【组件】JAVA解析SQL语句jsqlparser
jsqlparser
依赖maven
com.github.jsqlparser
jsqlparser
4.3
public static void main(String[] args) throws Exception {
String sql = """
UPDATE
t1 q
SET q.name = '张三'
""";
// sql = """
//DELETE t1 FROM t1,t2 WHERE t1.id=t2.id
// """;
Statement parse = CCJSqlParserUtil.parse(sql);
//字典
Dict tableMap = new Dict();
Dict tableFullMap = new Dict();
Table table = null;
FromItem fromItem = null;
List joins = null;
List usingList = null;
Expression where = null;
if(parse instanceof Insert){
log.info("增");
Insert insert = (Insert) parse;
table = insert.getTable();
}else if(parse instanceof Delete){
log.info("删");
Delete delete = (Delete) parse;
table = delete.getTable();
joins = delete.getJoins();
usingList = delete.getUsingList();
where = delete.getWhere();
}else if(parse instanceof Update){
log.info("改");
Update update = (Update) parse;
table = update.getTable();
joins = update.getJoins();
fromItem = update.getFromItem();
where = update.getWhere();
}else if(parse instanceof Select){
log.info("查");
}
if(table != null){
log.info("表名:{}", table.getName());
if(table.getAlias() != null){
tableMap.set(table.getAlias().getName(), table.getName());
}else{
tableMap.set(table.getName(), table.getName());
}
tableFullMap.set(table.getName(), table);
}
if(fromItem != null){
Table fromItemTable = (Table) fromItem; // table.getAlias().getName(), table.getName()
log.info("fromItem表名:{}", fromItemTable.getName());
if(fromItemTable.getAlias() != null){
tableMap.set(fromItemTable.getAlias().getName(), fromItemTable.getName());
}else{
tableMap.set(fromItemTable.getName(), fromItemTable.getName());
}
tableFullMap.set(fromItemTable.getName(), fromItemTable);
}
/**
* 联查
*/
if(CollUtil.isNotEmpty(joins)){
for (Join join : joins) {
FromItem rightItem = join.getRightItem();
Table table2 = (Table) rightItem; // (table.getAlias().getName(), table.getName());
log.info("联查表:{}", table2.getName());
if(table2.getAlias() != null){
tableMap.set(table2.getAlias().getName(), table2.getName());
}else{
tableMap.set(table2.getName(), table2.getName());
}
tableFullMap.set(table2.getName(), table2);
// on 条件分析 //和where一样
Collection onExpressions = join.getOnExpressions();
for (Expression expression : onExpressions) {
// EqualsTo equalsTo = (EqualsTo) expression;
if (expression instanceof Column) {
Column rightColumn = (Column) expression;
log.info("联查条件 ON,表名:{}, 字段名:{}, 关联条件:{}", tableMap.get(rightColumn.getTable().toString()), rightColumn.getColumnName());
}
}
}
}
// where 分析
// where 只有两种情况，一种就是简单的a = b，另外就是 a = b or ... and， 这种就是AndExpression
if(where != null){
if (where instanceof EqualsTo) {
EqualsTo equalsTo = (EqualsTo) where;
Expression rightExpression = equalsTo.getRightExpression();
Expression leftExpression = equalsTo.getLeftExpression();
if (rightExpression instanceof Column) {
Column rightColumn = (Column) rightExpression;
log.info("条件 RIGHT,表名:{}, 字段名:{}, 值:{}", tableMap.get(rightColumn.getTable().toString()), rightColumn.getColumnName(), equalsTo.getRightExpression());
}
if (leftExpression instanceof Column) {
Column leftColumn = (Column) leftExpression;
log.info("条件 LEFT,表名:{}, 字段名:{}, 值:{}", tableMap.get(leftColumn.getTable().toString()), leftColumn.getColumnName(), equalsTo.getRightExpression());
}
}else if(where instanceof AndExpression){
AndExpression andExpression = (AndExpression) where;
Expression leftExpression = andExpression.getLeftExpression();
// doExpression(leftExpression);
Expression rightExpression = andExpression.getRightExpression();
// doExpression(rightExpression);
}
}
/**
* usingList
*/
if(CollUtil.isNotEmpty(usingList)){
for (Table table2 : usingList) {
if(table2.getAlias() != null){
tableMap.set(table2.getAlias().getName(), table2.getName());
}else{
tableMap.set(table2.getName(), table2.getName());
}
log.info("using表名:{}", table2.getName());
}
}
// System.out.println(parse);
//
// // 使用工具类把SQL转换为Select对象
// Select select = (Select) CCJSqlParserUtil.parse("""
// SELECT
// *
// FROM
// user u
// """);
//
// SelectBody selectBody = select.getSelectBody();
// PlainSelect plainSelect = (PlainSelect) selectBody;
}
工具
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.Dict;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.JSQLParserException;
import net.sf.jsqlparser.expression.Expression;
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.Select;
import net.sf.jsqlparser.statement.update.Update;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
@Slf4j
public class SqlUtil {
/**
* 通过sql 解析出涉及到的表
* @param sql
* @return
* @throws Exception
*/
public static Set getSqlTables(String sql) {
// String sql = """
// UPDATE
// user u
// SET u.name = '张三'
// """;
// sql = """
//DELETE t1 FROM t1,t2 WHERE t1.id=t2.id
// """;
Set tables = new HashSet<>();
Statement parse = null;
try {
parse = CCJSqlParserUtil.parse(sql);
} catch (JSQLParserException e) {
e.printStackTrace();
return tables;
}
//字典
Dict tableMap = new Dict();
Dict tableFullMap = new Dict();
Table table = null;
FromItem fromItem = null;
List joins = null;
List usingList = null;
Expression where = null;
if(parse instanceof Insert){
log.info("增");
Insert insert = (Insert) parse;
table = insert.getTable();
}else if(parse instanceof Delete){
log.info("删");
Delete delete = (Delete) parse;
table = delete.getTable();
joins = delete.getJoins();
usingList = delete.getUsingList();
where = delete.getWhere();
}else if(parse instanceof Update){
log.info("改");
Update update = (Update) parse;
table = update.getTable();
joins = update.getJoins();
fromItem = update.getFromItem();
where = update.getWhere();
}else if(parse instanceof Select){
// log.info("查");
}
if(table != null){
// log.info("表名:{}", table.getName());
// if(table.getAlias() != null){
// tableMap.set(table.getAlias().getName(), table.getName());
// }else{
// tableMap.set(table.getName(), table.getName());
// }
// tableFullMap.set(table.getName(), table);
tables.add(table.getName());
}
if(fromItem != null){
Table fromItemTable = (Table) fromItem; // table.getAlias().getName(), table.getName()
// log.info("fromItem表名:{}", fromItemTable.getName());
// if(fromItemTable.getAlias() != null){
// tableMap.set(fromItemTable.getAlias().getName(), fromItemTable.getName());
// }else{
// tableMap.set(fromItemTable.getName(), fromItemTable.getName());
// }
// tableFullMap.set(fromItemTable.getName(), fromItemTable);
tables.add(fromItemTable.getName());
}
/**
* 联查
*/
if(CollUtil.isNotEmpty(joins)){
for (Join join : joins) {
FromItem rightItem = join.getRightItem();
Table table2 = (Table) rightItem; // (table.getAlias().getName(), table.getName());
// log.info("联查表:{}", table2.getName());
// if(table2.getAlias() != null){
// tableMap.set(table2.getAlias().getName(), table2.getName());
// }else{
// tableMap.set(table2.getName(), table2.getName());
// }
// tableFullMap.set(table2.getName(), table2);
tables.add(table2.getName());
// on 条件分析 //和where一样
// Collection onExpressions = join.getOnExpressions();
// for (Expression expression : onExpressions) {
EqualsTo equalsTo = (EqualsTo) expression;
// if (expression instanceof Column) {
// Column rightColumn = (Column) expression;
// log.info("联查条件 ON,表名:{}, 字段名:{}, 关联条件:{}", tableMap.get(rightColumn.getTable().toString()), rightColumn.getColumnName());
// }
// }
}
}
// where 分析
// where 只有两种情况，一种就是简单的a = b，另外就是 a = b or ... and， 这种就是AndExpression
// if(where != null){
// if (where instanceof EqualsTo) {
// EqualsTo equalsTo = (EqualsTo) where;
// Expression rightExpression = equalsTo.getRightExpression();
// Expression leftExpression = equalsTo.getLeftExpression();
// if (rightExpression instanceof Column) {
// Column rightColumn = (Column) rightExpression;
// log.info("条件 RIGHT,表名:{}, 字段名:{}, 值:{}", tableMap.get(rightColumn.getTable().toString()), rightColumn.getColumnName(), equalsTo.getRightExpression());
// }
// if (leftExpression instanceof Column) {
// Column leftColumn = (Column) leftExpression;
// log.info("条件 LEFT,表名:{}, 字段名:{}, 值:{}", tableMap.get(leftColumn.getTable().toString()), leftColumn.getColumnName(), equalsTo.getRightExpression());
// }
// }else if(where instanceof AndExpression){
// AndExpression andExpression = (AndExpression) where;
// Expression leftExpression = andExpression.getLeftExpression();
doExpression(leftExpression);
// Expression rightExpression = andExpression.getRightExpression();
doExpression(rightExpression);
// }
// }
/**
* usingList
*/
if(CollUtil.isNotEmpty(usingList)){
for (Table table2 : usingList) {
// if(table2.getAlias() != null){
// tableMap.set(table2.getAlias().getName(), table2.getName());
// }else{
// tableMap.set(table2.getName(), table2.getName());
// }
// log.info("using表名:{}", table2.getName());
tables.add(table2.getName());
}
}
// System.out.println(parse);
//
// // 使用工具类把SQL转换为Select对象
// Select select = (Select) CCJSqlParserUtil.parse("""
// SELECT
// *
// FROM
// user u
// """);
//
// SelectBody selectBody = select.getSelectBody();
// PlainSelect plainSelect = (PlainSelect) selectBody;
return tables;
}
}
你可能感兴趣的:(技巧心得,java,sql,数据库)