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A set of utilities for Java
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package org.rx.jdbc;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.fastjson2.JSONObject;
import com.mysql.jdbc.MySQLConnection;
import com.mysql.jdbc.StringUtils;
import com.zaxxer.hikari.HikariDataSource;
import com.zaxxer.hikari.pool.ProxyConnection;
import lombok.NonNull;
import lombok.SneakyThrows;
import org.rx.core.*;
import org.rx.core.StringBuilder;
import org.rx.exception.InvalidException;
import org.rx.io.EntityQueryLambda;
import org.rx.third.guava.CaseFormat;
import org.rx.util.function.BiAction;
import org.rx.util.function.BiFunc;
import org.rx.util.function.TripleFunc;

import javax.sql.DataSource;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.sql.*;
import java.util.*;

import static org.rx.core.Extends.as;
import static org.rx.core.Sys.fromJson;
import static org.rx.core.Sys.toJsonObject;
import static org.rx.io.EntityQueryLambda.TO_UNDERSCORE_COLUMN_MAPPING;
import static org.rx.io.EntityQueryLambda.TO_UNDERSCORE_TABLE_MAPPING;

public class JdbcUtil {
    static final String HINT_PREFIX = "/*", HINT_SUFFIX = "*/";
    static final int HINT_PREFIX_AND_SUFFIX_LEN = HINT_PREFIX.length() + HINT_SUFFIX.length();
    static final String HINT_MAP_PAIR = ":", HINT_MAP_DELIMITER = ",";
    static final Linq TRANS_KEYWORDS = Linq.from("COMMIT", "ROLLBACK", "SAVEPOINT", "RELEASE");

    public static String appendHeadHint(String sql, Map headHints) {
        return appendHeadHint(sql, Linq.from(headHints.entrySet()).where(p -> p.getValue() != null).toJoinString(HINT_MAP_DELIMITER, p -> {
            String val = p.getValue().toString();
            if (Strings.containsAny(val, HINT_MAP_DELIMITER, HINT_MAP_PAIR)) {
                throw new InvalidException("Value can not contains ',' & ':'");
            }
            return p.getKey() + HINT_MAP_PAIR + val;
        }));
    }

    public static String appendHeadHint(String sql, String headHint) {
        return new StringBuilder(sql.length() + headHint.length() + HINT_PREFIX_AND_SUFFIX_LEN)
                .append(HINT_PREFIX).append(headHint).append(HINT_SUFFIX)
                .append(sql).toString();
    }

    public static Map getHeadHintAsMap(String sql) {
        String hint = getHeadHint(sql);
        if (Strings.isEmpty(hint)) {
            return Collections.emptyMap();
        }
        return Linq.from(Strings.split(hint, HINT_MAP_DELIMITER)).select(p -> {
            String[] pair = new String[2];
            int i = p.indexOf(HINT_MAP_PAIR);
            if (i == -1) {
                pair[0] = p;
                return pair;
            }
            pair[0] = p.substring(0, i);
            pair[1] = p.substring(i + 1);
            return pair;
        }).toMap(p -> p[0], p -> p[1]);
    }

    public static String getHeadHint(String sql) {
        sql = Strings.stripStart(sql, null);
        if (!Strings.startsWith(sql, HINT_PREFIX)) {
            return Strings.EMPTY;
        }
        int e = sql.indexOf(HINT_SUFFIX);
        if (e == -1) {
            return Strings.EMPTY;
        }
        return sql.substring(HINT_PREFIX.length(), e);
    }

    public static SqlStatementType getStatementType(String query) {
        String stripComments = StringUtils.stripComments(query, "'\"", "'\"", true, false, true, true);
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "SELECT")) {
            return SqlStatementType.SELECT;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "UPDATE")) {
            return SqlStatementType.UPDATE;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "INSERT")) {
            return SqlStatementType.INSERT;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "DELETE")) {
            return SqlStatementType.DELETE;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "SET")
                || TRANS_KEYWORDS.any(p -> StringUtils.startsWithIgnoreCaseAndWs(stripComments, p))) {
            return SqlStatementType.SET;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "USE")) {
            return SqlStatementType.USE;
        }
        if (StringUtils.startsWithIgnoreCaseAndWs(stripComments, "SHOW")) {
            return SqlStatementType.SHOW;
        }
        throw new InvalidException("Unknown statement type, {}", query);
//        return SqlStatementType.UPDATE;
    }

    public static String killCommand(Connection conn) {
        ProxyConnection as = as(conn, ProxyConnection.class);
        if (as != null) {
            conn = Reflects.readField(conn, "delegate");
        }
        return killCommand((MySQLConnection) conn);
    }

    @SneakyThrows
    public static String killCommand(MySQLConnection mysqlConn) {
        Long threadId = Reflects.readField(mysqlConn.getIO(), "threadId");
        return "KILL QUERY " + threadId;
    }

    public static DataSourceConfig getDataSourceConfig(DataSource ds) {
        if (ds instanceof HikariDataSource) {
            HikariDataSource hds = (HikariDataSource) ds;
            return new DataSourceConfig(hds.getJdbcUrl(), hds.getUsername(), hds.getPassword());
        }
        if (ds instanceof DruidDataSource) {
            DruidDataSource dhs = ((DruidDataSource) ds);
            return new DataSourceConfig(dhs.getUrl(), dhs.getUsername(), dhs.getPassword());
        }
        if (ds instanceof JdbcExecutor.DefaultDataSource) {
            return ((JdbcExecutor.DefaultDataSource) ds).config;
        }
        throw new UnsupportedOperationException(String.format("DataSource %s not support", ds.getClass()));
    }

    @SneakyThrows
    public static String getSqlTypeName(int sqlType) {
        for (Field field : Types.class.getFields()) {
            if (field.getInt(null) == sqlType) {
                return field.getName();
            }
        }
        return "VARCHAR";
    }

    public static int getSqlType(Object val) {
        if (val == null) {
            return Types.NULL;
        }

        if (val instanceof Boolean) {
            return Types.BOOLEAN;
        } else if (val instanceof Byte) {
            return Types.TINYINT;
        } else if (val instanceof Short) {
            return Types.SMALLINT;
        } else if (val instanceof Integer) {
            return Types.INTEGER;
        } else if (val instanceof Long) {
            return Types.BIGINT;
        } else if (val instanceof Float) {
            return Types.FLOAT;
        } else if (val instanceof Double) {
            return Types.DOUBLE;
        } else if (val instanceof Time) {
            return Types.TIME;
        } else if (val instanceof Timestamp) {
            return Types.TIMESTAMP;
        } else if (val instanceof BigDecimal) {
            return Types.DECIMAL;
        } else if (
//                val instanceof Date ||
                val instanceof java.util.Date) {
            return Types.DATE;
        } else if (val instanceof InputStream) {
            return Types.LONGVARBINARY;
        } else if (val instanceof Reader) {
            return Types.LONGVARCHAR;
        }
        return Types.VARCHAR;
    }

    @SneakyThrows
    public static void print(ResultSet resultSet) {
        try (ResultSet x = resultSet) {
            ResultSetMetaData metaData = x.getMetaData();
            for (int i = 1; i <= metaData.getColumnCount(); i++) {
                System.out.print(metaData.getColumnLabel(i) + "\t");
            }
            System.out.println();
            while (x.next()) {
                for (int i = 1; i <= metaData.getColumnCount(); i++) {
                    System.out.print(x.getObject(i) + "\t");
                }
                System.out.println();
            }
        }
    }

    public static final BiFunc TO_CAMEL_COLUMN_MAPPING = p -> CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, p);

    public static  List readAs(ResultSet resultSet, Type type) {
        return readAs(resultSet, type, TO_CAMEL_COLUMN_MAPPING, null);
    }

    @SneakyThrows
    public static  List readAs(@NonNull ResultSet resultSet, @NonNull Type type, BiFunc columnMapping, BiAction> rowMapping) {
        List list = new ArrayList<>();
        try (ResultSet rs = resultSet) {
            ResultSetMetaData metaData = rs.getMetaData();
            int colSize = metaData.getColumnCount();
            List columns = new ArrayList<>(colSize);
            if (columnMapping != null) {
                for (int i = 1; i <= colSize; i++) {
                    columns.add(columnMapping.invoke(metaData.getColumnLabel(i)));
                }
            } else {
                for (int i = 1; i <= colSize; i++) {
                    columns.add(metaData.getColumnLabel(i));
                }
            }

            JSONObject row = new JSONObject(colSize);
            while (rs.next()) {
                row.clear();
                for (int i = 0; i < colSize; ) {
                    row.put(columns.get(i), rs.getObject(++i));
                }
                if (rowMapping != null) {
                    rowMapping.invoke(row);
                }
                list.add(fromJson(row, type));
            }
        }
        return list;
    }

    public static  String buildInsertSql(T po) {
        return buildInsertSql(po, TO_UNDERSCORE_TABLE_MAPPING, TO_UNDERSCORE_COLUMN_MAPPING, null);
    }

    public static  String buildInsertSql(@NonNull T po, BiFunc, String> tableMapping, BiFunc columnMapping, TripleFunc valueMapping) {
        JSONObject row = toJsonObject(po);
        if (row.isEmpty()) {
            throw new InvalidException("Type {} hasn't any getters", po.getClass());
        }

        List columns = new ArrayList<>(row.size()), values = new ArrayList<>(row.size());
        if (columnMapping != null) {
            for (String k : row.keySet()) {
                String nk = columnMapping.apply(k);
                if (nk == null) {
                    continue;
                }
                columns.add("`" + nk + "`");
                Object val = row.get(k);
                if (valueMapping != null) {
                    val = valueMapping.apply(nk, val);
                }
                values.add(EntityQueryLambda.toValueString(val));
            }
        } else {
            for (String k : row.keySet()) {
                columns.add("`" + k + "`");
                Object val = row.get(k);
                if (valueMapping != null) {
                    val = valueMapping.apply(k, val);
                }
                values.add(EntityQueryLambda.toValueString(val));
            }
        }

        Class poType = po.getClass();
        return new StringBuilder(128)
                .appendMessageFormat(Constants.SQL_INSERT,
                        tableMapping != null ? tableMapping.apply(poType) : poType.getSimpleName(),
                        String.join(",", columns), String.join(",", values)).toString();
    }

    public static  String buildUpdateSql(T po, EntityQueryLambda query) {
        return buildUpdateSql(po, query, TO_UNDERSCORE_TABLE_MAPPING, TO_UNDERSCORE_COLUMN_MAPPING, null);
    }

    public static  String buildUpdateSql(@NonNull T po, @NonNull EntityQueryLambda query, BiFunc, String> tableMapping, BiFunc columnMapping, TripleFunc valueMapping) {
        JSONObject row = toJsonObject(po);
        if (row.isEmpty()) {
            throw new InvalidException("Type {} hasn't any getters", po.getClass());
        }
        query.setColumnMapping(columnMapping);

        List colVals = new ArrayList<>(row.size());
        if (columnMapping != null) {
            for (String k : row.keySet()) {
                String nk = columnMapping.apply(k);
                if (nk == null) {
                    continue;
                }
                Object val = row.get(k);
                if (valueMapping != null) {
                    val = valueMapping.apply(nk, val);
                }
                colVals.add("`" + nk + "`=" + EntityQueryLambda.toValueString(val));
            }
        } else {
            for (String k : row.keySet()) {
                Object val = row.get(k);
                if (valueMapping != null) {
                    val = valueMapping.apply(k, val);
                }
                colVals.add("`" + k + "`=" + EntityQueryLambda.toValueString(val));
            }
        }

        Class poType = po.getClass();
        return new StringBuilder(128)
                .appendMessageFormat(Constants.SQL_UPDATE, tableMapping != null ? tableMapping.apply(poType) : poType.getSimpleName(),
                        String.join(",", colVals))
                .append(query).toString();
    }
}