
			Expression where = Statement.getWhere();
			InExpression getRightItems = null;
			if (where != null) {
				getRightItems = (InExpression) where;
				ItemsList rightItemsList = getRightItems.getRightItemsList();
				if (rightItemsList instanceof SubSelect) {
					SubSelect s = (SubSelect) rightItemsList;
					SelectBody selectBody = s.getSelectBody();
					Select se = (Select) CCJSqlParserUtil.parse(selectBody
							.toString());
 
 
					StringBuilder buffer = new StringBuilder();
					ExpressionDeParser expressionDeParser = new ExpressionDeParser();
					SqlParserUtil deparser = new SqlParserUtil(
							expressionDeParser, buffer);
					deparser.setSchemaName(schemaName);
					expressionDeParser.setSelectVisitor(deparser);
					expressionDeParser.setBuffer(buffer);
					se.getSelectBody().accept(deparser);
 
 
					s.setSelectBody(se.getSelectBody());
					System.out.println();
				}
 
 
			}
 
 
			System.out.println(Statement.toString());
		} catch (JSQLParserException e) {
			e.printStackTrace();
		}
		return Statement.toString();
 
 
	}
 
 
	public static void main(String[] args) {
		// String sqlParserForInsert =
		// sqlParserForInsert("Insert into Table2 select  *  from Table1",
		// "two");
		String sqlParserForSelect = sqlParserForDelete(
				"delete from persp where id in (select p.user_id from per p left join test a on(a.id = b.id) inner join test t on(p.id = t.id) where t=1)",
				"xxm");
		System.out.println(sqlParserForSelect);
	}
}
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