Automating LOB Operations with DB2LobEditor: Scripts and Examples
Working with large objects (LOBs) in IBM DB2 can be tedious when done manually. DB2LobEditor simplifies LOB handling and can be scripted to automate repetitive tasks such as exporting, importing, updating, and validating LOB data. This guide shows practical scripts and examples to automate common LOB operations using DB2LobEditor together with DB2 command-line tools.
Prerequisites
- DB2LobEditor installed and configured.
- DB2 client or server access with appropriate privileges.
- Basic familiarity with shell scripting (bash) or Windows batch/PowerShell.
- A database table containing a LOB column (BLOB, CLOB, or DBCLOB).
Common tasks and automation patterns
Below are typical operations you’ll want to script: export LOBs to files, import LOBs from files, replace LOBs in rows, and validate integrity after operations.
1) Export LOBs to files (bulk)
Use a SQL query to list target rows, then call DB2LobEditor to export each LOB to a file.
Bash example:
bash
#!/bin/bash
DB=“MYDB”
TABLE=“MY_SCHEMA.MY_TABLE”
KEYCOL=“ID”
LOBCOL=“MY_LOB”
OUTDIR=”./lob_exports”
mkdir -p “\(OUTDIR</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span>db2 -x </span><span class="token" style="color: rgb(163, 21, 21);">"CONNECT TO </span><span class="token" style="color: rgb(54, 172, 170);">\)DB”
# Query IDs and file names
db2 -x “SELECT \(KEYCOL</span><span class="token" style="color: rgb(163, 21, 21);"> FROM </span><span class="token" style="color: rgb(54, 172, 170);">\)TABLE WHERE” | while read id; do
outfile=“\({OUTDIR}</span><span class="token" style="color: rgb(163, 21, 21);">/</span><span class="token" style="color: rgb(54, 172, 170);">\){TABLE##.}_\({id}</span><span class="token" style="color: rgb(163, 21, 21);">.lob"</span><span> </span><span> DB2LobEditor </span><span class="token builtin" style="color: rgb(43, 145, 175);">export</span><span> --database </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)DB” –table “\(TABLE</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> --keycol </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)KEYCOL” –keyval “\(id</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span class="token" style="color: rgb(57, 58, 52);"></span><span> </span><span> --lobcol </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)LOBCOL” –outfile “\(outfile</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">if</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">[</span><span> </span><span class="token" style="color: rgb(54, 172, 170);">\)? -ne 0 ]; then
echo “Export failed for ID \(id</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">></span><span class="token file-descriptor" style="color: rgb(238, 153, 0); font-weight: bold;">&2</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">else</span><span> </span><span> </span><span class="token builtin" style="color: rgb(43, 145, 175);">echo</span><span> </span><span class="token" style="color: rgb(163, 21, 21);">"Exported </span><span class="token" style="color: rgb(54, 172, 170);">\)id -> \(outfile</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">fi</span><span> </span><span></span><span class="token" style="color: rgb(0, 0, 255);">done</span><span> </span><span>db2 -x </span><span class="token" style="color: rgb(163, 21, 21);">"CONNECT RESET"</span><span> </span></code></div></div></pre> <p>Notes:</p> <ul> <li>Replace <your_condition> with a WHERE clause as needed.</li> <li>Adjust DB2LobEditor command-line flags to match your installed version.</li> </ul> <h3>2) Import LOBs from files (bulk)</h3> <p>Importing can mirror the export process. Match files to rows using a naming convention.</p> <p>Bash example:</p> <pre><div class="XG2rBS5V967VhGTCEN1k"><div class="nHykNMmtaaTJMjgzStID"><div class="HsT0RHFbNELC00WicOi8"><i><svg width="16" height="16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M15.434 7.51c.137.137.212.311.212.49a.694.694 0 0 1-.212.5l-3.54 3.5a.893.893 0 0 1-.277.18 1.024 1.024 0 0 1-.684.038.945.945 0 0 1-.302-.148.787.787 0 0 1-.213-.234.652.652 0 0 1-.045-.58.74.74 0 0 1 .175-.256l3.045-3-3.045-3a.69.69 0 0 1-.22-.55.723.723 0 0 1 .303-.52 1 1 0 0 1 .648-.186.962.962 0 0 1 .614.256l3.541 3.51Zm-12.281 0A.695.695 0 0 0 2.94 8a.694.694 0 0 0 .213.5l3.54 3.5a.893.893 0 0 0 .277.18 1.024 1.024 0 0 0 .684.038.945.945 0 0 0 .302-.148.788.788 0 0 0 .213-.234.651.651 0 0 0 .045-.58.74.74 0 0 0-.175-.256L4.994 8l3.045-3a.69.69 0 0 0 .22-.55.723.723 0 0 0-.303-.52 1 1 0 0 0-.648-.186.962.962 0 0 0-.615.256l-3.54 3.51Z"></path></svg></i><p class="li3asHIMe05JPmtJCytG wZ4JdaHxSAhGy1HoNVja cPy9QU4brI7VQXFNPEvF">bash</p></div><div class="CF2lgtGWtYUYmTULoX44"><button type="button" class="st68fcLUUT0dNcuLLB2_ ffON2NH02oMAcqyoh2UU MQCbz04ET5EljRmK3YpQ CPXAhl7VTkj2dHDyAYAf" data-copycode="true" role="button" aria-label="Copy Code"><svg viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill="currentColor" fill-rule="evenodd" clip-rule="evenodd" d="M9.975 1h.09a3.2 3.2 0 0 1 3.202 3.201v1.924a.754.754 0 0 1-.017.16l1.23 1.353A2 2 0 0 1 15 8.983V14a2 2 0 0 1-2 2H8a2 2 0 0 1-1.733-1H4.183a3.201 3.201 0 0 1-3.2-3.201V4.201a3.2 3.2 0 0 1 3.04-3.197A1.25 1.25 0 0 1 5.25 0h3.5c.604 0 1.109.43 1.225 1ZM4.249 2.5h-.066a1.7 1.7 0 0 0-1.7 1.701v7.598c0 .94.761 1.701 1.7 1.701H6V7a2 2 0 0 1 2-2h3.197c.195 0 .387.028.57.083v-.882A1.7 1.7 0 0 0 10.066 2.5H9.75c-.228.304-.591.5-1 .5h-3.5c-.41 0-.772-.196-1-.5ZM5 1.75v-.5A.25.25 0 0 1 5.25 1h3.5a.25.25 0 0 1 .25.25v.5a.25.25 0 0 1-.25.25h-3.5A.25.25 0 0 1 5 1.75ZM7.5 7a.5.5 0 0 1 .5-.5h3V9a1 1 0 0 0 1 1h1.5v4a.5.5 0 0 1-.5.5H8a.5.5 0 0 1-.5-.5V7Zm6 2v-.017a.5.5 0 0 0-.13-.336L12 7.14V9h1.5Z"></path></svg>Copy Code</button><button type="button" class="st68fcLUUT0dNcuLLB2_ WtfzoAXPoZC2mMqcexgL ffON2NH02oMAcqyoh2UU MQCbz04ET5EljRmK3YpQ GnLX_jUB3Jn3idluie7R"><svg fill="none" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path fill="currentColor" fill-rule="evenodd" d="M20.618 4.214a1 1 0 0 1 .168 1.404l-11 14a1 1 0 0 1-1.554.022l-5-6a1 1 0 0 1 1.536-1.28l4.21 5.05L19.213 4.382a1 1 0 0 1 1.404-.168Z" clip-rule="evenodd"></path></svg>Copied</button></div></div><div class="mtDfw7oSa1WexjXyzs9y" style="color: var(--sds-color-text-01); font-family: var(--sds-font-family-monospace); direction: ltr; text-align: left; white-space: pre; word-spacing: normal; word-break: normal; font-size: var(--sds-font-size-label); line-height: 1.2em; tab-size: 4; hyphens: none; padding: var(--sds-space-x02, 8px) var(--sds-space-x04, 16px) var(--sds-space-x04, 16px); margin: 0px; overflow: auto; border: none; background: transparent;"><code class="language-bash" style="color: rgb(57, 58, 52); font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace; direction: ltr; text-align: left; white-space: pre; word-spacing: normal; word-break: normal; font-size: 0.9em; line-height: 1.2em; tab-size: 4; hyphens: none;"><span class="token shebang" style="color: rgb(238, 153, 0); font-weight: bold;">#!/bin/bash</span><span> </span><span></span><span class="token assign-left" style="color: rgb(54, 172, 170);">DB</span><span class="token" style="color: rgb(57, 58, 52);">=</span><span class="token" style="color: rgb(163, 21, 21);">"MYDB"</span><span> </span><span></span><span class="token assign-left" style="color: rgb(54, 172, 170);">TABLE</span><span class="token" style="color: rgb(57, 58, 52);">=</span><span class="token" style="color: rgb(163, 21, 21);">"MY_SCHEMA.MY_TABLE"</span><span> </span><span></span><span class="token assign-left" style="color: rgb(54, 172, 170);">KEYCOL</span><span class="token" style="color: rgb(57, 58, 52);">=</span><span class="token" style="color: rgb(163, 21, 21);">"ID"</span><span> </span><span></span><span class="token assign-left" style="color: rgb(54, 172, 170);">LOBCOL</span><span class="token" style="color: rgb(57, 58, 52);">=</span><span class="token" style="color: rgb(163, 21, 21);">"MY_LOB"</span><span> </span><span></span><span class="token assign-left" style="color: rgb(54, 172, 170);">INDIR</span><span class="token" style="color: rgb(57, 58, 52);">=</span><span class="token" style="color: rgb(163, 21, 21);">"./lob_imports"</span><span> </span> <span>db2 -x </span><span class="token" style="color: rgb(163, 21, 21);">"CONNECT TO </span><span class="token" style="color: rgb(54, 172, 170);">\)DB”
for f in “$INDIR”/.lob; do
# assume filename pattern: MYTABLE.lob
id=\((</span><span class="token" style="color: rgb(57, 58, 52);">basename</span><span class="token" style="color: rgb(54, 172, 170);"> </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(163, 21, 21);">\)f“ | sed -E ’s/^[^.]+([0-9]+).lob\(//'</span><span class="token" style="color: rgb(54, 172, 170);">)</span><span> </span><span> DB2LobEditor </span><span class="token" style="color: rgb(57, 58, 52);">import</span><span> --database </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)DB” –table “\(TABLE</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> --keycol </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)KEYCOL” –keyval “\(id</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span class="token" style="color: rgb(57, 58, 52);"></span><span> </span><span> --lobcol </span><span class="token" style="color: rgb(163, 21, 21);">"</span><span class="token" style="color: rgb(54, 172, 170);">\)LOBCOL” –infile “\(f</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">if</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">[</span><span> </span><span class="token" style="color: rgb(54, 172, 170);">\)? -ne 0 ]; then
echo “Import failed for \(f</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span class="token" style="color: rgb(57, 58, 52);">></span><span class="token file-descriptor" style="color: rgb(238, 153, 0); font-weight: bold;">&2</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">else</span><span> </span><span> </span><span class="token builtin" style="color: rgb(43, 145, 175);">echo</span><span> </span><span class="token" style="color: rgb(163, 21, 21);">"Imported </span><span class="token" style="color: rgb(54, 172, 170);">\)f -> ID \(id</span><span class="token" style="color: rgb(163, 21, 21);">"</span><span> </span><span> </span><span class="token" style="color: rgb(0, 0, 255);">fi</span><span> </span><span></span><span class="token" style="color: rgb(0, 0, 255);">done</span><span> </span><span>db2 -x </span><span class="token" style="color: rgb(163, 21, 21);">"CONNECT RESET"</span><span> </span></code></div></div></pre> <h3>3) Replace LOB content for many rows (update from directory)</h3> <p>If you need to update multiple rows where each row’s LOB comes from a file, combine the above patterns and use transactions to ensure consistency.</p> <p>Bash with transaction control: ```bash db2 -x "CONNECT TO \)DB” db2 -x “BEGIN WORK” for f in “\(INDIR"/*.lob; do>(basename “$f” | sed -E ’s/^[^.]+([0-9]+).lob\(//') DB2LobEditor import --database "\)DB” –table “\(TABLE" --keycol "\)KEYCOL” –keyval “\(id" --lobcol "\)LOBCOL” –infile “\(f" [ \)? -neComments
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