This repository was archived by the owner on Mar 26, 2026. It is now read-only.
Repository navigation
Expand file tree
/
Copy pathreadSnippets.js
More file actions
188 lines (166 loc) · 4.94 KB
/
Copy pathreadSnippets.js
File metadata and controls
188 lines (166 loc) · 4.94 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';
async function main(
instanceId = 'YOUR_INSTANCE_ID',
tableId = 'YOUR_TABLE_ID',
readType = 'readRow',
) {
// [START bigtable_reads_print]
const {Bigtable} = require('@google-cloud/bigtable');
const bigtable = new Bigtable();
// TODO(developer): Uncomment these variables before running the sample
// const instanceId = 'YOUR_INSTANCE_ID';
// const tableId = 'YOUR_TABLE_ID';
const instance = bigtable.instance(instanceId);
const table = instance.table(tableId);
// Write your code here.
// [START_EXCLUDE]
switch (readType) {
case 'readRow': {
// [START bigtable_reads_row]
const rowkey = 'phone#4c410523#20190501';
const [row] = await table.row(rowkey).get();
printRow(rowkey, row.data);
// [END bigtable_reads_row]
break;
}
case 'readRowPartial': {
// [START bigtable_reads_row_partial]
const COLUMN_FAMILY = 'stats_summary';
const COLUMN_QUALIFIER = 'os_build';
const rowkey = 'phone#4c410523#20190501';
const [row] = await table
.row(rowkey)
.get([`${COLUMN_FAMILY}:${COLUMN_QUALIFIER}`]);
printRow(rowkey, row);
// [END bigtable_reads_row_partial]
break;
}
case 'readRows': {
// [START bigtable_reads_rows]
const rowKeys = ['phone#4c410523#20190501', 'phone#4c410523#20190502'];
const [rows] = await table.getRows({keys: rowKeys});
rows.forEach(row => printRow(row.id, row.data));
// [END bigtable_reads_rows]
break;
}
case 'readRowRange': {
// [START bigtable_reads_row_range]
const start = 'phone#4c410523#20190501';
const end = 'phone#4c410523#201906201';
await table
.createReadStream({
start,
end,
})
.on('error', err => {
// Handle the error.
console.log(err);
})
.on('data', row => printRow(row.id, row.data))
.on('end', () => {
// All rows retrieved.
});
// [END bigtable_reads_row_range]
break;
}
case 'readRowRanges': {
// [START bigtable_reads_row_ranges]
await table
.createReadStream({
ranges: [
{
start: 'phone#4c410523#20190501',
end: 'phone#4c410523#20190601',
},
{
start: 'phone#5c10102#20190501',
end: 'phone#5c10102#20190601',
},
],
})
.on('error', err => {
// Handle the error.
console.log(err);
})
.on('data', row => printRow(row.id, row.data))
.on('end', () => {
// All rows retrieved.
});
// [END bigtable_reads_row_ranges]
break;
}
case 'readPrefix': {
// [START bigtable_reads_prefix]
const prefix = 'phone#';
await table
.createReadStream({
prefix,
})
.on('error', err => {
// Handle the error.
console.log(err);
})
.on('data', row => printRow(row.id, row.data))
.on('end', () => {
// All rows retrieved.
});
// [END bigtable_reads_prefix]
break;
}
case 'readFilter': {
// [START bigtable_reads_filter]
const filter = {
value: /PQ2A.*$/,
};
await table
.createReadStream({
filter,
})
.on('error', err => {
// Handle the error.
console.log(err);
})
.on('data', row => printRow(row.id, row.data))
.on('end', () => {
// All rows retrieved.
});
// [END bigtable_reads_filter]
break;
}
}
// [END_EXCLUDE]
function printRow(rowkey, rowData) {
console.log(`Reading data for ${rowkey}:`);
for (const columnFamily of Object.keys(rowData)) {
const columnFamilyData = rowData[columnFamily];
console.log(`Column Family ${columnFamily}`);
for (const columnQualifier of Object.keys(columnFamilyData)) {
const col = columnFamilyData[columnQualifier];
for (const cell of col) {
const labels = cell.labels.length
? ` [${cell.labels.join(',')}]`
: '';
console.log(
`\t${columnQualifier}: ${cell.value} @${cell.timestamp}${labels}`,
);
}
}
}
console.log();
}
}
// [END bigtable_reads_print]
main(...process.argv.slice(2));