Grails——Grails里面写SQL语句以及Oracle的分页

Oracle分页：

SELECT
    *
FROM
    (
        SELECT
            a1.*, ROWNUM rn
        FROM
            (
                SELECT
                    "t1".DATE_CREATED,
                    SUM ("t1".CHARGE_TIME) AS CHARGE_TIME,
                    SUM ("t1".CHARGING_CAPACITY) AS CHARGING_CAPACITY,
                    SUM ("t1".CHARGE_AMOUNT) AS CHARGE_AMOUNT,
                    MIN ("t1".PLATE_NUMBER) AS PLATE_NUMBER,
                    "t1".SELF_NUMBERING,
                    MIN ("t1".LINE) AS LINE,
                    MIN ("t1".FRAME_NUMBER) AS FRAME_NUMBER,
                    MIN ("t1".OWNER_NAME) AS OWNER_NAME
                FROM
                    CHARGEPILE.V_CHARGE_BUS "t1"
                WHERE
                    DATE_CREATED BETWEEN TO_DATE (
                        '2017-05-01',
                        'yyyy-mm-dd hh24:mi:ss'
                    )
                AND TO_DATE (
                    '2017-05-31',
                    'yyyy-mm-dd hh24:mi:ss'
                )
                GROUP BY
                    "t1".DATE_CREATED,
                    "t1".SELF_NUMBERING
                ORDER BY
                    MIN ("t1".OWNER_NAME) ASC,
                    MIN ("t1".LINE) ASC,
                    MIN ("t1".FRAME_NUMBER) ASC
            ) a1
        WHERE
            ROWNUM <= 15
    )
WHERE
    rn >= 1

Grails里面写SQL语句：

• 首先要知道需要在哪个数据源里面执行SQL，定义一个数据源

def dataSource

• 然后写两条SQL

 //查询数据的SQL
        StringBuffer sql = new StringBuffer()
        //用来分页查询数据条数的SQL
        StringBuffer count = new StringBuffer()
        //分页参数
        Integer max = params.max ? params.int("max") : 15
        Integer offset = params.offset ? params.int("offset") : 0
        offset = offset / max + 1
        if (offset == 0) {
            offset = 1
        }
        Integer initial = (max * offset) - max + 1
        Integer end = max * offset

         if (count.size() == 0) {
            count.append("SELECT\n" +
                    "\t\"COUNT\" (*)\n" +
                    "FROM\n" +
                    "\t(\n" +
                    "\t\tSELECT\n" +
                    "\t\t\t\"t1\".DATE_CREATED,\n" +
                    "\t\t\tSUM (\"t1\".CHARGE_TIME) AS CHARGE_TIME,\n" +
                    "\t\t\tSUM (\"t1\".CHARGING_CAPACITY) AS CHARGING_CAPACITY,\n" +
                    "\t\t\tSUM (\"t1\".CHARGE_AMOUNT) AS CHARGE_AMOUNT,\n" +
                    "\t\t\tMIN (\"t1\".PLATE_NUMBER) AS PLATE_NUMBER,\n" +
                    "\t\t\t\"t1\".SELF_NUMBERING,\n" +
                    "\t\t\tMIN (\"t1\".LINE) AS LINE,\n" +
                    "\t\t\tMIN (\"t1\".FRAME_NUMBER) AS FRAME_NUMBER,\n" +
                    "\t\t\tMIN (\"t1\".OWNER_NAME) AS OWNER_NAME\n" +
                    "\t\tFROM\n" +
                    "\t\t\tCHARGEPILE.V_CHARGE_BUS \"t1\"")

            if (params.createStart && params.createEnd) {
                count.append("WHERE\n" +
                        "\tDATE_CREATED BETWEEN TO_DATE (\n" +
                        "\t\t'" + params.createStart + "',\n" +
                        "\t\t'yyyy-mm-dd hh24:mi:ss'\n" +
                        "\t)\n" +
                        "AND TO_DATE (\n" +
                        "\t'" + params.createEnd + "',\n" +
                        "\t'yyyy-mm-dd hh24:mi:ss'\n" +
                        ")" + " ")
            }

            //运营商查询
            if (params.businessOwerName) {
                count.append("AND ENTERPRISE_CODE = '" + params.businessOwerName + "'" + " ")
            }

            //线路查询
            if (params.line) {
                count.append("AND line = '" + params.line + "'" + " ")
            }

            if (params.vehPlate) {
                count.append("AND PLATE_NUMBER='" + params.vehPlate + "'" + " ")
            }

            count.append("GROUP BY\n" +
                    "\t\t\t\"t1\".DATE_CREATED,\n" +
                    "\t\t\t\"t1\".SELF_NUMBERING\n" +
                    "\t)")
        }

        if (sql.size() == 0) {
            sql.append("SELECT\n" +
                    "\t*\n" +
                    "FROM\n" +
                    "\t(\n" +
                    "\t\tSELECT\n" +
                    "\t\t\ta1.*, ROWNUM rn\n" +
                    "\t\tFROM\n" +
                    "\t\t\t(\n" +
                    "\t\t\t\tSELECT\n" +
                    "\t\t\t\t\t\"t1\".DATE_CREATED,\n" +
                    "\t\t\t\t\tSUM (\"t1\".CHARGE_TIME) AS CHARGE_TIME,\n" +
                    "\t\t\t\t\tSUM (\"t1\".CHARGING_CAPACITY) AS CHARGING_CAPACITY,\n" +
                    "\t\t\t\t\tSUM (\"t1\".CHARGE_AMOUNT) AS CHARGE_AMOUNT,\n" +
                    "\t\t\t\t\tMIN (\"t1\".PLATE_NUMBER) AS PLATE_NUMBER,\n" +
                    "\t\t\t\t\t\"t1\".SELF_NUMBERING,\n" +
                    "\t\t\t\t\tMIN (\"t1\".LINE) AS LINE,\n" +
                    "\t\t\t\t\tMIN (\"t1\".FRAME_NUMBER) AS FRAME_NUMBER,\n" +
                    "\t\t\t\t\tMIN (\"t1\".OWNER_NAME) AS OWNER_NAME\n" +
                    "\t\t\t\tFROM\n" +
                    "\t\t\t\t\tCHARGEPILE.V_CHARGE_BUS \"t1\"")

            if (params.createStart && params.createEnd) {
                sql.append("WHERE\n" +
                        "\tDATE_CREATED BETWEEN TO_DATE (\n" +
                        "\t\t'" + params.createStart + "',\n" +
                        "\t\t'yyyy-mm-dd hh24:mi:ss'\n" +
                        "\t)\n" +
                        "AND TO_DATE (\n" +
                        "\t'" + params.createEnd + "',\n" +
                        "\t'yyyy-mm-dd hh24:mi:ss'\n" +
                        ")" + " ")
            }

            //运营商查询
            if (params.businessOwerName) {
                sql.append("AND ENTERPRISE_CODE = '" + params.businessOwerName + "'" + " ")
            }

            //线路查询
            if (params.line) {
                sql.append("AND line = '" + params.line + "'" + " ")
            }

            if (params.vehPlate) {
                sql.append("AND PLATE_NUMBER='" + params.vehPlate + "'" + " ")
            }

            sql.append("GROUP BY\n" +
                    "\t\t\t\t\t\"t1\".DATE_CREATED,\n" +
                    "\t\t\t\t\t\"t1\".SELF_NUMBERING\n" +
                    "ORDER BY\n" +
                    "Min(\"t1\".OWNER_NAME) ASC,\n" +
                    "Min(\"t1\".LINE) ASC,\n" +
                    "Min(\"t1\".FRAME_NUMBER) ASC"+
                    "\t\t\t) a1\n" +
                    "\t\tWHERE\n" +
                    "\t\t\tROWNUM <= " + end + "\n" +
                    "\t)\n" +
                    "WHERE\n" +
                    "\trn >=" + initial)
        }

• 最后就是执行SQL了

        def db = new groovy.sql.Sql(dataSource)
        List vehInfoList = db.rows(sql.toString())

        String str = db.firstRow(count.toString())
        Integer counts = str.substring(str.indexOf("=") + 1, str.indexOf("}")).toInteger()