##实例代码

#!/bin/bash

cat ./switchsql.txt | while read line

do

tmp_partition_name=`echo $line | awk -F ' ' '{print $6}'`

if [[ "$tmp_partition_name" = "" ]]; then

continue

fi

start_flag=${tmp_partition_name:0:3}

date_flag=${tmp_partition_name:((${#tmp_partition_name} - 6))}

echo "${start_flag}${date_flag}" >> ./table_partition_date.txt

done

sort ./table_partition_date.txt | uniq > ./tpd_map.txt

rm ./table_partition_date.txt

declare -a partition_value_map=()

OUTFILE=`cat ./tpd_map.txt`

while read line

do

#业务数据后台查询，这里只模拟

part_flag="2"

partition_value="170724"

if [[ "$line" =~ "PD" ]]; then

partition_value="170718"

part_flag="1"

fi

if [[ "$line" =~ "PM" ]]; then

partition_value="170801"

part_flag="3"

fi

if [[ "$line" =~ "PY" ]]; then

partition_value="180717"

part_flag="4"

fi

date_flag=${line:((${#line} - 6))}

partition_value_map["${part_flag}${date_flag}"]="${partition_value}"

done <

$OUTFILE

EOF

get_partition_high_value(){

partition_name=$1

part_flag="2"

if [[ "$partition_name" =~ "PD" ]]; then

part_flag="1"

fi

if [[ "$partition_name" =~ "PM" ]]; then

part_flag="3"

fi

if [[ "$partition_name" =~ "PY" ]]; then

part_flag="4"

fi

date_flag=${partition_name:((${#partition_name} - 6))}

match_str="${part_flag}${date_flag}"

high_value=""

for key in ${!partition_value_map[@]}

do

if [ "$match_str" = "$key" ] ; then

high_value="${partition_value_map[$key]}"

break;

fi

done

echo $high_value

}

high_value=`get_partition_high_value "PD_IND_H_1234_170717"`

echo $high_value

high_value=`get_partition_high_value "PW_IND_H_1234_170717"`

echo $high_value

high_value=`get_partition_high_value "PM_IND_H_1234_170701"`

echo $high_value

##组织数据

alter table PM4H_DB.IND_M15_44 exchange partition PD_IND_M15_44_170717 with table PM4H_DB.PW_IND_M15_44_160704;

alter table PM4H_DB.IND_2D_33_1 exchange partition PW_IND_2D_33_1_170717 with table PM4H_DB.PW_IND_2D_33_1_160704;

alter table PM4H_DB.IND_2H_62_12 exchange partition PM_IND_2H_62_12_170701 with table PM4H_DB.PW_IND_2H_62_12_160704;

exit;

##运行结果

pm22:/netwatcher/dbbackup> sh map.sh

170718

170724

170801

总结

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